# OpcNodeManager Members > Reference: Provides an abstract base class used to organize and maintain the address space or only a part of it.
Type
OpcNodeManager
Namespace
Opc.UaFx.Server
Assembly
Opc.UaFx.Advanced.dll
Package
Opc.UaFx.Advanced v2.59.0
## Constructors ### OpcNodeManager protected · 3 overloads | Overload | Description | |---|---| | [OpcNodeManager(OpcNamespace, params OpcNamespace\[\])](#opcnodemanager-opc-uafx-opcnamespace-opc-uafx-opcnamespace-array)protected · since v2.8 | Initializes a new instance of the [OpcNodeManager](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodemanager/) class using the `defaultNamespace` and additionally specified `namespaces`. | | [OpcNodeManager(string, params string\[\])](#opcnodemanager-system-string-system-string-array)protected | Initializes a new instance of the [OpcNodeManager](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodemanager/) class using the `defaultNamespace` and additionally specified [string](https://learn.microsoft.com/dotnet/api/system.string)-based `namespaces`. | | [OpcNodeManager(Uri, params Uri\[\])](#opcnodemanager-system-uri-system-uri-array)protected | Initializes a new instance of the [OpcNodeManager](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodemanager/) class using the `defaultNamespaceUri` and additionally specified [Uri](https://learn.microsoft.com/dotnet/api/system.uri)-based `namespaceUris`. | #### OpcNodeManager(OpcNamespace, params OpcNamespace\[\]) protected · since v2.8 Initializes a new instance of the [OpcNodeManager](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodemanager/) class using the `defaultNamespace` and additionally specified `namespaces`.
```csharp protected OpcNodeManager( OpcNamespace defaultNamespace, params OpcNamespace[] namespaces) ```
```vbnet Protected Sub New( defaultNamespace As OpcNamespace, ParamArray namespaces As OpcNamespace()) ```
**Parameters** | Name | Type | Description | |---|---|---| | `defaultNamespace` | [OpcNamespace](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnamespace/) | The default [OpcNamespace](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnamespace/) used for the [DefaultNamespace](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodemanager/members#defaultnamespace) property. In case there [AssignDefaultNamespaceOfManager](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcautomatism/members#assigndefaultnamespaceofmanager) is equals true (the default value) the [Name](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnode/members#name) and [Id](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnode/members#id) of the [OpcNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnode/) instances defined are linked to this namespace in case there is no namespace information associated to them. | | `namespaces` | params [OpcNamespace](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnamespace/)[] | An array of [OpcNamespace](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnamespace/) instances indicating which namespaces are as well maintained by the new [OpcNodeManager](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodemanager/). The instances can then found in the [Namespaces](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodemanager/members#namespaces) property as well. | **Exceptions** | Exception | Condition | |---|---| | [ArgumentException](https://learn.microsoft.com/dotnet/api/system.argumentexception) | The `defaultNamespace` or one of the items in `namespaces` refers to a namespace which presets a namespace index. The according namespace index is determined by the server. | | [ArgumentNullException](https://learn.microsoft.com/dotnet/api/system.argumentnullexception) | The `defaultNamespace` or one of the items in `namespaces` is a null reference (Nothing in Visual Basic). | #### OpcNodeManager(string, params string\[\]) protected Initializes a new instance of the [OpcNodeManager](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodemanager/) class using the `defaultNamespace` and additionally specified [string](https://learn.microsoft.com/dotnet/api/system.string)-based `namespaces`.
```csharp protected OpcNodeManager(string defaultNamespace, params string[] namespaces) ```
```vbnet Protected Sub New(defaultNamespace As String, ParamArray namespaces As String()) ```
**Parameters** | Name | Type | Description | |---|---|---| | `defaultNamespace` | [String](https://learn.microsoft.com/dotnet/api/system.string) | The [string](https://learn.microsoft.com/dotnet/api/system.string) representation of the default [OpcNamespace](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnamespace/) which is used for the [DefaultNamespace](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodemanager/members#defaultnamespace) property. In case there [AssignDefaultNamespaceOfManager](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcautomatism/members#assigndefaultnamespaceofmanager) is equals true (the default value) the [Name](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnode/members#name) and [Id](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnode/members#id) of the [OpcNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnode/) instances defined are linked to this namespace in case there is no namespace information associated to them. | | `namespaces` | params [String](https://learn.microsoft.com/dotnet/api/system.string)[] | An array of [string](https://learn.microsoft.com/dotnet/api/system.string) representations of the [OpcNamespace](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnamespace/) indicating which namespaces are as well maintained by the new [OpcNodeManager](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodemanager/). The used [OpcNamespace](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnamespace/) instances can be found in the [Namespaces](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodemanager/members#namespaces) property as well. | **Exceptions** | Exception | Condition | |---|---| | [ArgumentException](https://learn.microsoft.com/dotnet/api/system.argumentexception) | The `defaultNamespace` or one of the items in `namespaces` is an empty string. | | [ArgumentNullException](https://learn.microsoft.com/dotnet/api/system.argumentnullexception) | The `defaultNamespace` or one of the items in `namespaces` is a null reference (Nothing in Visual Basic). | #### OpcNodeManager(Uri, params Uri\[\]) protected Initializes a new instance of the [OpcNodeManager](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodemanager/) class using the `defaultNamespaceUri` and additionally specified [Uri](https://learn.microsoft.com/dotnet/api/system.uri)-based `namespaceUris`.
```csharp protected OpcNodeManager(Uri defaultNamespaceUri, params Uri[] namespaceUris) ```
```vbnet Protected Sub New(defaultNamespaceUri As Uri, ParamArray namespaceUris As Uri()) ```
**Parameters** | Name | Type | Description | |---|---|---| | `defaultNamespaceUri` | [Uri](https://learn.microsoft.com/dotnet/api/system.uri) | The [Uri](https://learn.microsoft.com/dotnet/api/system.uri) representation of the default [OpcNamespace](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnamespace/) which is used for the [DefaultNamespace](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodemanager/members#defaultnamespace) property. In case there [AssignDefaultNamespaceOfManager](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcautomatism/members#assigndefaultnamespaceofmanager) is equals true (the default value) the [Name](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnode/members#name) and [Id](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnode/members#id) of the [OpcNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnode/) instances defined are linked to this namespace in case there is no namespace information associated to them. | | `namespaceUris` | params [Uri](https://learn.microsoft.com/dotnet/api/system.uri)[] | An array of [Uri](https://learn.microsoft.com/dotnet/api/system.uri) representations of the [OpcNamespace](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnamespace/) indicating which namespaces are as well maintained by the new [OpcNodeManager](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodemanager/). The used [OpcNamespace](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnamespace/) instances can be found in the [Namespaces](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodemanager/members#namespaces) property as well. | **Exceptions** | Exception | Condition | |---|---| | [ArgumentNullException](https://learn.microsoft.com/dotnet/api/system.argumentnullexception) | The `defaultNamespaceUri` or one of the items in `namespaceUris` is a null reference (Nothing in Visual Basic). | ## Properties ### DefaultNamespace Gets the default namespace of the node manager.
```csharp public OpcNamespace DefaultNamespace { get; } ```
```vbnet Public ReadOnly Property DefaultNamespace As OpcNamespace ```
**Property value** [OpcNamespace](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnamespace/) The [OpcNamespace](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnamespace/) specified as the default namespace when the node manager was created. When the server is started, the instance is replaced by the namespace the server has registered for it. ### DefaultNamespaceIndex Gets the index of the default namespace of the node manager.
```csharp public int DefaultNamespaceIndex { get; } ```
```vbnet Public ReadOnly Property DefaultNamespaceIndex As Integer ```
**Property value** [Int32](https://learn.microsoft.com/dotnet/api/system.int32) The [Index](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnamespace/members#index) of the [DefaultNamespace](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodemanager/members#defaultnamespace), which the server assigns when it is started. ### DefaultNamespaceUri Gets the URI of the default namespace of the node manager.
```csharp public Uri DefaultNamespaceUri { get; } ```
```vbnet Public ReadOnly Property DefaultNamespaceUri As Uri ```
**Property value** [Uri](https://learn.microsoft.com/dotnet/api/system.uri) The [Uri](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnamespace/members#uri) of the [DefaultNamespace](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodemanager/members#defaultnamespace). ### DefaultNamespaceValue since v2.8 Gets the textual value of the default namespace of the node manager.
```csharp public string DefaultNamespaceValue { get; } ```
```vbnet Public ReadOnly Property DefaultNamespaceValue As String ```
**Property value** [String](https://learn.microsoft.com/dotnet/api/system.string) The [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnamespace/members#value) of the [DefaultNamespace](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodemanager/members#defaultnamespace). ### Namespaces since v2.8 Gets the namespaces maintained by the node manager.
```csharp public OpcReadOnlyNamespaceCollection Namespaces { get; } ```
```vbnet Public ReadOnly Property Namespaces As OpcReadOnlyNamespaceCollection ```
**Property value** [OpcReadOnlyNamespaceCollection](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcreadonlynamespacecollection/) An [OpcReadOnlyNamespaceCollection](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcreadonlynamespacecollection/) which starts with the [DefaultNamespace](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodemanager/members#defaultnamespace), followed by the further namespaces specified when the node manager was created, without duplicates. ### NodeIdFactory protected · virtual Gets or sets the [OpcNodeIdFactory](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeidfactory/) instance used by this node manager to determine / create node identifiers for the nodes provided / defined by the node manager.
```csharp protected virtual OpcNodeIdFactory NodeIdFactory { get; set; } ```
```vbnet Protected Overridable Property NodeIdFactory As OpcNodeIdFactory ```
**Property value** [OpcNodeIdFactory](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeidfactory/) An instance of the [OpcNodeIdFactory](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeidfactory/) class. In case there is no custom [OpcNodeIdFactory](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeidfactory/) defined. The [Factory](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeid/members#factory) is used. ### Nodes Gets the nodes of the node manager.
```csharp public OpcReadOnlyNodeCollection Nodes { get; } ```
```vbnet Public ReadOnly Property Nodes As OpcReadOnlyNodeCollection ```
**Property value** [OpcReadOnlyNodeCollection](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcreadonlynodecollection/) An [OpcReadOnlyNodeCollection](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcreadonlynodecollection/) with the nodes of the address space part maintained by the node manager; an empty collection until the server has created the address space. ### NodeSetImportOptions protected · virtual · since v2.50 Gets or sets the options to use to import the node sets provided by [ImportNodes](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodemanager/members#importnodes).
```csharp protected virtual OpcNodeSetImportOptions NodeSetImportOptions { get; set; } ```
```vbnet Protected Overridable Property NodeSetImportOptions As OpcNodeSetImportOptions ```
**Property value** [OpcNodeSetImportOptions](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodesetimportoptions/) A combination of the [OpcNodeSetImportOptions](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodesetimportoptions/) flags. The default value is [None](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodesetimportoptions/#none). **Remarks** The flags [CompleteDataTypeDefinitionFields](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodesetimportoptions/#completedatatypedefinitionfields) and [CompleteDataTypeDefinitionDefaultEncoding](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodesetimportoptions/#completedatatypedefinitiondefaultencoding) apply to the data types of all node managers of the server as soon as one node manager sets them. ### NotifierNodes Gets the nodes of the node manager which act as notifiers (event sources) of the 'Server' node.
```csharp public OpcReadOnlyNodeCollection NotifierNodes { get; } ```
```vbnet Public ReadOnly Property NotifierNodes As OpcReadOnlyNodeCollection ```
**Property value** [OpcReadOnlyNodeCollection](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcreadonlynodecollection/) An [OpcReadOnlyNodeCollection](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcreadonlynodecollection/) with the notifier nodes; an empty collection until the server has created the address space. ### SyncRoot protected Gets the object the node manager locks while it notifies monitored items about changes of its nodes and while it creates, modifies or deletes monitored items, browses, translates browse paths or accesses the history of its nodes.
```csharp protected object SyncRoot { get; } ```
```vbnet Protected ReadOnly Property SyncRoot As Object ```
**Property value** [Object](https://learn.microsoft.com/dotnet/api/system.object) The lock of this node manager. Every node manager has a lock of its own. **Remarks** The SDK does not synchronize changes of nodes. A value set, [ApplyChanges](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnode/members#applychanges-opc-uafx-opccontext-system-boolean) and [ReportEvent](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opceventnode/members#reportevent) can be called from any thread, but changes of the same node from several threads at once can lose a notification or report a torn state. Holding this lock while changing and applying changes serializes them with other code holding it and with the notification of monitored items. It does not serialize them with the Read and Write services of clients, which only lock the node accessed, nor with method calls, which run without this lock. The notification of monitored items and the creation of monitored items call read callbacks and the monitored item events with this lock held. Such code must not wait for another thread that holds the lock of a different node manager and reports an event, because an event takes the lock of the node manager of every notifier it passes. The lock is not public, because holding it outside of the node manager would not make changes atomic to clients either. Code that changes several nodes together therefore belongs into a method of the node manager, which can hold this lock. ### SystemContext protected Gets the context which the node manager uses to access its nodes.
```csharp protected OpcContext SystemContext { get; } ```
```vbnet Protected ReadOnly Property SystemContext As OpcContext ```
**Property value** [OpcContext](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opccontext/) The [OpcContext](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opccontext/) of the server for the node manager; a null reference (Nothing in Visual Basic) until the server using the node manager has been started. ### UseAsyncMethodCalls protected · virtual · since v2.24 Gets a value indicating whether every call to a [OpcMethodNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcmethodnode/) defined by the current [OpcNodeManager](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodemanager/) is to be processed asynchronously using one worker thread per method call.
```csharp protected virtual bool UseAsyncMethodCalls { get; } ```
```vbnet Protected Overridable ReadOnly Property UseAsyncMethodCalls As Boolean ```
**Property value** [Boolean](https://learn.microsoft.com/dotnet/api/system.boolean) The value true if every method call (which belongs to [OpcMethodNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcmethodnode/) objects defined by the current [OpcNodeManager](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodemanager/)) is to be processed parallel to each other; otherwise the value false to process method calls in their sequence. The default value is false. **Remarks** This behavior can be controlled by each node manager on its own. Just override the [UseAsyncMethodCalls](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodemanager/members#useasyncmethodcalls) property and provide the value true in the node managers which shall process method calls in parallel. Every [OpcMethodNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcmethodnode/) defined with a delegate to a method its return value provides a [Task](https://learn.microsoft.com/dotnet/api/system.threading.tasks.task) is already processed in parallel. Use the [UseAsyncMethodCalls](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcautomatism/members#useasyncmethodcalls) property to control this behavior for every node manager used. ## Methods ### AddNode 8 overloads | Overload | Description | |---|---| | [AddNode(IOpcNode)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodemanager/members#addnode-opc-uafx-iopcnode) | Adds the `node` specified to the address space of the node manager. | | [AddNode(OpcContext, IOpcNode)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodemanager/members#addnode-opc-uafx-opccontext-opc-uafx-iopcnode)since v2.7 | Adds the `node` specified to the address space of the node manager using the `context` specified. | | [AddNode(IOpcNode, IEnumerable<IOpcNodeReferenceAware>)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodemanager/members#addnode-opc-uafx-iopcnode-system-collections-generic-ienumerable-of-opc-uafx-iopcnodereferenceaware)protected · since v2.7 | Adds the `node` specified to the address space of the node manager using the `references` specified. | | [AddNode(IOpcNode, params IOpcNodeReferenceAware\[\])](#addnode-opc-uafx-iopcnode-opc-uafx-iopcnodereferenceaware-array)protected · since v2.7 | Adds the `node` specified to the address space of the node manager using the `references` specified. | | [AddNode(IOpcNode, OpcNodeReferenceCollection)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodemanager/members#addnode-opc-uafx-iopcnode-opc-uafx-opcnodereferencecollection)protected · since v2.7 | Adds the `node` specified to the address space of the node manager using the `references` specified. | | [AddNode(OpcContext, IOpcNode, IEnumerable<IOpcNodeReferenceAware>)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodemanager/members#addnode-opc-uafx-opccontext-opc-uafx-iopcnode-system-collections-generic-ienumerable-of-opc-uafx-iopcnodereferenceaware)protected · virtual · since v2.7 | Adds the `node` specified to the address space of the node manager using the `context` and `references` specified. | | [AddNode(OpcContext, IOpcNode, params IOpcNodeReferenceAware\[\])](#addnode-opc-uafx-opccontext-opc-uafx-iopcnode-opc-uafx-iopcnodereferenceaware-array)protected · since v2.7 | Adds the `node` specified to the address space of the node manager using the `context` and `references` specified. | | [AddNode(OpcContext, IOpcNode, OpcNodeReferenceCollection)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodemanager/members#addnode-opc-uafx-opccontext-opc-uafx-iopcnode-opc-uafx-opcnodereferencecollection)protected · virtual · since v2.7 | Adds the `node` specified to the address space of the node manager using the `context` and `references` specified. | **Exceptions (all overloads)** | Exception | Condition | |---|---| | [InvalidOperationException](https://learn.microsoft.com/dotnet/api/system.invalidoperationexception) | The server using the node manager has not yet been started. | #### AddNode(IOpcNode) Adds the `node` specified to the address space of the node manager.
```csharp public void AddNode(IOpcNode node) ```
```vbnet Public Sub AddNode(node As IOpcNode) ```
**Parameters** | Name | Type | Description | |---|---|---| | `node` | [IOpcNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcnode/) | The [IOpcNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcnode/) to add. | **Exceptions** | Exception | Condition | |---|---| | [ArgumentNullException](https://learn.microsoft.com/dotnet/api/system.argumentnullexception) | The `node` is a null reference (Nothing in Visual Basic). | **Remarks** A node which is already part of the address space is not added again. #### AddNode(OpcContext, IOpcNode) since v2.7 Adds the `node` specified to the address space of the node manager using the `context` specified.
```csharp public void AddNode(OpcContext context, IOpcNode node) ```
```vbnet Public Sub AddNode(context As OpcContext, node As IOpcNode) ```
**Parameters** | Name | Type | Description | |---|---|---| | `context` | [OpcContext](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opccontext/) | The [OpcContext](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opccontext/) to use to add the node. | | `node` | [IOpcNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcnode/) | The [IOpcNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcnode/) to add. | **Exceptions** | Exception | Condition | |---|---| | [ArgumentNullException](https://learn.microsoft.com/dotnet/api/system.argumentnullexception) | The `context` or `node` is a null reference (Nothing in Visual Basic). | **Remarks** A node which is already part of the address space is not added again. #### AddNode(IOpcNode, IEnumerable<IOpcNodeReferenceAware>) protected · since v2.7 Adds the `node` specified to the address space of the node manager using the `references` specified.
```csharp protected void AddNode( IOpcNode node, IEnumerable references) ```
```vbnet Protected Sub AddNode( node As IOpcNode, references As IEnumerable(Of IOpcNodeReferenceAware)) ```
**Parameters** | Name | Type | Description | |---|---|---| | `node` | [IOpcNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcnode/) | The [IOpcNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcnode/) to add. | | `references` | [IEnumerable](https://learn.microsoft.com/dotnet/api/system.collections.generic.ienumerable-1)<[IOpcNodeReferenceAware](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcnodereferenceaware/)> | A sequence of [IOpcNodeReferenceAware](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcnodereferenceaware/) instances which define the references of the node to further nodes. | **Exceptions** | Exception | Condition | |---|---| | [ArgumentNullException](https://learn.microsoft.com/dotnet/api/system.argumentnullexception) | The `node` or `references` is a null reference (Nothing in Visual Basic). | **Remarks** A node which is already part of the address space is not added again. #### AddNode(IOpcNode, params IOpcNodeReferenceAware\[\]) protected · since v2.7 Adds the `node` specified to the address space of the node manager using the `references` specified.
```csharp protected void AddNode( IOpcNode node, params IOpcNodeReferenceAware[] references) ```
```vbnet Protected Sub AddNode( node As IOpcNode, ParamArray references As IOpcNodeReferenceAware()) ```
**Parameters** | Name | Type | Description | |---|---|---| | `node` | [IOpcNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcnode/) | The [IOpcNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcnode/) to add. | | `references` | params [IOpcNodeReferenceAware](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcnodereferenceaware/)[] | An array of [IOpcNodeReferenceAware](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcnodereferenceaware/) instances which define the references of the node to further nodes. | **Exceptions** | Exception | Condition | |---|---| | [ArgumentNullException](https://learn.microsoft.com/dotnet/api/system.argumentnullexception) | The `node` or `references` is a null reference (Nothing in Visual Basic). | **Remarks** A node which is already part of the address space is not added again. #### AddNode(IOpcNode, OpcNodeReferenceCollection) protected · since v2.7 Adds the `node` specified to the address space of the node manager using the `references` specified.
```csharp protected void AddNode(IOpcNode node, OpcNodeReferenceCollection references) ```
```vbnet Protected Sub AddNode( node As IOpcNode, references As OpcNodeReferenceCollection) ```
**Parameters** | Name | Type | Description | |---|---|---| | `node` | [IOpcNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcnode/) | The [IOpcNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcnode/) to add. | | `references` | [OpcNodeReferenceCollection](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodereferencecollection/) | The [OpcNodeReferenceCollection](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodereferencecollection/) which defines the references of the node to further nodes. | **Exceptions** | Exception | Condition | |---|---| | [ArgumentNullException](https://learn.microsoft.com/dotnet/api/system.argumentnullexception) | The `node` or `references` is a null reference (Nothing in Visual Basic). | **Remarks** A node which is already part of the address space is not added again. #### AddNode(OpcContext, IOpcNode, IEnumerable<IOpcNodeReferenceAware>) protected · virtual · since v2.7 Adds the `node` specified to the address space of the node manager using the `context` and `references` specified.
```csharp protected virtual void AddNode( OpcContext context, IOpcNode node, IEnumerable references) ```
```vbnet Protected Overridable Sub AddNode( context As OpcContext, node As IOpcNode, references As IEnumerable(Of IOpcNodeReferenceAware)) ```
**Parameters** | Name | Type | Description | |---|---|---| | `context` | [OpcContext](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opccontext/) | The [OpcContext](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opccontext/) to use to add the node. | | `node` | [IOpcNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcnode/) | The [IOpcNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcnode/) to add. | | `references` | [IEnumerable](https://learn.microsoft.com/dotnet/api/system.collections.generic.ienumerable-1)<[IOpcNodeReferenceAware](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcnodereferenceaware/)> | A sequence of [IOpcNodeReferenceAware](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcnodereferenceaware/) instances which define the references of the node to further nodes. | **Exceptions** | Exception | Condition | |---|---| | [ArgumentNullException](https://learn.microsoft.com/dotnet/api/system.argumentnullexception) | The `context`, `node` or `references` is a null reference (Nothing in Visual Basic). | **Remarks** A node which is already part of the address space is not added again. #### AddNode(OpcContext, IOpcNode, params IOpcNodeReferenceAware\[\]) protected · since v2.7 Adds the `node` specified to the address space of the node manager using the `context` and `references` specified.
```csharp protected void AddNode( OpcContext context, IOpcNode node, params IOpcNodeReferenceAware[] references) ```
```vbnet Protected Sub AddNode( context As OpcContext, node As IOpcNode, ParamArray references As IOpcNodeReferenceAware()) ```
**Parameters** | Name | Type | Description | |---|---|---| | `context` | [OpcContext](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opccontext/) | The [OpcContext](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opccontext/) to use to add the node. | | `node` | [IOpcNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcnode/) | The [IOpcNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcnode/) to add. | | `references` | params [IOpcNodeReferenceAware](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcnodereferenceaware/)[] | An array of [IOpcNodeReferenceAware](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcnodereferenceaware/) instances which define the references of the node to further nodes. | **Exceptions** | Exception | Condition | |---|---| | [ArgumentNullException](https://learn.microsoft.com/dotnet/api/system.argumentnullexception) | The `context`, `node` or `references` is a null reference (Nothing in Visual Basic). | **Remarks** A node which is already part of the address space is not added again. #### AddNode(OpcContext, IOpcNode, OpcNodeReferenceCollection) protected · virtual · since v2.7 Adds the `node` specified to the address space of the node manager using the `context` and `references` specified.
```csharp protected virtual void AddNode( OpcContext context, IOpcNode node, OpcNodeReferenceCollection references) ```
```vbnet Protected Overridable Sub AddNode( context As OpcContext, node As IOpcNode, references As OpcNodeReferenceCollection) ```
**Parameters** | Name | Type | Description | |---|---|---| | `context` | [OpcContext](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opccontext/) | The [OpcContext](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opccontext/) to use to add the node. | | `node` | [IOpcNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcnode/) | The [IOpcNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcnode/) to add. | | `references` | [OpcNodeReferenceCollection](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodereferencecollection/) | The [OpcNodeReferenceCollection](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodereferencecollection/) which defines the references of the node to further nodes. | **Exceptions** | Exception | Condition | |---|---| | [ArgumentNullException](https://learn.microsoft.com/dotnet/api/system.argumentnullexception) | The `context`, `node` or `references` is a null reference (Nothing in Visual Basic). | **Remarks** A node which is already part of the address space is not added again. ### AddNotifierNode protected Adds the `node` to the collection of 'root' notifiers (= event sources) of the 'Server' node.
```csharp protected void AddNotifierNode(IOpcNode node) ```
```vbnet Protected Sub AddNotifierNode(node As IOpcNode) ```
**Parameters** | Name | Type | Description | |---|---|---| | `node` | [IOpcNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcnode/) | The [IOpcNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcnode/) instance acting as the notifier of the 'Server' node. | **Exceptions** | Exception | Condition | |---|---| | [ArgumentNullException](https://learn.microsoft.com/dotnet/api/system.argumentnullexception) | The `node` is a null reference (Nothing in Visual Basic). | | [InvalidOperationException](https://learn.microsoft.com/dotnet/api/system.invalidoperationexception) | The master node has not yet been created, therefore the operation is at the moment not available. | ### Browse protected · virtual · since v2.7 Browses the references of a node of the node manager on behalf of a client.
```csharp protected virtual OpcBrowsePoint Browse( OpcContext context, OpcBrowsePoint browsePoint, OpcReferenceDescriptionCollection references) ```
```vbnet Protected Overridable Function Browse( context As OpcContext, browsePoint As OpcBrowsePoint, references As OpcReferenceDescriptionCollection) As OpcBrowsePoint ```
**Parameters** | Name | Type | Description | |---|---|---| | `context` | [OpcContext](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opccontext/) | The [OpcContext](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opccontext/) of the browse operation. | | `browsePoint` | [OpcBrowsePoint](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcbrowsepoint/) | The [OpcBrowsePoint](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcbrowsepoint/) which describes the node and the references to browse and the position to continue at. | | `references` | [OpcReferenceDescriptionCollection](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcreferencedescriptioncollection/) | The [OpcReferenceDescriptionCollection](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcreferencedescriptioncollection/) to which the references found are added. | **Returns** [OpcBrowsePoint](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcbrowsepoint/) An [OpcBrowsePoint](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcbrowsepoint/) to continue browsing at if not all references could be provided; otherwise a null reference (Nothing in Visual Basic). ### CreateHistory protected · virtual Creates the history entries of the `values` specified for the `node` specified.
```csharp protected virtual OpcStatusCollection CreateHistory( IOpcNode node, OpcHistoryModificationInfo modificationInfo, OpcValueCollection values) ```
```vbnet Protected Overridable Function CreateHistory( node As IOpcNode, modificationInfo As OpcHistoryModificationInfo, values As OpcValueCollection) As OpcStatusCollection ```
**Parameters** | Name | Type | Description | |---|---|---| | `node` | [IOpcNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcnode/) | The [IOpcNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcnode/) whose history is changed. | | `modificationInfo` | [OpcHistoryModificationInfo](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opchistorymodificationinfo/) | The [OpcHistoryModificationInfo](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opchistorymodificationinfo/) which describes the modification. | | `values` | [OpcValueCollection](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcvaluecollection/) | The [OpcValueCollection](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcvaluecollection/) with the values to create. | **Returns** [OpcStatusCollection](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcstatuscollection/) An [OpcStatusCollection](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcstatuscollection/) with the result per value. If [RetrieveNodeHistoryProvider](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodemanager/members#retrievenodehistoryprovider) provides no provider, each result has the code [BadHistoryOperationUnsupported](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcstatuscode/#badhistoryoperationunsupported). ### CreateNodes protected · virtual When overridden in a derived class, creates the nodes of the address space part maintained by the node manager.
```csharp protected virtual IEnumerable CreateNodes( OpcNodeReferenceCollection references) ```
```vbnet Protected Overridable Function CreateNodes( references As OpcNodeReferenceCollection) As IEnumerable(Of IOpcNode) ```
**Parameters** | Name | Type | Description | |---|---|---| | `references` | [OpcNodeReferenceCollection](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodereferencecollection/) | The [OpcNodeReferenceCollection](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodereferencecollection/) to which the references of the created nodes to further nodes (e.g. to their parent nodes) are to be added. | **Returns** [IEnumerable](https://learn.microsoft.com/dotnet/api/system.collections.generic.ienumerable-1)<[IOpcNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcnode/)> A sequence of the [IOpcNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcnode/) instances created. The base implementation provides no nodes. **Remarks** The server calls the method when it creates its address space while it is started. An exception thrown by the method is passed on as an [OpcException](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcexception/) and fails the start of the server. ### DeleteHistory protected · virtual · 3 overloads | Overload | Description | |---|---| | [DeleteHistory(IOpcNode, OpcHistoryModificationInfo, IEnumerable<DateTime>)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodemanager/members#deletehistory-opc-uafx-iopcnode-opc-uafx-opchistorymodificationinfo-system-collections-generic-ienumerable-of-system-datetime)protected · virtual | Deletes the history entries at the `times` specified of the `node` specified. | | [DeleteHistory(IOpcNode, OpcHistoryModificationInfo, OpcValueCollection)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodemanager/members#deletehistory-opc-uafx-iopcnode-opc-uafx-opchistorymodificationinfo-opc-uafx-opcvaluecollection)protected · virtual | Deletes the history entries of the `values` specified of the `node` specified. | | [DeleteHistory(IOpcNode, OpcHistoryModificationInfo, DateTime?, DateTime?, OpcDeleteHistoryOptions)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodemanager/members#deletehistory-opc-uafx-iopcnode-opc-uafx-opchistorymodificationinfo-system-nullable-of-system-datetime-system-nullable-of-system-datetime-opc-uafx-server-opcdeletehistoryoptions)protected · virtual | Deletes the history entries of the `node` specified within the time range specified. | #### DeleteHistory(IOpcNode, OpcHistoryModificationInfo, IEnumerable<DateTime>) protected · virtual Deletes the history entries at the `times` specified of the `node` specified.
```csharp protected virtual OpcStatusCollection DeleteHistory( IOpcNode node, OpcHistoryModificationInfo modificationInfo, IEnumerable times) ```
```vbnet Protected Overridable Function DeleteHistory( node As IOpcNode, modificationInfo As OpcHistoryModificationInfo, times As IEnumerable(Of Date)) As OpcStatusCollection ```
**Parameters** | Name | Type | Description | |---|---|---| | `node` | [IOpcNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcnode/) | The [IOpcNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcnode/) whose history is changed. | | `modificationInfo` | [OpcHistoryModificationInfo](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opchistorymodificationinfo/) | The [OpcHistoryModificationInfo](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opchistorymodificationinfo/) which describes the modification. | | `times` | [IEnumerable](https://learn.microsoft.com/dotnet/api/system.collections.generic.ienumerable-1)<[DateTime](https://learn.microsoft.com/dotnet/api/system.datetime)> | A sequence of the timestamps of the entries to delete. | **Returns** [OpcStatusCollection](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcstatuscollection/) An [OpcStatusCollection](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcstatuscollection/) with the result per timestamp. If [RetrieveNodeHistoryProvider](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodemanager/members#retrievenodehistoryprovider) provides no provider, each result has the code [BadHistoryOperationUnsupported](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcstatuscode/#badhistoryoperationunsupported). #### DeleteHistory(IOpcNode, OpcHistoryModificationInfo, OpcValueCollection) protected · virtual Deletes the history entries of the `values` specified of the `node` specified.
```csharp protected virtual OpcStatusCollection DeleteHistory( IOpcNode node, OpcHistoryModificationInfo modificationInfo, OpcValueCollection values) ```
```vbnet Protected Overridable Function DeleteHistory( node As IOpcNode, modificationInfo As OpcHistoryModificationInfo, values As OpcValueCollection) As OpcStatusCollection ```
**Parameters** | Name | Type | Description | |---|---|---| | `node` | [IOpcNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcnode/) | The [IOpcNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcnode/) whose history is changed. | | `modificationInfo` | [OpcHistoryModificationInfo](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opchistorymodificationinfo/) | The [OpcHistoryModificationInfo](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opchistorymodificationinfo/) which describes the modification. | | `values` | [OpcValueCollection](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcvaluecollection/) | The [OpcValueCollection](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcvaluecollection/) with the values whose entries are to be deleted. | **Returns** [OpcStatusCollection](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcstatuscollection/) An [OpcStatusCollection](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcstatuscollection/) with the result per value. If [RetrieveNodeHistoryProvider](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodemanager/members#retrievenodehistoryprovider) provides no provider, each result has the code [BadHistoryOperationUnsupported](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcstatuscode/#badhistoryoperationunsupported). #### DeleteHistory(IOpcNode, OpcHistoryModificationInfo, DateTime?, DateTime?, OpcDeleteHistoryOptions) protected · virtual Deletes the history entries of the `node` specified within the time range specified.
```csharp protected virtual OpcStatusCollection DeleteHistory( IOpcNode node, OpcHistoryModificationInfo modificationInfo, DateTime? startTime, DateTime? endTime, OpcDeleteHistoryOptions options) ```
```vbnet Protected Overridable Function DeleteHistory( node As IOpcNode, modificationInfo As OpcHistoryModificationInfo, startTime As Date?, endTime As Date?, options As OpcDeleteHistoryOptions) As OpcStatusCollection ```
**Parameters** | Name | Type | Description | |---|---|---| | `node` | [IOpcNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcnode/) | The [IOpcNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcnode/) whose history is changed. | | `modificationInfo` | [OpcHistoryModificationInfo](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opchistorymodificationinfo/) | The [OpcHistoryModificationInfo](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opchistorymodificationinfo/) which describes the modification. | | `startTime` | [Nullable](https://learn.microsoft.com/dotnet/api/system.nullable-1)<[DateTime](https://learn.microsoft.com/dotnet/api/system.datetime)> | The begin of the time range or a null reference (Nothing in Visual Basic) if the range is not limited at its begin. | | `endTime` | [Nullable](https://learn.microsoft.com/dotnet/api/system.nullable-1)<[DateTime](https://learn.microsoft.com/dotnet/api/system.datetime)> | The end of the time range or a null reference (Nothing in Visual Basic) if the range is not limited at its end. | | `options` | [OpcDeleteHistoryOptions](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcdeletehistoryoptions/) | A combination of the [OpcDeleteHistoryOptions](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcdeletehistoryoptions/) flags which specify the entries to delete. | **Returns** [OpcStatusCollection](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcstatuscollection/) An [OpcStatusCollection](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcstatuscollection/) with the result of the operation. If [RetrieveNodeHistoryProvider](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodemanager/members#retrievenodehistoryprovider) provides no provider, the collection contains one result with the code [BadHistoryOperationUnsupported](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcstatuscode/#badhistoryoperationunsupported). ### DeleteNodes protected · virtual When overridden in a derived class, releases the nodes of the node manager.
```csharp protected virtual void DeleteNodes() ```
```vbnet Protected Overridable Sub DeleteNodes() ```
**Remarks** The server calls the method when it deletes its address space. The base implementation does nothing. ### Dispose 2 overloads | Overload | Description | |---|---| | [Dispose()](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodemanager/members#dispose-noparams) | Releases all resources used by the [OpcNodeManager](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodemanager/). | | [Dispose(bool)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodemanager/members#dispose-system-boolean)protected · virtual | Releases the unmanaged resources used by the [OpcNodeManager](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodemanager/) and optionally releases the managed resources. | #### Dispose() Releases all resources used by the [OpcNodeManager](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodemanager/).
```csharp public void Dispose() ```
```vbnet Public Sub Dispose() ```
**Implements** [Dispose()](https://learn.microsoft.com/dotnet/api/system.idisposable.dispose) #### Dispose(bool) protected · virtual Releases the unmanaged resources used by the [OpcNodeManager](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodemanager/) and optionally releases the managed resources.
```csharp protected virtual void Dispose(bool disposing) ```
```vbnet Protected Overridable Sub Dispose(disposing As Boolean) ```
**Parameters** | Name | Type | Description | |---|---|---| | `disposing` | [Boolean](https://learn.microsoft.com/dotnet/api/system.boolean) | The value true to release both managed and unmanaged resources; otherwise the value false to release only unmanaged resources. | ### ExportNodes 2 overloads | Overload | Description | |---|---| | [ExportNodes()](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodemanager/members#exportnodes-noparams)since v2.11 | Exports the [Nodes](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodemanager/members#nodes) of the node manager using the [Default](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeexportoptions/members#default) options. | | [ExportNodes(OpcNodeExportOptions)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodemanager/members#exportnodes-opc-uafx-opcnodeexportoptions)since v2.12 | Exports the [Nodes](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodemanager/members#nodes) of the node manager using the `options` specified. | **Exceptions (all overloads)** | Exception | Condition | |---|---| | [InvalidOperationException](https://learn.microsoft.com/dotnet/api/system.invalidoperationexception) | The server using the node manager has not yet been started. | #### ExportNodes() since v2.11 Exports the [Nodes](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodemanager/members#nodes) of the node manager using the [Default](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeexportoptions/members#default) options.
```csharp public IEnumerable ExportNodes() ```
```vbnet Public Function ExportNodes() As IEnumerable(Of OpcNodeSet) ```
**Returns** [IEnumerable](https://learn.microsoft.com/dotnet/api/system.collections.generic.ienumerable-1)<[OpcNodeSet](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeset/)> A sequence of [OpcNodeSet](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeset/) instances, one per namespace of the node manager which contains nodes. **Remarks** The nodes are exported while the sequence is enumerated; the exception is thrown then as well. Nodes of a namespace which is not maintained by the node manager (see [Namespaces](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodemanager/members#namespaces)) are not exported. #### ExportNodes(OpcNodeExportOptions) since v2.12 Exports the [Nodes](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodemanager/members#nodes) of the node manager using the `options` specified.
```csharp public IEnumerable ExportNodes(OpcNodeExportOptions options) ```
```vbnet Public Function ExportNodes( options As OpcNodeExportOptions) As IEnumerable(Of OpcNodeSet) ```
**Parameters** | Name | Type | Description | |---|---|---| | `options` | [OpcNodeExportOptions](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeexportoptions/) | The [OpcNodeExportOptions](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeexportoptions/) to use or a null reference (Nothing in Visual Basic) to use the [Default](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeexportoptions/members#default) options. | **Returns** [IEnumerable](https://learn.microsoft.com/dotnet/api/system.collections.generic.ienumerable-1)<[OpcNodeSet](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeset/)> A sequence of [OpcNodeSet](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeset/) instances, one per namespace of the node manager which contains nodes. **Remarks** The nodes are exported while the sequence is enumerated; the exception is thrown then as well. Nodes of a namespace which is not maintained by the node manager (see [Namespaces](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodemanager/members#namespaces)) are not exported. ### GetNode 2 overloads · since v2.15 | Overload | Description | |---|---| | [GetNode(string)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodemanager/members#getnode-system-string)since v2.15 | Retrieves the [IOpcNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcnode/) which is maintained by the [Nodes](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodemanager/members#nodes) of this [OpcNodeManager](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodemanager/) and is known under the `nodePath` specified. | | [GetNode(OpcNodeId)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodemanager/members#getnode-opc-uafx-opcnodeid)since v2.15 | Retrieves the [IOpcNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcnode/) which is maintained by the [Nodes](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodemanager/members#nodes) of this [OpcNodeManager](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodemanager/) and is known under the `nodeId` specified. | #### GetNode(string) since v2.15 Retrieves the [IOpcNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcnode/) which is maintained by the [Nodes](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodemanager/members#nodes) of this [OpcNodeManager](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodemanager/) and is known under the `nodePath` specified.
```csharp public IOpcNode GetNode(string nodePath) ```
```vbnet Public Function GetNode(nodePath As String) As IOpcNode ```
**Parameters** | Name | Type | Description | |---|---|---| | `nodePath` | [String](https://learn.microsoft.com/dotnet/api/system.string) | A sequence of browse and symbolic names combined using a slash ('/') to describe the 'path' to the node to determine. To query a node using its browse name use the namespace qualified name format 'namespaceIndex:name'; otherwise the 'part of the path' is compared to the symbolic name of the node. | **Returns** [IOpcNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcnode/) An instance implementing the [IOpcNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcnode/) interface its [Name](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcnodeinfo/members#name) or [SymbolicName](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcnodeinfo/members#symbolicname) matches the last 'part' in the `nodePath` specified, if found; otherwise a null reference (Nothing in Visual Basic). **Exceptions** | Exception | Condition | |---|---| | [ArgumentException](https://learn.microsoft.com/dotnet/api/system.argumentexception) | The `nodePath` is an empty string. | | [ArgumentNullException](https://learn.microsoft.com/dotnet/api/system.argumentnullexception) | The `nodePath` is a null reference (Nothing in Visual Basic). | **Remarks** The first 'part' in the `nodePath` shall refer to a unique browse or symbolic name of a node maintained by the [Nodes](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodemanager/members#nodes); otherwise the first node which matches the browse or symbolic name specified is used to continue the node query. Note that this method does not support querying nodes which are organized in an ambiguous way (according to their sub-tree they reside). #### GetNode(OpcNodeId) since v2.15 Retrieves the [IOpcNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcnode/) which is maintained by the [Nodes](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodemanager/members#nodes) of this [OpcNodeManager](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodemanager/) and is known under the `nodeId` specified.
```csharp public IOpcNode GetNode(OpcNodeId nodeId) ```
```vbnet Public Function GetNode(nodeId As OpcNodeId) As IOpcNode ```
**Parameters** | Name | Type | Description | |---|---|---| | `nodeId` | [OpcNodeId](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeid/) | The [OpcNodeId](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeid/) of the [IOpcNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcnode/) instance to determine. | **Returns** [IOpcNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcnode/) An instance implementing the [IOpcNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcnode/) interface its [Id](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcnodeinfo/members#id) attribute is equals to the `nodeId` specified if found; otherwise a null reference (Nothing in Visual Basic). **Exceptions** | Exception | Condition | |---|---| | [ArgumentNullException](https://learn.microsoft.com/dotnet/api/system.argumentnullexception) | The `nodeId` is a null reference (Nothing in Visual Basic). | ### ImplementNode protected · virtual · since v2.9 When implemented in a derived class, implements the logic required to integrate the `node` into the underlying system.
```csharp protected virtual void ImplementNode(IOpcNode node) ```
```vbnet Protected Overridable Sub ImplementNode(node As IOpcNode) ```
**Parameters** | Name | Type | Description | |---|---|---| | `node` | [IOpcNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcnode/) | An instance implementing the [IOpcNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcnode/) interface which is to be integrated into the underlying system. | **Remarks** This method is called during the whole address space creation. This includes the import of nodes using [ImportNodes](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodemanager/members#importnodes) and the creation of nodes using [CreateNodes](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodemanager/members#createnodes). Each node imported / created is passed to this method to integrate it accordingly into the underlying system. Additionally this method is called after the startup of the server whenever a client adds another node to the address space part(s) maintained by the current [OpcNodeManager](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodemanager/). ### ImportNodes protected · virtual · since v2.9 When implemented in a derived class, offers the different [OpcNodeSet](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeset/)s which are imported prior any other nodes are created within the address space part organized by the current [OpcNodeManager](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodemanager/).
```csharp protected virtual IEnumerable ImportNodes() ```
```vbnet Protected Overridable Function ImportNodes() As IEnumerable(Of OpcNodeSet) ```
**Returns** [IEnumerable](https://learn.microsoft.com/dotnet/api/system.collections.generic.ienumerable-1)<[OpcNodeSet](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeset/)> A sequence of [OpcNodeSet](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeset/) instances to use to import external stored node information into the address space. ### IsNodeAccessible protected · virtual · since v2.7 Determines whether the `node` specified is accessible in the `context` and view specified.
```csharp protected virtual bool IsNodeAccessible( OpcContext context, OpcNodeId viewId, IOpcNodeInfo node) ```
```vbnet Protected Overridable Function IsNodeAccessible( context As OpcContext, viewId As OpcNodeId, node As IOpcNodeInfo) As Boolean ```
**Parameters** | Name | Type | Description | |---|---|---| | `context` | [OpcContext](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opccontext/) | The [OpcContext](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opccontext/) of the operation which accesses the node. | | `viewId` | [OpcNodeId](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeid/) | The [OpcNodeId](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeid/) of the view to check or [Null](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeid/members#null) if the node is not accessed through a view. | | `node` | [IOpcNodeInfo](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcnodeinfo/) | The [IOpcNodeInfo](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcnodeinfo/) of the node to check. | **Returns** [Boolean](https://learn.microsoft.com/dotnet/api/system.boolean) The value true if the node is accessible; otherwise the value false. The base implementation evaluates [IsAccessible](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnode/members#isaccessible) and, for a variable node, requires an [AccessLevel](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcvariablenode/members#accesslevel) or [UserAccessLevel](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcvariablenode/members#useraccesslevel) other than [None](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcaccesslevel/#none). **Exceptions** | Exception | Condition | |---|---| | [ArgumentNullException](https://learn.microsoft.com/dotnet/api/system.argumentnullexception) | The `context`, `viewId` or `node` is a null reference (Nothing in Visual Basic). | **Remarks** The server treats a node which is not accessible like a node which does not exist. ### IsNodeReadyToPublish protected · since v2.50 Determines a value indicating whether any applied node changes are awaiting to be published by at least one monitored item.
```csharp protected bool IsNodeReadyToPublish(IOpcNode node) ```
```vbnet Protected Function IsNodeReadyToPublish(node As IOpcNode) As Boolean ```
**Parameters** | Name | Type | Description | |---|---|---| | `node` | [IOpcNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcnode/) | The [IOpcNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcnode/) its publishing state is to be verified. | **Returns** [Boolean](https://learn.microsoft.com/dotnet/api/system.boolean) The value `true` if the `node` has applied changes which are awaiting to be published; otherwise the value `false`. **Exceptions** | Exception | Condition | |---|---| | [ArgumentNullException](https://learn.microsoft.com/dotnet/api/system.argumentnullexception) | The `node` is a null reference (Nothing in Visual Basic). | ### OnAfterRead protected · virtual Raises the [AfterRead](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodemanager/members#afterread) event of the [OpcNodeManager](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodemanager/).
```csharp protected virtual void OnAfterRead(OpcNodeAccessEventArgs e) ```
```vbnet Protected Overridable Sub OnAfterRead(e As OpcNodeAccessEventArgs) ```
**Parameters** | Name | Type | Description | |---|---|---| | `e` | [OpcNodeAccessEventArgs](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodeaccesseventargs/) | The event data. | ### OnAfterWrite protected · virtual Raises the [AfterWrite](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodemanager/members#afterwrite) event of the [OpcNodeManager](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodemanager/).
```csharp protected virtual void OnAfterWrite(OpcNodeAccessEventArgs e) ```
```vbnet Protected Overridable Sub OnAfterWrite(e As OpcNodeAccessEventArgs) ```
**Parameters** | Name | Type | Description | |---|---|---| | `e` | [OpcNodeAccessEventArgs](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodeaccesseventargs/) | The event data. | ### OnBeforeRead protected · virtual Raises the [BeforeRead](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodemanager/members#beforeread) event of the [OpcNodeManager](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodemanager/).
```csharp protected virtual void OnBeforeRead(OpcNodeAccessEventArgs e) ```
```vbnet Protected Overridable Sub OnBeforeRead(e As OpcNodeAccessEventArgs) ```
**Parameters** | Name | Type | Description | |---|---|---| | `e` | [OpcNodeAccessEventArgs](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodeaccesseventargs/) | The event data. | ### OnBeforeWrite protected · virtual Raises the [BeforeWrite](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodemanager/members#beforewrite) event of the [OpcNodeManager](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodemanager/).
```csharp protected virtual void OnBeforeWrite(OpcNodeAccessEventArgs e) ```
```vbnet Protected Overridable Sub OnBeforeWrite(e As OpcNodeAccessEventArgs) ```
**Parameters** | Name | Type | Description | |---|---|---| | `e` | [OpcNodeAccessEventArgs](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodeaccesseventargs/) | The event data. | ### OnMonitoredItemCreated protected · virtual Raises the [MonitoredItemCreated](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodemanager/members#monitoreditemcreated) event of the [OpcNodeManager](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodemanager/).
```csharp protected virtual void OnMonitoredItemCreated(OpcMonitoredItemEventArgs e) ```
```vbnet Protected Overridable Sub OnMonitoredItemCreated(e As OpcMonitoredItemEventArgs) ```
**Parameters** | Name | Type | Description | |---|---|---| | `e` | [OpcMonitoredItemEventArgs](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcmonitoreditemeventargs/) | The event data. | ### OnMonitoredItemDeleted protected · virtual Raises the [MonitoredItemDeleted](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodemanager/members#monitoreditemdeleted) event of the [OpcNodeManager](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodemanager/).
```csharp protected virtual void OnMonitoredItemDeleted(OpcMonitoredItemEventArgs e) ```
```vbnet Protected Overridable Sub OnMonitoredItemDeleted(e As OpcMonitoredItemEventArgs) ```
**Parameters** | Name | Type | Description | |---|---|---| | `e` | [OpcMonitoredItemEventArgs](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcmonitoreditemeventargs/) | The event data. | ### OnMonitoredItemModified protected · virtual Raises the [MonitoredItemModified](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodemanager/members#monitoreditemmodified) event of the [OpcNodeManager](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodemanager/).
```csharp protected virtual void OnMonitoredItemModified(OpcMonitoredItemEventArgs e) ```
```vbnet Protected Overridable Sub OnMonitoredItemModified( e As OpcMonitoredItemEventArgs) ```
**Parameters** | Name | Type | Description | |---|---|---| | `e` | [OpcMonitoredItemEventArgs](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcmonitoreditemeventargs/) | The event data. | ### OnMonitoredItemsCreated protected · virtual · since v2.7 Raises the [MonitoredItemsCreated](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodemanager/members#monitoreditemscreated) event of the [OpcNodeManager](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodemanager/).
```csharp protected virtual void OnMonitoredItemsCreated(OpcMonitoredItemsEventArgs e) ```
```vbnet Protected Overridable Sub OnMonitoredItemsCreated( e As OpcMonitoredItemsEventArgs) ```
**Parameters** | Name | Type | Description | |---|---|---| | `e` | [OpcMonitoredItemsEventArgs](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcmonitoreditemseventargs/) | The event data. | ### OnMonitoredItemsDeleted protected · virtual · since v2.7 Raises the [MonitoredItemsDeleted](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodemanager/members#monitoreditemsdeleted) event of the [OpcNodeManager](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodemanager/).
```csharp protected virtual void OnMonitoredItemsDeleted(OpcMonitoredItemsEventArgs e) ```
```vbnet Protected Overridable Sub OnMonitoredItemsDeleted( e As OpcMonitoredItemsEventArgs) ```
**Parameters** | Name | Type | Description | |---|---|---| | `e` | [OpcMonitoredItemsEventArgs](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcmonitoreditemseventargs/) | The event data. | ### OnMonitoredItemsModified protected · virtual · since v2.7 Raises the [MonitoredItemsModified](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodemanager/members#monitoreditemsmodified) event of the [OpcNodeManager](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodemanager/).
```csharp protected virtual void OnMonitoredItemsModified(OpcMonitoredItemsEventArgs e) ```
```vbnet Protected Overridable Sub OnMonitoredItemsModified( e As OpcMonitoredItemsEventArgs) ```
**Parameters** | Name | Type | Description | |---|---|---| | `e` | [OpcMonitoredItemsEventArgs](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcmonitoreditemseventargs/) | The event data. | ### QueryNode protected · virtual When overridden in a derived class, provides the node with the `nodeId` specified which is not part of the [Nodes](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodemanager/members#nodes).
```csharp protected virtual IOpcNode QueryNode(OpcNodeId nodeId) ```
```vbnet Protected Overridable Function QueryNode(nodeId As OpcNodeId) As IOpcNode ```
**Parameters** | Name | Type | Description | |---|---|---| | `nodeId` | [OpcNodeId](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeid/) | The [OpcNodeId](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeid/) of the node to provide. | **Returns** [IOpcNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcnode/) The [IOpcNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcnode/) with the `nodeId` specified, if known; otherwise a null reference (Nothing in Visual Basic). The base implementation returns a null reference. **Remarks** The method is called by [GetNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodemanager/members#getnode-opc-uafx-opcnodeid) and when the server looks up a node of the node manager which is not part of the [Nodes](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodemanager/members#nodes). ### Read protected · virtual Reads the attribute values requested by the `tokens` specified on behalf of a client.
```csharp protected virtual void Read( OpcContext context, OpcNodeAccessTokenCollection tokens) ```
```vbnet Protected Overridable Sub Read( context As OpcContext, tokens As OpcNodeAccessTokenCollection) ```
**Parameters** | Name | Type | Description | |---|---|---| | `context` | [OpcContext](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opccontext/) | The [OpcContext](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opccontext/) of the read operation. | | `tokens` | [OpcNodeAccessTokenCollection](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodeaccesstokencollection/) | The [OpcNodeAccessTokenCollection](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodeaccesstokencollection/) with one [OpcNodeAccessToken](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodeaccesstoken/) per attribute value to read, which receives the value and the result of the read. | **Remarks** The method raises the [BeforeRead](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodemanager/members#beforeread) event before and the [AfterRead](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodemanager/members#afterread) event after reading, also if reading fails. ### ReadEventHistory protected · virtual · since v2.54 Reads the history of the events of the `node` specified on behalf of a client.
```csharp protected virtual IEnumerable ReadEventHistory( OpcContext context, IOpcNode node, OpcEventFilter eventFilter, DateTime? startTime, DateTime? endTime, bool timeFlowsBackward, uint? maxCount) ```
```vbnet Protected Overridable Function ReadEventHistory( context As OpcContext, node As IOpcNode, eventFilter As OpcEventFilter, startTime As Date?, endTime As Date?, timeFlowsBackward As Boolean, maxCount As UInteger?) As IEnumerable(Of OpcEvent) ```
**Parameters** | Name | Type | Description | |---|---|---| | `context` | [OpcContext](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opccontext/) | The [OpcContext](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opccontext/) of the read operation. | | `node` | [IOpcNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcnode/) | The [IOpcNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcnode/) whose event history is read. | | `eventFilter` | [OpcEventFilter](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opceventfilter/) | The [OpcEventFilter](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opceventfilter/) which specifies the fields of the events to provide. | | `startTime` | [Nullable](https://learn.microsoft.com/dotnet/api/system.nullable-1)<[DateTime](https://learn.microsoft.com/dotnet/api/system.datetime)> | The begin of the time range to read or a null reference (Nothing in Visual Basic) if the range is not limited at its begin. | | `endTime` | [Nullable](https://learn.microsoft.com/dotnet/api/system.nullable-1)<[DateTime](https://learn.microsoft.com/dotnet/api/system.datetime)> | The end of the time range to read or a null reference (Nothing in Visual Basic) if the range is not limited at its end. | | `timeFlowsBackward` | [Boolean](https://learn.microsoft.com/dotnet/api/system.boolean) | The value true to provide the events in descending order of their timestamps; otherwise the value false. | | `maxCount` | [Nullable](https://learn.microsoft.com/dotnet/api/system.nullable-1)<[UInt32](https://learn.microsoft.com/dotnet/api/system.uint32)> | The maximum number of events to provide or a null reference (Nothing in Visual Basic) if the number is not limited. | **Returns** [IEnumerable](https://learn.microsoft.com/dotnet/api/system.collections.generic.ienumerable-1)<[OpcEvent](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcevent/)> A sequence of the [OpcEvent](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcevent/) instances read or a null reference (Nothing in Visual Basic) if [RetrieveEventHistoryProvider](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodemanager/members#retrieveeventhistoryprovider) provides no provider; in this case the client receives the code [BadNotSupported](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcstatuscode/#badnotsupported) for the node. ### ReadHistory protected · virtual · since v2.51 Reads the history of the values of the `node` specified on behalf of a client.
```csharp protected virtual IEnumerable ReadHistory( OpcContext context, IOpcNode node, DateTime? startTime, DateTime? endTime, bool timeFlowsBackward, uint? maxCount, OpcReadHistoryOptions options) ```
```vbnet Protected Overridable Function ReadHistory( context As OpcContext, node As IOpcNode, startTime As Date?, endTime As Date?, timeFlowsBackward As Boolean, maxCount As UInteger?, options As OpcReadHistoryOptions) As IEnumerable(Of OpcHistoryValue) ```
**Parameters** | Name | Type | Description | |---|---|---| | `context` | [OpcContext](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opccontext/) | The [OpcContext](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opccontext/) of the read operation. | | `node` | [IOpcNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcnode/) | The [IOpcNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcnode/) whose history is read. | | `startTime` | [Nullable](https://learn.microsoft.com/dotnet/api/system.nullable-1)<[DateTime](https://learn.microsoft.com/dotnet/api/system.datetime)> | The begin of the time range to read or a null reference (Nothing in Visual Basic) if the range is not limited at its begin. | | `endTime` | [Nullable](https://learn.microsoft.com/dotnet/api/system.nullable-1)<[DateTime](https://learn.microsoft.com/dotnet/api/system.datetime)> | The end of the time range to read or a null reference (Nothing in Visual Basic) if the range is not limited at its end. | | `timeFlowsBackward` | [Boolean](https://learn.microsoft.com/dotnet/api/system.boolean) | The value true to provide the values in descending order of their timestamps; otherwise the value false. | | `maxCount` | [Nullable](https://learn.microsoft.com/dotnet/api/system.nullable-1)<[UInt32](https://learn.microsoft.com/dotnet/api/system.uint32)> | The maximum number of values to provide or a null reference (Nothing in Visual Basic) if the number is not limited. | | `options` | [OpcReadHistoryOptions](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcreadhistoryoptions/) | A combination of the [OpcReadHistoryOptions](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcreadhistoryoptions/) flags which specify the values to provide. | **Returns** [IEnumerable](https://learn.microsoft.com/dotnet/api/system.collections.generic.ienumerable-1)<[OpcHistoryValue](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opchistoryvalue/)> A sequence of the [OpcHistoryValue](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opchistoryvalue/) instances read or a null reference (Nothing in Visual Basic) if [RetrieveNodeHistoryProvider](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodemanager/members#retrievenodehistoryprovider) provides no provider; in this case the client receives the code [BadNotSupported](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcstatuscode/#badnotsupported) for the node. ### RemoveNode 4 overloads | Overload | Description | |---|---| | [RemoveNode(IOpcNode)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodemanager/members#removenode-opc-uafx-iopcnode) | Removes the `node` specified from the address space of the node manager. | | [RemoveNode(OpcContext, IOpcNode)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodemanager/members#removenode-opc-uafx-opccontext-opc-uafx-iopcnode)since v2.7 | Removes the `node` specified from the address space of the node manager using the `context` specified. | | [RemoveNode(IOpcNode, OpcLocalReferenceCollection)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodemanager/members#removenode-opc-uafx-iopcnode-opc-uafx-server-opclocalreferencecollection)protected · since v2.7 | Removes the `node` specified from the address space of the node manager and collects the `references` to remove from further node managers. | | [RemoveNode(OpcContext, IOpcNode, OpcLocalReferenceCollection)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodemanager/members#removenode-opc-uafx-opccontext-opc-uafx-iopcnode-opc-uafx-server-opclocalreferencecollection)protected · virtual · since v2.7 | Removes the `node` specified from the address space of the node manager using the `context` specified and collects the `references` to remove from further node managers. | **Exceptions (all overloads)** | Exception | Condition | |---|---| | [InvalidOperationException](https://learn.microsoft.com/dotnet/api/system.invalidoperationexception) | The server using the node manager has not yet been started. | #### RemoveNode(IOpcNode) Removes the `node` specified from the address space of the node manager.
```csharp public void RemoveNode(IOpcNode node) ```
```vbnet Public Sub RemoveNode(node As IOpcNode) ```
**Parameters** | Name | Type | Description | |---|---|---| | `node` | [IOpcNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcnode/) | The [IOpcNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcnode/) to remove. | **Exceptions** | Exception | Condition | |---|---| | [ArgumentNullException](https://learn.microsoft.com/dotnet/api/system.argumentnullexception) | The `node` is a null reference (Nothing in Visual Basic). | **Remarks** The references between the node and the nodes of other node managers are removed as well. #### RemoveNode(OpcContext, IOpcNode) since v2.7 Removes the `node` specified from the address space of the node manager using the `context` specified.
```csharp public void RemoveNode(OpcContext context, IOpcNode node) ```
```vbnet Public Sub RemoveNode(context As OpcContext, node As IOpcNode) ```
**Parameters** | Name | Type | Description | |---|---|---| | `context` | [OpcContext](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opccontext/) | The [OpcContext](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opccontext/) to use to remove the node. | | `node` | [IOpcNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcnode/) | The [IOpcNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcnode/) to remove. | **Exceptions** | Exception | Condition | |---|---| | [ArgumentNullException](https://learn.microsoft.com/dotnet/api/system.argumentnullexception) | The `context` or `node` is a null reference (Nothing in Visual Basic). | **Remarks** The references between the node and the nodes of other node managers are removed as well. #### RemoveNode(IOpcNode, OpcLocalReferenceCollection) protected · since v2.7 Removes the `node` specified from the address space of the node manager and collects the `references` to remove from further node managers.
```csharp protected void RemoveNode(IOpcNode node, OpcLocalReferenceCollection references) ```
```vbnet Protected Sub RemoveNode( node As IOpcNode, references As OpcLocalReferenceCollection) ```
**Parameters** | Name | Type | Description | |---|---|---| | `node` | [IOpcNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcnode/) | The [IOpcNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcnode/) to remove. | | `references` | [OpcLocalReferenceCollection](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opclocalreferencecollection/) | The [OpcLocalReferenceCollection](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opclocalreferencecollection/) to which the references between the node and the nodes of other node managers are added. | **Exceptions** | Exception | Condition | |---|---| | [ArgumentNullException](https://learn.microsoft.com/dotnet/api/system.argumentnullexception) | The `node` is a null reference (Nothing in Visual Basic). | **Remarks** Unlike [RemoveNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodemanager/members#removenode-opc-uafx-iopcnode) the method does not remove the collected `references` from the other node managers. #### RemoveNode(OpcContext, IOpcNode, OpcLocalReferenceCollection) protected · virtual · since v2.7 Removes the `node` specified from the address space of the node manager using the `context` specified and collects the `references` to remove from further node managers.
```csharp protected virtual void RemoveNode( OpcContext context, IOpcNode node, OpcLocalReferenceCollection references) ```
```vbnet Protected Overridable Sub RemoveNode( context As OpcContext, node As IOpcNode, references As OpcLocalReferenceCollection) ```
**Parameters** | Name | Type | Description | |---|---|---| | `context` | [OpcContext](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opccontext/) | The [OpcContext](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opccontext/) to use to remove the node. | | `node` | [IOpcNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcnode/) | The [IOpcNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcnode/) to remove. | | `references` | [OpcLocalReferenceCollection](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opclocalreferencecollection/) | The [OpcLocalReferenceCollection](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opclocalreferencecollection/) to which the references between the node and the nodes of other node managers are added. | **Exceptions** | Exception | Condition | |---|---| | [ArgumentNullException](https://learn.microsoft.com/dotnet/api/system.argumentnullexception) | The `context` or `node` is a null reference (Nothing in Visual Basic). | **Remarks** The server calls the method also when it removes a node of the node manager. The method does not remove the collected `references` from the other node managers. ### RemoveNotifierNode protected Removes the `node` from the collection of 'root' notifiers (= event sources) of the 'Server' node.
```csharp protected void RemoveNotifierNode(IOpcNode node) ```
```vbnet Protected Sub RemoveNotifierNode(node As IOpcNode) ```
**Parameters** | Name | Type | Description | |---|---|---| | `node` | [IOpcNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcnode/) | The [IOpcNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcnode/) instance acting as the notifier of the 'Server' node. | **Exceptions** | Exception | Condition | |---|---| | [ArgumentNullException](https://learn.microsoft.com/dotnet/api/system.argumentnullexception) | The `node` is a null reference (Nothing in Visual Basic). | | [InvalidOperationException](https://learn.microsoft.com/dotnet/api/system.invalidoperationexception) | The master node has not yet been created, therefore the operation is at the moment not available. | ### ReplaceHistory protected · virtual Replaces the history entries of the `values` specified of the `node` specified.
```csharp protected virtual OpcStatusCollection ReplaceHistory( IOpcNode node, OpcHistoryModificationInfo modificationInfo, OpcValueCollection values) ```
```vbnet Protected Overridable Function ReplaceHistory( node As IOpcNode, modificationInfo As OpcHistoryModificationInfo, values As OpcValueCollection) As OpcStatusCollection ```
**Parameters** | Name | Type | Description | |---|---|---| | `node` | [IOpcNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcnode/) | The [IOpcNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcnode/) whose history is changed. | | `modificationInfo` | [OpcHistoryModificationInfo](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opchistorymodificationinfo/) | The [OpcHistoryModificationInfo](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opchistorymodificationinfo/) which describes the modification. | | `values` | [OpcValueCollection](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcvaluecollection/) | The [OpcValueCollection](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcvaluecollection/) with the values to replace the existing entries with. | **Returns** [OpcStatusCollection](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcstatuscollection/) An [OpcStatusCollection](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcstatuscollection/) with the result per value. If [RetrieveNodeHistoryProvider](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodemanager/members#retrievenodehistoryprovider) provides no provider, each result has the code [BadHistoryOperationUnsupported](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcstatuscode/#badhistoryoperationunsupported). ### ReplaceNode protected · since v2.9 Replaces an existing [IOpcNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcnode/) instance with the specified `node` without invalidating existing monitored items nor previously defined notifiers.
```csharp protected void ReplaceNode(IOpcNode node) ```
```vbnet Protected Sub ReplaceNode(node As IOpcNode) ```
**Parameters** | Name | Type | Description | |---|---|---| | `node` | [IOpcNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcnode/) | The [IOpcNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcnode/) instance its [Id](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcnodeinfo/members#id) is used to determine existing monitored items, notifiers and nodes to replace with the new one. | **Exceptions** | Exception | Condition | |---|---| | [ArgumentNullException](https://learn.microsoft.com/dotnet/api/system.argumentnullexception) | The `node` is a null reference (Nothing in Visual Basic). | | [InvalidOperationException](https://learn.microsoft.com/dotnet/api/system.invalidoperationexception) | The master node has not yet been created, therefore the operation is at the moment not available. | **Remarks** To replace an existing node the [OpcNodeId](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeid/) of the `node` specified needs to match the [Id](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcnodeinfo/members#id) of an existing [IOpcNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcnode/) instance. This method replaces an existing node and all of its children recursively in the [Nodes](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodemanager/members#nodes) of this [OpcNodeManager](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodemanager/) and in the list of notifiers as well in the list of monitored items / nodes. The caller of this method have to ensure that the `node` specified is as compatible to the previous node as the clients of the server expect. This includes for example the attributes or other metrics of a dedicated type of node to which a client may belong. ### ReportEvent 7 overloads | Overload | Description | |---|---| | [ReportEvent(OpcEventNode)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodemanager/members#reportevent-opc-uafx-opceventnode) | Produces a global event using the `eventNode` specified. | | [ReportEvent(OpcEventSeverity, OpcText)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodemanager/members#reportevent-opc-uafx-opceventseverity-opc-uafx-opctext) | Produces a global event using the event data specified. | | [ReportEvent(OpcEventSeverity, OpcText, params object\[\])](#reportevent-opc-uafx-opceventseverity-opc-uafx-opctext-system-object-array) | Produces a global event using the event data specified. | | [ReportEvent(OpcNodeId, string, OpcEventSeverity, OpcText)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodemanager/members#reportevent-opc-uafx-opcnodeid-system-string-opc-uafx-opceventseverity-opc-uafx-opctext) | Produces a global event using the event data specified. | | [ReportEvent(OpcNodeId, string, OpcEventSeverity, OpcText, params object\[\])](#reportevent-opc-uafx-opcnodeid-system-string-opc-uafx-opceventseverity-opc-uafx-opctext-system-object-array) | Produces a global event using the event data specified. | | [ReportEvent(IOpcNode, OpcEventSeverity, OpcText)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodemanager/members#reportevent-opc-uafx-iopcnode-opc-uafx-opceventseverity-opc-uafx-opctext) | Produces a global event using the event data specified. | | [ReportEvent(IOpcNode, OpcEventSeverity, OpcText, params object\[\])](#reportevent-opc-uafx-iopcnode-opc-uafx-opceventseverity-opc-uafx-opctext-system-object-array) | Produces a global event using the event data specified. | **Exceptions (all overloads)** | Exception | Condition | |---|---| | [InvalidOperationException](https://learn.microsoft.com/dotnet/api/system.invalidoperationexception) | The master node has not yet been created, therefore the operation is at the moment not available. | | [OpcException](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcexception/) | The operation failed (see exception details for more information). | #### ReportEvent(OpcEventNode) Produces a global event using the `eventNode` specified.
```csharp public void ReportEvent(OpcEventNode eventNode) ```
```vbnet Public Sub ReportEvent(eventNode As OpcEventNode) ```
**Parameters** | Name | Type | Description | |---|---|---| | `eventNode` | [OpcEventNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opceventnode/) | The [OpcEventNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opceventnode/) its event information is to be reported as a global event. | **Exceptions** | Exception | Condition | |---|---| | [ArgumentNullException](https://learn.microsoft.com/dotnet/api/system.argumentnullexception) | The `eventNode` is a null reference (Nothing in Visual Basic). | #### ReportEvent(OpcEventSeverity, OpcText) Produces a global event using the event data specified.
```csharp public void ReportEvent(OpcEventSeverity severity, OpcText message) ```
```vbnet Public Sub ReportEvent(severity As OpcEventSeverity, message As OpcText) ```
**Parameters** | Name | Type | Description | |---|---|---| | `severity` | [OpcEventSeverity](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opceventseverity/) | An indication of the urgency of the event. | | `message` | [OpcText](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opctext/) | A human-readable and localizable text description of the event. | **Exceptions** | Exception | Condition | |---|---| | [ArgumentNullException](https://learn.microsoft.com/dotnet/api/system.argumentnullexception) | The `message` is a null reference (Nothing in Visual Basic). | #### ReportEvent(OpcEventSeverity, OpcText, params object\[\]) Produces a global event using the event data specified.
```csharp public void ReportEvent( OpcEventSeverity severity, OpcText message, params object[] arguments) ```
```vbnet Public Sub ReportEvent( severity As OpcEventSeverity, message As OpcText, ParamArray arguments As Object()) ```
**Parameters** | Name | Type | Description | |---|---|---| | `severity` | [OpcEventSeverity](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opceventseverity/) | An indication of the urgency of the event. | | `message` | [OpcText](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opctext/) | A human-readable and localizable text description of the event with format placeholders which where replaced with the `arguments` specified. | | `arguments` | params [Object](https://learn.microsoft.com/dotnet/api/system.object)[] | The values to place into the `message` using its format placeholders. | **Exceptions** | Exception | Condition | |---|---| | [ArgumentNullException](https://learn.microsoft.com/dotnet/api/system.argumentnullexception) | The `message` is a null reference (Nothing in Visual Basic). | #### ReportEvent(OpcNodeId, string, OpcEventSeverity, OpcText) Produces a global event using the event data specified.
```csharp public void ReportEvent( OpcNodeId sourceNodeId, string sourceName, OpcEventSeverity severity, OpcText message) ```
```vbnet Public Sub ReportEvent( sourceNodeId As OpcNodeId, sourceName As String, severity As OpcEventSeverity, message As OpcText) ```
**Parameters** | Name | Type | Description | |---|---|---| | `sourceNodeId` | [OpcNodeId](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeid/) | The [OpcNodeId](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeid/) which is to be used for the [SourceNodeId](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcevent/members#sourcenodeid) property to define the origin of the event produced. | | `sourceName` | [String](https://learn.microsoft.com/dotnet/api/system.string) | The [string](https://learn.microsoft.com/dotnet/api/system.string) which is to be used for the [SourceName](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcevent/members#sourcename). | | `severity` | [OpcEventSeverity](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opceventseverity/) | An indication of the urgency of the event. | | `message` | [OpcText](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opctext/) | A human-readable and localizable text description of the event. | **Exceptions** | Exception | Condition | |---|---| | [ArgumentNullException](https://learn.microsoft.com/dotnet/api/system.argumentnullexception) | The `message` is a null reference (Nothing in Visual Basic). | #### ReportEvent(OpcNodeId, string, OpcEventSeverity, OpcText, params object\[\]) Produces a global event using the event data specified.
```csharp public void ReportEvent( OpcNodeId sourceNodeId, string sourceName, OpcEventSeverity severity, OpcText message, params object[] arguments) ```
```vbnet Public Sub ReportEvent( sourceNodeId As OpcNodeId, sourceName As String, severity As OpcEventSeverity, message As OpcText, ParamArray arguments As Object()) ```
**Parameters** | Name | Type | Description | |---|---|---| | `sourceNodeId` | [OpcNodeId](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeid/) | The [OpcNodeId](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeid/) which is to be used for the [SourceNodeId](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcevent/members#sourcenodeid) property to define the origin of the event produced. | | `sourceName` | [String](https://learn.microsoft.com/dotnet/api/system.string) | The [string](https://learn.microsoft.com/dotnet/api/system.string) which is to be used for the [SourceName](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcevent/members#sourcename). | | `severity` | [OpcEventSeverity](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opceventseverity/) | An indication of the urgency of the event. | | `message` | [OpcText](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opctext/) | A human-readable and localizable text description of the event with format placeholders which where replaced with the `arguments` specified. | | `arguments` | params [Object](https://learn.microsoft.com/dotnet/api/system.object)[] | The values to place into the `message` using its format placeholders. | **Exceptions** | Exception | Condition | |---|---| | [ArgumentNullException](https://learn.microsoft.com/dotnet/api/system.argumentnullexception) | The `message` is a null reference (Nothing in Visual Basic). | #### ReportEvent(IOpcNode, OpcEventSeverity, OpcText) Produces a global event using the event data specified.
```csharp public void ReportEvent( IOpcNode source, OpcEventSeverity severity, OpcText message) ```
```vbnet Public Sub ReportEvent( source As IOpcNode, severity As OpcEventSeverity, message As OpcText) ```
**Parameters** | Name | Type | Description | |---|---|---| | `source` | [IOpcNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcnode/) | The [IOpcNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcnode/) instance its [Id](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcnodeinfo/members#id) is used for the [SourceNodeId](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcevent/members#sourcenodeid) property and its [SymbolicName](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcnodeinfo/members#symbolicname) is used for the [SourceName](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcevent/members#sourcename) property to define the origin of the event produced. | | `severity` | [OpcEventSeverity](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opceventseverity/) | An indication of the urgency of the event. | | `message` | [OpcText](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opctext/) | A human-readable and localizable text description of the event. | **Exceptions** | Exception | Condition | |---|---| | [ArgumentNullException](https://learn.microsoft.com/dotnet/api/system.argumentnullexception) | The `source` or `message` is a null reference (Nothing in Visual Basic). | #### ReportEvent(IOpcNode, OpcEventSeverity, OpcText, params object\[\]) Produces a global event using the event data specified.
```csharp public void ReportEvent( IOpcNode source, OpcEventSeverity severity, OpcText message, params object[] arguments) ```
```vbnet Public Sub ReportEvent( source As IOpcNode, severity As OpcEventSeverity, message As OpcText, ParamArray arguments As Object()) ```
**Parameters** | Name | Type | Description | |---|---|---| | `source` | [IOpcNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcnode/) | The [IOpcNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcnode/) instance its [Id](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcnodeinfo/members#id) is used for the [SourceNodeId](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcevent/members#sourcenodeid) property and its [SymbolicName](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcnodeinfo/members#symbolicname) is used for the [SourceName](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcevent/members#sourcename) property to define the origin of the event produced. | | `severity` | [OpcEventSeverity](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opceventseverity/) | An indication of the urgency of the event. | | `message` | [OpcText](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opctext/) | A human-readable and localizable text description of the event with format placeholders which where replaced with the `arguments` specified. | | `arguments` | params [Object](https://learn.microsoft.com/dotnet/api/system.object)[] | The values to place into the `message` using its format placeholders. | **Exceptions** | Exception | Condition | |---|---| | [ArgumentNullException](https://learn.microsoft.com/dotnet/api/system.argumentnullexception) | The `source` or `message` is a null reference (Nothing in Visual Basic). | ### RetrieveEventHistoryProvider protected · virtual · since v2.54 Retrieves the provider which provides the history of the events of the `node` specified.
```csharp protected virtual IOpcEventHistoryProvider RetrieveEventHistoryProvider( IOpcNode node) ```
```vbnet Protected Overridable Function RetrieveEventHistoryProvider( node As IOpcNode) As IOpcEventHistoryProvider ```
**Parameters** | Name | Type | Description | |---|---|---| | `node` | [IOpcNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcnode/) | The [IOpcNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcnode/) whose event history is accessed. | **Returns** [IOpcEventHistoryProvider](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.iopceventhistoryprovider/) The [IOpcEventHistoryProvider](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.iopceventhistoryprovider/) to use or a null reference (Nothing in Visual Basic) if the event history of the node is not available. The base implementation returns the `node` if it implements [IOpcEventHistoryProvider](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.iopceventhistoryprovider/). ### RetrieveNodeHistoryProvider protected · virtual Retrieves the provider which provides the history of the values of the `node` specified.
```csharp protected virtual IOpcNodeHistoryProvider RetrieveNodeHistoryProvider( IOpcNode node) ```
```vbnet Protected Overridable Function RetrieveNodeHistoryProvider( node As IOpcNode) As IOpcNodeHistoryProvider ```
**Parameters** | Name | Type | Description | |---|---|---| | `node` | [IOpcNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcnode/) | The [IOpcNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcnode/) whose history is accessed. | **Returns** [IOpcNodeHistoryProvider](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.iopcnodehistoryprovider/) The [IOpcNodeHistoryProvider](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.iopcnodehistoryprovider/) to use or a null reference (Nothing in Visual Basic) if the history of the node is not available. The base implementation returns the `node` if it implements [IOpcNodeHistoryProvider](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.iopcnodehistoryprovider/). ### UpdateHistory protected · virtual Updates the history entries of the `values` specified of the `node` specified.
```csharp protected virtual OpcStatusCollection UpdateHistory( IOpcNode node, OpcHistoryModificationInfo modificationInfo, OpcValueCollection values) ```
```vbnet Protected Overridable Function UpdateHistory( node As IOpcNode, modificationInfo As OpcHistoryModificationInfo, values As OpcValueCollection) As OpcStatusCollection ```
**Parameters** | Name | Type | Description | |---|---|---| | `node` | [IOpcNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcnode/) | The [IOpcNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcnode/) whose history is changed. | | `modificationInfo` | [OpcHistoryModificationInfo](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opchistorymodificationinfo/) | The [OpcHistoryModificationInfo](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opchistorymodificationinfo/) which describes the modification. | | `values` | [OpcValueCollection](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcvaluecollection/) | The [OpcValueCollection](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcvaluecollection/) with the values to create or to replace the existing entries with. | **Returns** [OpcStatusCollection](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcstatuscollection/) An [OpcStatusCollection](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcstatuscollection/) with the result per value. If [RetrieveNodeHistoryProvider](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodemanager/members#retrievenodehistoryprovider) provides no provider, each result has the code [BadHistoryOperationUnsupported](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcstatuscode/#badhistoryoperationunsupported). ### Write protected · virtual Writes the attribute values provided by the `tokens` specified on behalf of a client.
```csharp protected virtual void Write( OpcContext context, OpcNodeAccessTokenCollection tokens) ```
```vbnet Protected Overridable Sub Write( context As OpcContext, tokens As OpcNodeAccessTokenCollection) ```
**Parameters** | Name | Type | Description | |---|---|---| | `context` | [OpcContext](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opccontext/) | The [OpcContext](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opccontext/) of the write operation. | | `tokens` | [OpcNodeAccessTokenCollection](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodeaccesstokencollection/) | The [OpcNodeAccessTokenCollection](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodeaccesstokencollection/) with one [OpcNodeAccessToken](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodeaccesstoken/) per attribute value to write, which receives the result of the write. | **Remarks** The method raises the [BeforeWrite](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodemanager/members#beforewrite) event before and the [AfterWrite](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodemanager/members#afterwrite) event after writing, also if writing fails. ## Events ### AfterRead Occurs after the node manager has read attribute values of its nodes on behalf of a client (see [Read](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodemanager/members#read)), also if reading has failed.
```csharp public event OpcNodeAccessEventHandler AfterRead ```
```vbnet Public Event AfterRead As OpcNodeAccessEventHandler ```
**Event type** [OpcNodeAccessEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodeaccesseventhandler/) ### AfterWrite Occurs after the node manager has written attribute values of its nodes on behalf of a client (see [Write](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodemanager/members#write)), also if writing has failed.
```csharp public event OpcNodeAccessEventHandler AfterWrite ```
```vbnet Public Event AfterWrite As OpcNodeAccessEventHandler ```
**Event type** [OpcNodeAccessEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodeaccesseventhandler/) ### BeforeRead Occurs before the node manager reads attribute values of its nodes on behalf of a client (see [Read](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodemanager/members#read)).
```csharp public event OpcNodeAccessEventHandler BeforeRead ```
```vbnet Public Event BeforeRead As OpcNodeAccessEventHandler ```
**Event type** [OpcNodeAccessEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodeaccesseventhandler/) ### BeforeWrite Occurs before the node manager writes attribute values of its nodes on behalf of a client (see [Write](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodemanager/members#write)).
```csharp public event OpcNodeAccessEventHandler BeforeWrite ```
```vbnet Public Event BeforeWrite As OpcNodeAccessEventHandler ```
**Event type** [OpcNodeAccessEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodeaccesseventhandler/) ### MonitoredItemCreated Occurs when a new monitored item is created through a [OpcSession](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcsession/).
```csharp public event OpcMonitoredItemEventHandler MonitoredItemCreated ```
```vbnet Public Event MonitoredItemCreated As OpcMonitoredItemEventHandler ```
**Event type** [OpcMonitoredItemEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcmonitoreditemeventhandler/) ### MonitoredItemDeleted Occurs when an existing monitored item of a [OpcSession](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcsession/) has been deleted.
```csharp public event OpcMonitoredItemEventHandler MonitoredItemDeleted ```
```vbnet Public Event MonitoredItemDeleted As OpcMonitoredItemEventHandler ```
**Event type** [OpcMonitoredItemEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcmonitoreditemeventhandler/) ### MonitoredItemModified Occurs when an existing monitored item of a [OpcSession](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcsession/) has been modified.
```csharp public event OpcMonitoredItemEventHandler MonitoredItemModified ```
```vbnet Public Event MonitoredItemModified As OpcMonitoredItemEventHandler ```
**Event type** [OpcMonitoredItemEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcmonitoreditemeventhandler/) ### MonitoredItemsCreated since v2.7 Occurs when a set of new monitored items is created through a [OpcSession](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcsession/).
```csharp public event OpcMonitoredItemsEventHandler MonitoredItemsCreated ```
```vbnet Public Event MonitoredItemsCreated As OpcMonitoredItemsEventHandler ```
**Event type** [OpcMonitoredItemsEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcmonitoreditemseventhandler/) ### MonitoredItemsDeleted since v2.7 Occurs when a set of existing monitored items of a [OpcSession](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcsession/) has been deleted.
```csharp public event OpcMonitoredItemsEventHandler MonitoredItemsDeleted ```
```vbnet Public Event MonitoredItemsDeleted As OpcMonitoredItemsEventHandler ```
**Event type** [OpcMonitoredItemsEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcmonitoreditemseventhandler/) ### MonitoredItemsModified since v2.7 Occurs when a set of existing monitored items of a [OpcSession](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcsession/) has been modified.
```csharp public event OpcMonitoredItemsEventHandler MonitoredItemsModified ```
```vbnet Public Event MonitoredItemsModified As OpcMonitoredItemsEventHandler ```
**Event type** [OpcMonitoredItemsEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcmonitoreditemseventhandler/)