# IOpcUnregisterNodesService Members

> Reference: Defines a specialized IOpcService<TResponse, TRequest> which can be used to unregister one or more nodes to not longer optimize their node access.

<dl class="api-definition">
<dt>Type</dt>
<dd><a href="./">IOpcUnregisterNodesService</a></dd>
<dt>Namespace</dt>
<dd><a href="../namespaces/opc.uafx.services">Opc.UaFx.Services</a></dd>
<dt>Assembly</dt>
<dd>Opc.UaFx.Advanced.dll</dd>
<dt>Package</dt>
<dd>Opc.UaFx.Advanced v2.59.0</dd>
<dt>Also in</dt>
<dd>Opc.UaFx.Client</dd>
</dl>

Inherits members from [IOpcService&lt;OpcUnregisterNodesResponse, OpcUnregisterNodesRequest&gt;](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.services.iopcservice-2/members).

## Methods

### UnregisterNodes

<span class="api-meta">2 overloads</span>

| Overload | Description |
|---|---|
| [UnregisterNodes(IEnumerable&lt;OpcUnregisterNode&gt;)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.services.iopcunregisternodesservice/members#unregisternodes-system-collections-generic-ienumerable-of-opc-uafx-opcunregisternode) | Unregisters one or more nodes to not longer optimize their node access using the specified `commands`. |
| [UnregisterNodes(params OpcUnregisterNode\[\])](#unregisternodes-opc-uafx-opcunregisternode-array) | Unregisters one or more nodes to not longer optimize their node access using the specified `commands`. |

**Exceptions (all overloads)**

| Exception | Condition |
|---|---|
| [ArgumentNullException](https://learn.microsoft.com/dotnet/api/system.argumentnullexception) | The `commands` sequence or one of its items is a null reference (Nothing in Visual Basic). |
| [InvalidOperationException](https://learn.microsoft.com/dotnet/api/system.invalidoperationexception) | The unregister nodes service is currently not supported, especially using the `commands` specified. |
| [OpcException](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcexception/) | The service execution failed upon different circumstances; for more details see exception details. The following issues can lead to that exception: [BadNothingToDo](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcstatuscode/#badnothingtodo) and [BadTooManyMatches](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcstatuscode/#badtoomanymatches). |

#### UnregisterNodes(IEnumerable&lt;OpcUnregisterNode&gt;)

Unregisters one or more nodes to not longer optimize their node access using the specified `commands`.

<div class="api-signature" data-lang="csharp">

```csharp
void UnregisterNodes(IEnumerable<OpcUnregisterNode> commands)
```

</div>

<div class="api-signature" data-lang="vbnet">

```vbnet
Sub UnregisterNodes(commands As IEnumerable(Of OpcUnregisterNode))
```

</div>

**Parameters**

| Name | Type | Description |
|---|---|---|
| `commands` | [IEnumerable](https://learn.microsoft.com/dotnet/api/system.collections.generic.ienumerable-1)&lt;[OpcUnregisterNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcunregisternode/)&gt; | A sequence of [OpcUnregisterNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcunregisternode/) instances to process. |

#### UnregisterNodes(params OpcUnregisterNode\[\])

Unregisters one or more nodes to not longer optimize their node access using the specified `commands`.

<div class="api-signature" data-lang="csharp">

```csharp
void UnregisterNodes(params OpcUnregisterNode[] commands)
```

</div>

<div class="api-signature" data-lang="vbnet">

```vbnet
Sub UnregisterNodes(ParamArray commands As OpcUnregisterNode())
```

</div>

**Parameters**

| Name | Type | Description |
|---|---|---|
| `commands` | params [OpcUnregisterNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcunregisternode/)[] | An array of [OpcUnregisterNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcunregisternode/) instances to process. |