# OpcNodeModel Members

Type: OpcNodeModel
Namespace: Opc.UaFx
Assembly: Opc.UaFx.Advanced.dll
Package: Opc.UaFx.Advanced v2.59.0

## Properties ### Directive

```csharp public OpcModellingDirective Directive { get; } ```

```vbnet Public ReadOnly Property Directive As OpcModellingDirective ```

**Property value** [OpcModellingDirective](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcmodellingdirective/) ### Name

```csharp public OpcName Name { get; } ```

```vbnet Public ReadOnly Property Name As OpcName ```

**Property value** [OpcName](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcname/) ### None static

```csharp public static OpcNodeModel None { get; } ```

```vbnet Public Shared ReadOnly Property None As OpcNodeModel ```

**Property value** [OpcNodeModel](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodemodel/) ## Methods ### Child

```csharp public OpcNodeModel Child(OpcName name) ```

```vbnet Public Function Child(name As OpcName) As OpcNodeModel ```

**Parameters** | Name | Type | Description | |---|---|---| | `name` | [OpcName](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcname/) | | **Returns** [OpcNodeModel](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodemodel/) **Exceptions** | Exception | Condition | |---|---| | [ArgumentNullException](https://learn.microsoft.com/dotnet/api/system.argumentnullexception) | | ### Children

```csharp public IEnumerable Children() ```

```vbnet Public Function Children() As IEnumerable(Of OpcNodeModel) ```

**Returns** [IEnumerable](https://learn.microsoft.com/dotnet/api/system.collections.generic.ienumerable-1)<[OpcNodeModel](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodemodel/)> ### ChildrenWith

```csharp public IEnumerable ChildrenWith(OpcModellingRule rule) ```

```vbnet Public Function ChildrenWith( rule As OpcModellingRule) As IEnumerable(Of OpcNodeModel) ```

**Parameters** | Name | Type | Description | |---|---|---| | `rule` | [OpcModellingRule](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcmodellingrule/) | | **Returns** [IEnumerable](https://learn.microsoft.com/dotnet/api/system.collections.generic.ienumerable-1)<[OpcNodeModel](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodemodel/)> ### Create 2 overloads | Overload | Description | |---|---| | [Create(OpcName)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodemodel/members#create-opc-uafx-opcname) | | | [Create(OpcName, bool)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodemodel/members#create-opc-uafx-opcname-system-boolean) | | **Exceptions (all overloads)** | Exception | Condition | |---|---| | [ArgumentNullException](https://learn.microsoft.com/dotnet/api/system.argumentnullexception) | | #### Create(OpcName)

```csharp public OpcNodeModel Create(OpcName name) ```

```vbnet Public Function Create(name As OpcName) As OpcNodeModel ```

```csharp public OpcNodeModel Create(OpcName name, bool recursive) ```

```vbnet Public Function Create(name As OpcName, recursive As Boolean) As OpcNodeModel ```

**Parameters** | Name | Type | Description | |---|---|---| | `name` | [OpcName](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcname/) | | | `recursive` | [Boolean](https://learn.microsoft.com/dotnet/api/system.boolean) | | **Returns** [OpcNodeModel](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodemodel/) ### CreateByDefault 2 overloads | Overload | Description | |---|---| | [CreateByDefault()](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodemodel/members#createbydefault-noparams) | | | [CreateByDefault(bool)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodemodel/members#createbydefault-system-boolean)since v2.51 | | #### CreateByDefault()

```csharp public OpcNodeModel CreateByDefault() ```

```vbnet Public Function CreateByDefault() As OpcNodeModel ```

**Returns** [OpcNodeModel](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodemodel/) #### CreateByDefault(bool) since v2.51

```csharp public OpcNodeModel CreateByDefault(bool recursive) ```

```vbnet Public Function CreateByDefault(recursive As Boolean) As OpcNodeModel ```

**Parameters** | Name | Type | Description | |---|---|---| | `recursive` | [Boolean](https://learn.microsoft.com/dotnet/api/system.boolean) | | **Returns** [OpcNodeModel](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodemodel/) ### CreateIf 2 overloads | Overload | Description | |---|---| | [CreateIf(Func<OpcName, bool>)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodemodel/members#createif-system-func-of-opc-uafx-opcname-system-boolean) | | | [CreateIf(Func<OpcNamePath, bool>, bool)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodemodel/members#createif-system-func-of-opc-uafx-opcnamepath-system-boolean-system-boolean) | | **Exceptions (all overloads)** | Exception | Condition | |---|---| | [ArgumentNullException](https://learn.microsoft.com/dotnet/api/system.argumentnullexception) | | #### CreateIf(Func<OpcName, bool>)

```csharp public OpcNodeModel CreateIf(Func predicate) ```

```vbnet Public Function CreateIf(predicate As Func(Of OpcName, Boolean)) As OpcNodeModel ```

**Parameters** | Name | Type | Description | |---|---|---| | `predicate` | [Func](https://learn.microsoft.com/dotnet/api/system.func-2)<[OpcName](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcname/), [Boolean](https://learn.microsoft.com/dotnet/api/system.boolean)> | | **Returns** [OpcNodeModel](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodemodel/) #### CreateIf(Func<OpcNamePath, bool>, bool)

```csharp public OpcNodeModel CreateIf(Func predicate, bool recursive) ```

```vbnet Public Function CreateIf( predicate As Func(Of OpcNamePath, Boolean), recursive As Boolean) As OpcNodeModel ```

**Parameters** | Name | Type | Description | |---|---|---| | `predicate` | [Func](https://learn.microsoft.com/dotnet/api/system.func-2)<[OpcNamePath](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnamepath/), [Boolean](https://learn.microsoft.com/dotnet/api/system.boolean)> | | | `recursive` | [Boolean](https://learn.microsoft.com/dotnet/api/system.boolean) | | **Returns** [OpcNodeModel](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodemodel/) ### CreateLike

```csharp public OpcNodeModel CreateLike(IOpcNodeInfo node) ```

```vbnet Public Function CreateLike(node As IOpcNodeInfo) As OpcNodeModel ```

**Parameters** | Name | Type | Description | |---|---|---| | `node` | [IOpcNodeInfo](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcnodeinfo/) | | **Returns** [OpcNodeModel](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodemodel/) **Exceptions** | Exception | Condition | |---|---| | [ArgumentNullException](https://learn.microsoft.com/dotnet/api/system.argumentnullexception) | | ### CreateOptionals

```csharp public OpcNodeModel CreateOptionals() ```

```vbnet Public Function CreateOptionals() As OpcNodeModel ```

**Returns** [OpcNodeModel](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodemodel/) ### Of static Creates the model a node type defines for its instances.

```csharp public static OpcNodeModel Of(IOpcNodeTypeInfo nodeType) ```

```vbnet Public Shared Function [Of](nodeType As IOpcNodeTypeInfo) As OpcNodeModel ```

**Parameters** | Name | Type | Description | |---|---|---| | `nodeType` | [IOpcNodeTypeInfo](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcnodetypeinfo/) | The [IOpcNodeTypeInfo](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcnodetypeinfo/) whose model is to be created. | **Returns** [OpcNodeModel](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodemodel/) A new instance of the [OpcNodeModel](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodemodel/) class with the children of the `nodeType` and their attributes. **Exceptions** | Exception | Condition | |---|---| | [ArgumentNullException](https://learn.microsoft.com/dotnet/api/system.argumentnullexception) | The `nodeType` is a null reference (Nothing in Visual Basic). | **Remarks** A node created without a model keeps the defaults of the SDK, such as a variable that clients can read and write. A node created with the model of its type takes the attributes the type defines instead, such as the access levels a companion specification declares in its NodeSet. The node manager can pass it once the NodeSet is imported, for example in `CreateNodes`: ```csharp var type = this.SystemContext.GetNodeType(OpcMachineryNodes.MachineIdentificationType); var identification = new OpcMachineIdentificationNode(OpcNodeModel.Of(type), machine, name); ``` ### OmitByDefault 2 overloads | Overload | Description | |---|---| | [OmitByDefault()](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodemodel/members#omitbydefault-noparams) | | | [OmitByDefault(bool)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodemodel/members#omitbydefault-system-boolean)since v2.51 | | #### OmitByDefault()

```csharp public OpcNodeModel OmitByDefault() ```

```vbnet Public Function OmitByDefault() As OpcNodeModel ```

**Returns** [OpcNodeModel](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodemodel/) #### OmitByDefault(bool) since v2.51

```csharp public OpcNodeModel OmitByDefault(bool recursive) ```

```vbnet Public Function OmitByDefault(recursive As Boolean) As OpcNodeModel ```

```csharp public OpcNodeModel OmitOptionals() ```

```vbnet Public Function OmitOptionals() As OpcNodeModel ```

**Returns** [OpcNodeModel](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodemodel/) #### OmitOptionals(bool) since v2.51

```csharp public OpcNodeModel OmitOptionals(bool recursive) ```

```vbnet Public Function OmitOptionals(recursive As Boolean) As OpcNodeModel ```

```csharp public override string ToString() ```

```vbnet Public Overrides Function ToString() As String ```

**Returns** [String](https://learn.microsoft.com/dotnet/api/system.string) **Overrides** [ToString()](https://learn.microsoft.com/dotnet/api/system.object.tostring)