# OpcEventFieldSelectOptions Enum

> Reference: Specifies the options used by an OpcEventFilterFactory to select the fields of the event types.

<span class="api-meta">since v2.50</span>

<dl class="api-definition">
<dt>Namespace</dt>
<dd><a href="../namespaces/opc.uafx.client">Opc.UaFx.Client</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>

Specifies the options used by an [OpcEventFilterFactory](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opceventfilterfactory/) to select the fields of the event types.

## Syntax

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

```csharp
public enum OpcEventFieldSelectOptions
```

</div>

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

```vbnet
<Flags>
Public Enum OpcEventFieldSelectOptions
```

</div>

## Inheritance

[Object](https://learn.microsoft.com/dotnet/api/system.object) → [ValueType](https://learn.microsoft.com/dotnet/api/system.valuetype) → [Enum](https://learn.microsoft.com/dotnet/api/system.enum) → **OpcEventFieldSelectOptions**

## Fields

| Name | Value | Description |
|---|---|---|
| <a id="none"></a>`None` | `0` | Specifies that no flags are in effect. |
| <a id="useexpliciteventtypeids"></a>`UseExplicitEventTypeIds` | `1` | Specifies that the the NodeId of the actual event type is used for the attribute operands, instead of the nodeId of the BaseEventType (`i=2041`). |

## Applies to

| Package | Versions |
|---|---|
| Opc.UaFx.Advanced | v2.50–v2.59 |