# OpcEventTypeAttribute Class

> Reference: Defines the identifier of a custom event type which is represented by the Type on that this attribute is applied.

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

Defines the identifier of a custom event type which is represented by the [Type](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opceventtypeattribute/members#type) on that this attribute is applied. If the [Type](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opceventtypeattribute/members#type) which uses the attribute is an 'OpcEventNode' derivate the attribute additionally defined which type of [OpcEvent](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcevent/) instances are reported.

## Syntax

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

```csharp
public class OpcEventTypeAttribute : Attribute
```

</div>

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

```vbnet
<AttributeUsage(AttributeTargets.Class, AllowMultiple:=False, Inherited:=True)>
Public Class OpcEventTypeAttribute
    Inherits Attribute
```

</div>

## Inheritance

[Object](https://learn.microsoft.com/dotnet/api/system.object) → [Attribute](https://learn.microsoft.com/dotnet/api/system.attribute) → **OpcEventTypeAttribute**

## Constructors

| Name | Description |
|---|---|
| [OpcEventTypeAttribute](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opceventtypeattribute/members#opceventtypeattribute)<span class="api-meta">13 overloads</span> | Initializes a new instance of the OpcEventTypeAttribute class using the specified `type`. |

## Properties

| Name | Description |
|---|---|
| [Id](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opceventtypeattribute/members#id)<span class="api-meta">since v2.8</span> | Gets the node identifier used to define the event type node of the [Type](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opceventtypeattribute/members#type) to that the attribute has been applied. |
| [Type](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opceventtypeattribute/members#type) | Gets the [Type](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opceventtypeattribute/members#type) of [OpcEvent](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcevent/) produced by the attribute owner. |

Inherits members from [Attribute](https://learn.microsoft.com/dotnet/api/system.attribute).

## Applies to

| Package | Versions |
|---|---|
| Opc.UaFx.Advanced | v2.5–v2.59 |