# OpcNodeServiceCommand Members
> Reference: Provides an abstract base class for node orientated OPC UA services which at least require the OpcNodeId of a specific node to operate on.
- Type
- OpcNodeServiceCommand
- Namespace
- Opc.UaFx.Services
- Assembly
- Opc.UaFx.Advanced.dll
- Package
- Opc.UaFx.Advanced v2.59.0
- Also in
- Opc.UaFx.Client
Inherits members from [OpcServiceCommand](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.services.opcservicecommand/members).
## Constructors
### OpcNodeServiceCommand
protected · 16 overloads
| Overload | Description |
|---|---|
| [OpcNodeServiceCommand(OpcNodeId)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.services.opcnodeservicecommand/members#opcnodeservicecommand-opc-uafx-opcnodeid)protected | Initializes a new instance of the [OpcNodeServiceCommand](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.services.opcnodeservicecommand/) class using the `nodeId` specified. |
| [OpcNodeServiceCommand(byte\[\])](#opcnodeservicecommand-system-byte-array)protected | Initializes a new instance of the [OpcNodeServiceCommand](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.services.opcnodeservicecommand/) class using the `nodeId` specified. |
| [OpcNodeServiceCommand(byte\[\], int)](#opcnodeservicecommand-system-byte-array-system-int32)protected | Initializes a new instance of the [OpcNodeServiceCommand](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.services.opcnodeservicecommand/) class using the `nodeId` and `namespaceIndex` specified. |
| [OpcNodeServiceCommand(byte\[\], OpcNamespace)](#opcnodeservicecommand-system-byte-array-opc-uafx-opcnamespace)protected | Initializes a new instance of the [OpcNodeServiceCommand](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.services.opcnodeservicecommand/) class using the `nodeId` and `nodeNamespace` specified. |
| [OpcNodeServiceCommand(Guid)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.services.opcnodeservicecommand/members#opcnodeservicecommand-system-guid)protected | Initializes a new instance of the [OpcNodeServiceCommand](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.services.opcnodeservicecommand/) class using the `nodeId` specified. |
| [OpcNodeServiceCommand(Guid, int)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.services.opcnodeservicecommand/members#opcnodeservicecommand-system-guid-system-int32)protected | Initializes a new instance of the [OpcNodeServiceCommand](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.services.opcnodeservicecommand/) class using the `nodeId` and `namespaceIndex` specified. |
| [OpcNodeServiceCommand(Guid, OpcNamespace)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.services.opcnodeservicecommand/members#opcnodeservicecommand-system-guid-opc-uafx-opcnamespace)protected | Initializes a new instance of the [OpcNodeServiceCommand](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.services.opcnodeservicecommand/) class using the `nodeId` and `nodeNamespace` specified. |
| [OpcNodeServiceCommand(int)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.services.opcnodeservicecommand/members#opcnodeservicecommand-system-int32)protected | Initializes a new instance of the [OpcNodeServiceCommand](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.services.opcnodeservicecommand/) class using the `nodeId` specified. |
| [OpcNodeServiceCommand(int, int)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.services.opcnodeservicecommand/members#opcnodeservicecommand-system-int32-system-int32)protected | Initializes a new instance of the [OpcNodeServiceCommand](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.services.opcnodeservicecommand/) class using the `nodeId` and `namespaceIndex` specified. |
| [OpcNodeServiceCommand(int, OpcNamespace)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.services.opcnodeservicecommand/members#opcnodeservicecommand-system-int32-opc-uafx-opcnamespace)protected | Initializes a new instance of the [OpcNodeServiceCommand](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.services.opcnodeservicecommand/) class using the `nodeId` and `nodeNamespace` specified. |
| [OpcNodeServiceCommand(uint)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.services.opcnodeservicecommand/members#opcnodeservicecommand-system-uint32)protected | Initializes a new instance of the [OpcNodeServiceCommand](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.services.opcnodeservicecommand/) class using the `nodeId` specified. |
| [OpcNodeServiceCommand(uint, int)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.services.opcnodeservicecommand/members#opcnodeservicecommand-system-uint32-system-int32)protected | Initializes a new instance of the [OpcNodeServiceCommand](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.services.opcnodeservicecommand/) class using the `nodeId` and `namespaceIndex` specified. |
| [OpcNodeServiceCommand(uint, OpcNamespace)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.services.opcnodeservicecommand/members#opcnodeservicecommand-system-uint32-opc-uafx-opcnamespace)protected | Initializes a new instance of the [OpcNodeServiceCommand](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.services.opcnodeservicecommand/) class using the `nodeId` and `nodeNamespace` specified. |
| [OpcNodeServiceCommand(string)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.services.opcnodeservicecommand/members#opcnodeservicecommand-system-string)protected | Initializes a new instance of the [OpcNodeServiceCommand](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.services.opcnodeservicecommand/) class using the `nodeId` specified. |
| [OpcNodeServiceCommand(string, int)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.services.opcnodeservicecommand/members#opcnodeservicecommand-system-string-system-int32)protected | Initializes a new instance of the [OpcNodeServiceCommand](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.services.opcnodeservicecommand/) class using the `nodeId` and `namespaceIndex` specified. |
| [OpcNodeServiceCommand(string, OpcNamespace)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.services.opcnodeservicecommand/members#opcnodeservicecommand-system-string-opc-uafx-opcnamespace)protected | Initializes a new instance of the [OpcNodeServiceCommand](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.services.opcnodeservicecommand/) class using the `nodeId` and `nodeNamespace` specified. |
#### OpcNodeServiceCommand(OpcNodeId)
protected
Initializes a new instance of the [OpcNodeServiceCommand](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.services.opcnodeservicecommand/) class using the `nodeId` specified.
```csharp
protected OpcNodeServiceCommand(OpcNodeId nodeId)
```
```vbnet
Protected Sub New(nodeId As OpcNodeId)
```
**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 on which the service, who will execute this command, will operate. |
**Exceptions**
| Exception | Condition |
|---|---|
| [ArgumentException](https://learn.microsoft.com/dotnet/api/system.argumentexception) | The command does not support empty node identifiers. |
| [ArgumentNullException](https://learn.microsoft.com/dotnet/api/system.argumentnullexception) | The `nodeId` is a null reference (Nothing in Visual Basic). |
#### OpcNodeServiceCommand(byte\[\])
protected
Initializes a new instance of the [OpcNodeServiceCommand](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.services.opcnodeservicecommand/) class using the `nodeId` specified.
```csharp
protected OpcNodeServiceCommand(byte[] nodeId)
```
```vbnet
Protected Sub New(nodeId As Byte())
```
**Parameters**
| Name | Type | Description |
|---|---|---|
| `nodeId` | [Byte](https://learn.microsoft.com/dotnet/api/system.byte)[] | The opaque node identifier of the node on which the service, who will execute this command, will operate. |
#### OpcNodeServiceCommand(byte\[\], int)
protected
Initializes a new instance of the [OpcNodeServiceCommand](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.services.opcnodeservicecommand/) class using the `nodeId` and `namespaceIndex` specified.
```csharp
protected OpcNodeServiceCommand(byte[] nodeId, int namespaceIndex)
```
```vbnet
Protected Sub New(nodeId As Byte(), namespaceIndex As Integer)
```
**Parameters**
| Name | Type | Description |
|---|---|---|
| `nodeId` | [Byte](https://learn.microsoft.com/dotnet/api/system.byte)[] | The opaque node identifier of the node on which the service, who will execute this command, will operate. |
| `namespaceIndex` | [Int32](https://learn.microsoft.com/dotnet/api/system.int32) | The index of the namespace within that the node with the `nodeId` specified can be located. |
#### OpcNodeServiceCommand(byte\[\], OpcNamespace)
protected
Initializes a new instance of the [OpcNodeServiceCommand](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.services.opcnodeservicecommand/) class using the `nodeId` and `nodeNamespace` specified.
```csharp
protected OpcNodeServiceCommand(byte[] nodeId, OpcNamespace nodeNamespace)
```
```vbnet
Protected Sub New(nodeId As Byte(), nodeNamespace As OpcNamespace)
```
**Parameters**
| Name | Type | Description |
|---|---|---|
| `nodeId` | [Byte](https://learn.microsoft.com/dotnet/api/system.byte)[] | The opaque node identifier of the node on which the service, who will execute this command, will operate. |
| `nodeNamespace` | [OpcNamespace](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnamespace/) | The namespace within that the node with the `nodeId` specified can be located. |
#### OpcNodeServiceCommand(Guid)
protected
Initializes a new instance of the [OpcNodeServiceCommand](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.services.opcnodeservicecommand/) class using the `nodeId` specified.
```csharp
protected OpcNodeServiceCommand(Guid nodeId)
```
```vbnet
Protected Sub New(nodeId As Guid)
```
**Parameters**
| Name | Type | Description |
|---|---|---|
| `nodeId` | [Guid](https://learn.microsoft.com/dotnet/api/system.guid) | The general unique identifier (= GUID) of the node on which the service, who will execute this command, will operate. |
#### OpcNodeServiceCommand(Guid, int)
protected
Initializes a new instance of the [OpcNodeServiceCommand](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.services.opcnodeservicecommand/) class using the `nodeId` and `namespaceIndex` specified.
```csharp
protected OpcNodeServiceCommand(Guid nodeId, int namespaceIndex)
```
```vbnet
Protected Sub New(nodeId As Guid, namespaceIndex As Integer)
```
**Parameters**
| Name | Type | Description |
|---|---|---|
| `nodeId` | [Guid](https://learn.microsoft.com/dotnet/api/system.guid) | The general unique identifier (= GUID) of the node on which the service, who will execute this command, will operate. |
| `namespaceIndex` | [Int32](https://learn.microsoft.com/dotnet/api/system.int32) | The index of the namespace within that the node with the `nodeId` specified can be located. |
#### OpcNodeServiceCommand(Guid, OpcNamespace)
protected
Initializes a new instance of the [OpcNodeServiceCommand](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.services.opcnodeservicecommand/) class using the `nodeId` and `nodeNamespace` specified.
```csharp
protected OpcNodeServiceCommand(Guid nodeId, OpcNamespace nodeNamespace)
```
```vbnet
Protected Sub New(nodeId As Guid, nodeNamespace As OpcNamespace)
```
**Parameters**
| Name | Type | Description |
|---|---|---|
| `nodeId` | [Guid](https://learn.microsoft.com/dotnet/api/system.guid) | The general unique identifier (= GUID) of the node on which the service, who will execute this command, will operate. |
| `nodeNamespace` | [OpcNamespace](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnamespace/) | The namespace within that the node with the `nodeId` specified can be located. |
#### OpcNodeServiceCommand(int)
protected
Initializes a new instance of the [OpcNodeServiceCommand](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.services.opcnodeservicecommand/) class using the `nodeId` specified.
```csharp
protected OpcNodeServiceCommand(int nodeId)
```
```vbnet
Protected Sub New(nodeId As Integer)
```
**Parameters**
| Name | Type | Description |
|---|---|---|
| `nodeId` | [Int32](https://learn.microsoft.com/dotnet/api/system.int32) | The numeric node identifier of the node on which the service, who will execute this command, will operate. |
#### OpcNodeServiceCommand(int, int)
protected
Initializes a new instance of the [OpcNodeServiceCommand](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.services.opcnodeservicecommand/) class using the `nodeId` and `namespaceIndex` specified.
```csharp
protected OpcNodeServiceCommand(int nodeId, int namespaceIndex)
```
```vbnet
Protected Sub New(nodeId As Integer, namespaceIndex As Integer)
```
**Parameters**
| Name | Type | Description |
|---|---|---|
| `nodeId` | [Int32](https://learn.microsoft.com/dotnet/api/system.int32) | The numeric node identifier of the node on which the service, who will execute this command, will operate. |
| `namespaceIndex` | [Int32](https://learn.microsoft.com/dotnet/api/system.int32) | The index of the namespace within that the node with the `nodeId` specified can be located. |
#### OpcNodeServiceCommand(int, OpcNamespace)
protected
Initializes a new instance of the [OpcNodeServiceCommand](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.services.opcnodeservicecommand/) class using the `nodeId` and `nodeNamespace` specified.
```csharp
protected OpcNodeServiceCommand(int nodeId, OpcNamespace nodeNamespace)
```
```vbnet
Protected Sub New(nodeId As Integer, nodeNamespace As OpcNamespace)
```
**Parameters**
| Name | Type | Description |
|---|---|---|
| `nodeId` | [Int32](https://learn.microsoft.com/dotnet/api/system.int32) | The numeric node identifier of the node on which the service, who will execute this command, will operate. |
| `nodeNamespace` | [OpcNamespace](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnamespace/) | The namespace within that the node with the `nodeId` specified can be located. |
#### OpcNodeServiceCommand(uint)
protected
Initializes a new instance of the [OpcNodeServiceCommand](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.services.opcnodeservicecommand/) class using the `nodeId` specified.
```csharp
protected OpcNodeServiceCommand(uint nodeId)
```
```vbnet
Protected Sub New(nodeId As UInteger)
```
**Parameters**
| Name | Type | Description |
|---|---|---|
| `nodeId` | [UInt32](https://learn.microsoft.com/dotnet/api/system.uint32) | The numeric node identifier of the node on which the service, who will execute this command, will operate. |
#### OpcNodeServiceCommand(uint, int)
protected
Initializes a new instance of the [OpcNodeServiceCommand](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.services.opcnodeservicecommand/) class using the `nodeId` and `namespaceIndex` specified.
```csharp
protected OpcNodeServiceCommand(uint nodeId, int namespaceIndex)
```
```vbnet
Protected Sub New(nodeId As UInteger, namespaceIndex As Integer)
```
**Parameters**
| Name | Type | Description |
|---|---|---|
| `nodeId` | [UInt32](https://learn.microsoft.com/dotnet/api/system.uint32) | The numeric node identifier of the node on which the service, who will execute this command, will operate. |
| `namespaceIndex` | [Int32](https://learn.microsoft.com/dotnet/api/system.int32) | The index of the namespace within that the node with the `nodeId` specified can be located. |
#### OpcNodeServiceCommand(uint, OpcNamespace)
protected
Initializes a new instance of the [OpcNodeServiceCommand](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.services.opcnodeservicecommand/) class using the `nodeId` and `nodeNamespace` specified.
```csharp
protected OpcNodeServiceCommand(uint nodeId, OpcNamespace nodeNamespace)
```
```vbnet
Protected Sub New(nodeId As UInteger, nodeNamespace As OpcNamespace)
```
**Parameters**
| Name | Type | Description |
|---|---|---|
| `nodeId` | [UInt32](https://learn.microsoft.com/dotnet/api/system.uint32) | The numeric node identifier of the node on which the service, who will execute this command, will operate. |
| `nodeNamespace` | [OpcNamespace](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnamespace/) | The namespace within that the node with the `nodeId` specified can be located. |
#### OpcNodeServiceCommand(string)
protected
Initializes a new instance of the [OpcNodeServiceCommand](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.services.opcnodeservicecommand/) class using the `nodeId` specified.
```csharp
protected OpcNodeServiceCommand(string nodeId)
```
```vbnet
Protected Sub New(nodeId As String)
```
**Parameters**
| Name | Type | Description |
|---|---|---|
| `nodeId` | [String](https://learn.microsoft.com/dotnet/api/system.string) | The textual node identifier of the node on which the service, who will execute this command, will operate. |
#### OpcNodeServiceCommand(string, int)
protected
Initializes a new instance of the [OpcNodeServiceCommand](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.services.opcnodeservicecommand/) class using the `nodeId` and `namespaceIndex` specified.
```csharp
protected OpcNodeServiceCommand(string nodeId, int namespaceIndex)
```
```vbnet
Protected Sub New(nodeId As String, namespaceIndex As Integer)
```
**Parameters**
| Name | Type | Description |
|---|---|---|
| `nodeId` | [String](https://learn.microsoft.com/dotnet/api/system.string) | The textual node identifier of the node on which the service, who will execute this command, will operate. |
| `namespaceIndex` | [Int32](https://learn.microsoft.com/dotnet/api/system.int32) | The index of the namespace within that the node with the `nodeId` specified can be located. |
#### OpcNodeServiceCommand(string, OpcNamespace)
protected
Initializes a new instance of the [OpcNodeServiceCommand](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.services.opcnodeservicecommand/) class using the `nodeId` and `nodeNamespace` specified.
```csharp
protected OpcNodeServiceCommand(string nodeId, OpcNamespace nodeNamespace)
```
```vbnet
Protected Sub New(nodeId As String, nodeNamespace As OpcNamespace)
```
**Parameters**
| Name | Type | Description |
|---|---|---|
| `nodeId` | [String](https://learn.microsoft.com/dotnet/api/system.string) | The textual node identifier of the node on which the service, who will execute this command, will operate. |
| `nodeNamespace` | [OpcNamespace](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnamespace/) | The namespace within that the node with the `nodeId` specified can be located. |
## Properties
### NodeId
Gets the node identifier of the node on which a node orientated service have to operate on.
```csharp
public OpcNodeId NodeId { get; }
```
```vbnet
Public Property NodeId As OpcNodeId
```
**Property value**
[OpcNodeId](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeid/)
An instance of the [OpcNodeId](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeid/) class identifying the node on which a node orientated service have to operate on.
### SupportsNullNodeId
protected · virtual
Gets a value indicating whether the [OpcNodeServiceCommand](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.services.opcnodeservicecommand/) supports instances of the [OpcNodeId](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeid/) class its [IsNull](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeid/members#isnull) provides a value equals to the value true.
```csharp
protected virtual bool SupportsNullNodeId { get; }
```
```vbnet
Protected Overridable ReadOnly Property SupportsNullNodeId As Boolean
```
**Property value**
[Boolean](https://learn.microsoft.com/dotnet/api/system.boolean)
The value true in the case there the [OpcNodeId](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeid/) instance of the command can be a null-node-id; otherwise the value false.
**Remarks**
In case there this property provides the value false and an instance of the [OpcNodeId](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeid/) is passed to the constructor of this class an [ArgumentException](https://learn.microsoft.com/dotnet/api/system.argumentexception) will be thrown.
## Methods
### DenyNullIdentifier
protected · since v2.7
Verifies whether the `value` is a null identifier by checking the [IsNull](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeid/members#isnull) property.
```csharp
protected void DenyNullIdentifier(OpcNodeId value, string valueName)
```
```vbnet
Protected Sub DenyNullIdentifier(value As OpcNodeId, valueName As String)
```
**Parameters**
| Name | Type | Description |
|---|---|---|
| `value` | [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/) to verify. |
| `valueName` | [String](https://learn.microsoft.com/dotnet/api/system.string) | The name of the `value` passed. This is used in case there `value` is a null identifier. |
**Exceptions**
| Exception | Condition |
|---|---|
| [ArgumentException](https://learn.microsoft.com/dotnet/api/system.argumentexception) | The [IsNull](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeid/members#isnull) of `value` is equals true. |