# OpcEventNode Members

> Reference: Defines a generic base class for all general characteristics of an OPC UA Event.

<dl class="api-definition">
<dt>Type</dt>
<dd><a href="./">OpcEventNode</a></dd>
<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>
</dl>

Inherits members from [OpcObjectNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcobjectnode/members), [OpcInstanceNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcinstancenode/members), [OpcNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnode/members).

## Constructors

### OpcEventNode

<span class="api-meta">10 overloads</span>

| Overload | Description |
|---|---|
| [OpcEventNode(OpcName)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opceventnode/members#opceventnode-opc-uafx-opcname) | Initializes a new instance of the [OpcEventNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opceventnode/) class accessible by the `name` specified. |
| [OpcEventNode(OpcName, OpcNodeId)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opceventnode/members#opceventnode-opc-uafx-opcname-opc-uafx-opcnodeid) | Initializes a new instance of the [OpcEventNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opceventnode/) class accessible by the `name` and `id` specified. |
| [OpcEventNode(IOpcNode, OpcName)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opceventnode/members#opceventnode-opc-uafx-iopcnode-opc-uafx-opcname) | Initializes a new instance of the [OpcEventNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opceventnode/) class accessible by the `name` specified as a child node of the `parent` node given. |
| [OpcEventNode(IOpcNode, OpcName, OpcNodeId)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opceventnode/members#opceventnode-opc-uafx-iopcnode-opc-uafx-opcname-opc-uafx-opcnodeid) | Initializes a new instance of the [OpcEventNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opceventnode/) class accessible by the `name` and `id` specified as a child node of the `parent` node given. |
| [OpcEventNode(BaseEventState)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opceventnode/members#opceventnode-opc-ua-baseeventstate)<span class="api-meta">protected · since v2.50</span> | Initializes a new instance of the [OpcEventNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opceventnode/) class using the `content` as the instance to wrap. |
| [OpcEventNode(BaseEventState, OpcNodeModel)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opceventnode/members#opceventnode-opc-ua-baseeventstate-opc-uafx-opcnodemodel)<span class="api-meta">protected · since v2.50</span> | Initializes a new instance of the [OpcEventNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opceventnode/) class using the `content` as the instance to wrap. |
| [OpcEventNode(OpcNodeModel, OpcName)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opceventnode/members#opceventnode-opc-uafx-opcnodemodel-opc-uafx-opcname)<span class="api-meta">protected · since v2.50</span> | Initializes a new instance of the [OpcEventNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opceventnode/) class accessible by the `name` specified. |
| [OpcEventNode(OpcNodeModel, OpcName, OpcNodeId)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opceventnode/members#opceventnode-opc-uafx-opcnodemodel-opc-uafx-opcname-opc-uafx-opcnodeid)<span class="api-meta">protected · since v2.50</span> | Initializes a new instance of the [OpcEventNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opceventnode/) class accessible by the `name` and `id` specified. |
| [OpcEventNode(OpcNodeModel, IOpcNode, OpcName)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opceventnode/members#opceventnode-opc-uafx-opcnodemodel-opc-uafx-iopcnode-opc-uafx-opcname)<span class="api-meta">protected · since v2.50</span> | Initializes a new instance of the [OpcEventNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opceventnode/) class accessible by the `name` specified as a child node of the `parent` node given. |
| [OpcEventNode(OpcNodeModel, IOpcNode, OpcName, OpcNodeId)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opceventnode/members#opceventnode-opc-uafx-opcnodemodel-opc-uafx-iopcnode-opc-uafx-opcname-opc-uafx-opcnodeid)<span class="api-meta">protected · since v2.50</span> | Initializes a new instance of the [OpcEventNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opceventnode/) class accessible by the `name` and `id` specified as a child node of the `parent` node given. |

#### OpcEventNode(OpcName)

Initializes a new instance of the [OpcEventNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opceventnode/) class accessible by the `name` specified.

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

```csharp
public OpcEventNode(OpcName name)
```

</div>

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

```vbnet
Public Sub New(name As OpcName)
```

</div>

**Parameters**

| Name | Type | Description |
|---|---|---|
| `name` | [OpcName](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcname/) | The [OpcName](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcname/) through that the new event node can be accessed. |

#### OpcEventNode(OpcName, OpcNodeId)

Initializes a new instance of the [OpcEventNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opceventnode/) class accessible by the `name` and `id` specified.

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

```csharp
public OpcEventNode(OpcName name, OpcNodeId id)
```

</div>

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

```vbnet
Public Sub New(name As OpcName, id As OpcNodeId)
```

</div>

**Parameters**

| Name | Type | Description |
|---|---|---|
| `name` | [OpcName](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcname/) | The [OpcName](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcname/) through that the new event node can be accessed. |
| `id` | [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/) through that the new event node can be identified and accessed. |

#### OpcEventNode(IOpcNode, OpcName)

Initializes a new instance of the [OpcEventNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opceventnode/) class accessible by the `name` specified as a child node of the `parent` node given.

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

```csharp
public OpcEventNode(IOpcNode parent, OpcName name)
```

</div>

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

```vbnet
Public Sub New(parent As IOpcNode, name As OpcName)
```

</div>

**Parameters**

| Name | Type | Description |
|---|---|---|
| `parent` | [IOpcNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcnode/) | The [IOpcNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcnode/) used as the parent node or a null reference (Nothing in Visual Basic) in the case there is no parent node available. |
| `name` | [OpcName](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcname/) | The [OpcName](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcname/) through that the new event node can be accessed. |

#### OpcEventNode(IOpcNode, OpcName, OpcNodeId)

Initializes a new instance of the [OpcEventNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opceventnode/) class accessible by the `name` and `id` specified as a child node of the `parent` node given.

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

```csharp
public OpcEventNode(IOpcNode parent, OpcName name, OpcNodeId id)
```

</div>

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

```vbnet
Public Sub New(parent As IOpcNode, name As OpcName, id As OpcNodeId)
```

</div>

**Parameters**

| Name | Type | Description |
|---|---|---|
| `parent` | [IOpcNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcnode/) | The [IOpcNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcnode/) used as the parent node or a null reference (Nothing in Visual Basic) in the case there is no parent node available. |
| `name` | [OpcName](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcname/) | The [OpcName](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcname/) through that the new event node can be accessed. |
| `id` | [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/) through that the new event node can be identified and accessed. |

#### OpcEventNode(BaseEventState)

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

Initializes a new instance of the [OpcEventNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opceventnode/) class using the `content` as the instance to wrap.

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

```csharp
protected OpcEventNode(BaseEventState content)
```

</div>

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

```vbnet
Protected Sub New(content As BaseEventState)
```

</div>

**Parameters**

| Name | Type | Description |
|---|---|---|
| `content` | <abbr title="OPC Foundation stack type, not documented here: Opc.Ua.BaseEventState">BaseEventState</abbr> | The <abbr title="OPC Foundation stack type, not documented here: Opc.Ua.BaseEventState">BaseEventState</abbr> to wrap. |

**Exceptions**

| Exception | Condition |
|---|---|
| [ArgumentNullException](https://learn.microsoft.com/dotnet/api/system.argumentnullexception) | The `content` is a null reference (Nothing in Visual Basic). |

#### OpcEventNode(BaseEventState, OpcNodeModel)

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

Initializes a new instance of the [OpcEventNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opceventnode/) class using the `content` as the instance to wrap.

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

```csharp
protected OpcEventNode(BaseEventState content, OpcNodeModel model)
```

</div>

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

```vbnet
Protected Sub New(content As BaseEventState, model As OpcNodeModel)
```

</div>

**Parameters**

| Name | Type | Description |
|---|---|---|
| `content` | <abbr title="OPC Foundation stack type, not documented here: Opc.Ua.BaseEventState">BaseEventState</abbr> | The <abbr title="OPC Foundation stack type, not documented here: Opc.Ua.BaseEventState">BaseEventState</abbr> to wrap. |
| `model` | [OpcNodeModel](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodemodel/) | The [OpcNodeModel](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodemodel/) which defines the modelling directives for the new node or a null reference (Nothing in Visual Basic) if there are no directives are to be applied to the node. |

**Exceptions**

| Exception | Condition |
|---|---|
| [ArgumentNullException](https://learn.microsoft.com/dotnet/api/system.argumentnullexception) | The `content` is a null reference (Nothing in Visual Basic). |

#### OpcEventNode(OpcNodeModel, OpcName)

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

Initializes a new instance of the [OpcEventNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opceventnode/) class accessible by the `name` specified.

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

```csharp
protected OpcEventNode(OpcNodeModel model, OpcName name)
```

</div>

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

```vbnet
Protected Sub New(model As OpcNodeModel, name As OpcName)
```

</div>

**Parameters**

| Name | Type | Description |
|---|---|---|
| `model` | [OpcNodeModel](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodemodel/) | The [OpcNodeModel](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodemodel/) which defines the modelling directives for the new node or a null reference (Nothing in Visual Basic) if there are no directives are to be applied to the node. |
| `name` | [OpcName](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcname/) | The [OpcName](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcname/) through that the new event node can be accessed. |

#### OpcEventNode(OpcNodeModel, OpcName, OpcNodeId)

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

Initializes a new instance of the [OpcEventNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opceventnode/) class accessible by the `name` and `id` specified.

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

```csharp
protected OpcEventNode(OpcNodeModel model, OpcName name, OpcNodeId id)
```

</div>

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

```vbnet
Protected Sub New(model As OpcNodeModel, name As OpcName, id As OpcNodeId)
```

</div>

**Parameters**

| Name | Type | Description |
|---|---|---|
| `model` | [OpcNodeModel](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodemodel/) | The [OpcNodeModel](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodemodel/) which defines the modelling directives for the new node or a null reference (Nothing in Visual Basic) if there are no directives are to be applied to the node. |
| `name` | [OpcName](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcname/) | The [OpcName](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcname/) through that the new event node can be accessed. |
| `id` | [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/) through that the new event node can be identified and accessed. |

#### OpcEventNode(OpcNodeModel, IOpcNode, OpcName)

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

Initializes a new instance of the [OpcEventNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opceventnode/) class accessible by the `name` specified as a child node of the `parent` node given.

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

```csharp
protected OpcEventNode(OpcNodeModel model, IOpcNode parent, OpcName name)
```

</div>

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

```vbnet
Protected Sub New(model As OpcNodeModel, parent As IOpcNode, name As OpcName)
```

</div>

**Parameters**

| Name | Type | Description |
|---|---|---|
| `model` | [OpcNodeModel](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodemodel/) | The [OpcNodeModel](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodemodel/) which defines the modelling directives for the new node or a null reference (Nothing in Visual Basic) if there are no directives are to be applied to the node. |
| `parent` | [IOpcNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcnode/) | The [IOpcNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcnode/) used as the parent node or a null reference (Nothing in Visual Basic) in the case there is no parent node available. |
| `name` | [OpcName](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcname/) | The [OpcName](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcname/) through that the new event node can be accessed. |

#### OpcEventNode(OpcNodeModel, IOpcNode, OpcName, OpcNodeId)

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

Initializes a new instance of the [OpcEventNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opceventnode/) class accessible by the `name` and `id` specified as a child node of the `parent` node given.

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

```csharp
protected OpcEventNode(
    OpcNodeModel model,
    IOpcNode parent,
    OpcName name,
    OpcNodeId id)
```

</div>

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

```vbnet
Protected Sub New(
    model As OpcNodeModel,
    parent As IOpcNode,
    name As OpcName,
    id As OpcNodeId)
```

</div>

**Parameters**

| Name | Type | Description |
|---|---|---|
| `model` | [OpcNodeModel](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodemodel/) | The [OpcNodeModel](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodemodel/) which defines the modelling directives for the new node or a null reference (Nothing in Visual Basic) if there are no directives are to be applied to the node. |
| `parent` | [IOpcNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcnode/) | The [IOpcNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcnode/) used as the parent node or a null reference (Nothing in Visual Basic) in the case there is no parent node available. |
| `name` | [OpcName](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcname/) | The [OpcName](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcname/) through that the new event node can be accessed. |
| `id` | [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/) through that the new event node can be identified and accessed. |

## Properties

### DefaultTypeDefinitionId

<span class="api-meta">protected · override</span>

Gets the default identifier which identifies the node that defines the underlying node type from that this [OpcInstanceNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcinstancenode/) has been created.

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

```csharp
protected override OpcNodeId DefaultTypeDefinitionId { get; }
```

</div>

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

```vbnet
Protected Overrides ReadOnly Property DefaultTypeDefinitionId As OpcNodeId
```

</div>

**Property 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/) of the type node from that this [OpcInstanceNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcinstancenode/) has been created from. These type node defines the typical structure of an instance node of its type definition. If there exists no specific type definition node a null reference (Nothing in Visual Basic).

**Overrides**

[DefaultTypeDefinitionId](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcobjectnode/members#defaulttypedefinitionid)

### EventId

Gets or sets a value generated by the server to uniquely identify a particular event notification.

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

```csharp
public byte[] EventId { get; set; }
```

</div>

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

```vbnet
Public Property EventId As Byte()
```

</div>

**Property value**

[Byte](https://learn.microsoft.com/dotnet/api/system.byte)[]

The server is responsible to ensure that each event has its unique event identifier. It may do this, for example, by putting GUIDs into the ByteString. Clients can use the event identifier to assist in minimizing or eliminating gaps and overlaps that may occur during a redundancy failover. The event identifier shall always be returned as value and the server is not allowed to return a status code for the event identifier indicating an error.

### EventIdNode

Gets the [OpcPropertyNode&lt;T&gt;](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcpropertynode-1/) of the [EventId](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opceventnode/members#eventid) property.

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

```csharp
public OpcPropertyNode<byte[]> EventIdNode { get; }
```

</div>

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

```vbnet
Public ReadOnly Property EventIdNode As OpcPropertyNode(Of Byte())
```

</div>

**Property value**

[OpcPropertyNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcpropertynode-1/)&lt;[Byte](https://learn.microsoft.com/dotnet/api/system.byte)[]&gt;

An instance of the [OpcPropertyNode&lt;T&gt;](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcpropertynode-1/) class.

### EventTypeId

Gets or sets the node identifier which describes the specific type of event.

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

```csharp
public OpcNodeId EventTypeId { get; set; }
```

</div>

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

```vbnet
Public Property EventTypeId As OpcNodeId
```

</div>

**Property value**

[OpcNodeId](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeid/)

The event type shall always be returned as value and the server is not allowed to return a status code for the event type indicating an error.

### EventTypeIdNode

Gets the [OpcNodeIdPropertyNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeidpropertynode/) of the [EventTypeId](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opceventnode/members#eventtypeid) property.

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

```csharp
public OpcNodeIdPropertyNode EventTypeIdNode { get; }
```

</div>

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

```vbnet
Public ReadOnly Property EventTypeIdNode As OpcNodeIdPropertyNode
```

</div>

**Property value**

[OpcNodeIdPropertyNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeidpropertynode/)

An instance of the [OpcNodeIdPropertyNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeidpropertynode/) class.

### Message

Gets or sets a value which defines a human-readable and localizable text description of the event.

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

```csharp
public OpcText Message { get; set; }
```

</div>

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

```vbnet
Public Property Message As OpcText
```

</div>

**Property value**

[OpcText](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opctext/)

The server may return any appropriate text to describe the event. A null reference (Nothing in Visual Basic) if it is not a valid value; if the server does not have a description, it shall return the string part of the [Name](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnode/members#name) of the node associated with the event.

### MessageNode

Gets the [OpcTextPropertyNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opctextpropertynode/) of the [Message](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opceventnode/members#message) property.

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

```csharp
public OpcTextPropertyNode MessageNode { get; }
```

</div>

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

```vbnet
Public ReadOnly Property MessageNode As OpcTextPropertyNode
```

</div>

**Property value**

[OpcTextPropertyNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opctextpropertynode/)

An instance of the [OpcTextPropertyNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opctextpropertynode/) class.

### ReceiveTime

Gets or sets the time the OPC UA server received the event from the underlying device of another server.

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

```csharp
public DateTime ReceiveTime { get; set; }
```

</div>

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

```vbnet
Public Property ReceiveTime As Date
```

</div>

**Property value**

[DateTime](https://learn.microsoft.com/dotnet/api/system.datetime)

The [ReceiveTime](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opceventnode/members#receivetime) is analogous to the ServerTimestamp, i.e. in the case where the OPC UA server gets an event from another OPC UA server, each server applies its own [ReceiveTime](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opceventnode/members#receivetime). That implies that a client may get the same event, having the same [EventId](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opceventnode/members#eventid), from different servers having different values of the [ReceiveTime](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opceventnode/members#receivetime). The [ReceiveTime](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opceventnode/members#receivetime) shall always be returned as value and the server is not allowed to return a status code for the [ReceiveTime](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opceventnode/members#receivetime) indicating an error.

### ReceiveTimeNode

Gets the [OpcPropertyNode&lt;T&gt;](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcpropertynode-1/) of the [ReceiveTime](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opceventnode/members#receivetime) property.

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

```csharp
public OpcPropertyNode<DateTime> ReceiveTimeNode { get; }
```

</div>

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

```vbnet
Public ReadOnly Property ReceiveTimeNode As OpcPropertyNode(Of Date)
```

</div>

**Property value**

[OpcPropertyNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcpropertynode-1/)&lt;[DateTime](https://learn.microsoft.com/dotnet/api/system.datetime)&gt;

An instance of the [OpcPropertyNode&lt;T&gt;](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcpropertynode-1/) class.

### Severity

Gets or sets an indication of the urgency of the event.

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

```csharp
public OpcEventSeverity Severity { get; set; }
```

</div>

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

```vbnet
Public Property Severity As OpcEventSeverity
```

</div>

**Property value**

[OpcEventSeverity](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opceventseverity/)

This value is commonly called "priority". Values will range from 1 to 1 000, with 1 being the lowest severity and 1 000 being the highest. Typically, a severity of 1 would indicate an event which is informational in nature, while a value of 1 000 would indicate an event of catastrophic nature, which could potentially result in severe financial loss or loss of life.

**Remarks**

It is expected that very few server implementations will support 1 000 distinct severity levels. Therefore, server developers are responsible for distributing their severity levels across the 1 to 1 000 range in such a manner that clients can assume a linear distribution.

In many cases a strict linear mapping of underlying source severities to the OPC severity range is not appropriate. The server developer will instead intelligently map the underlying source severities to the 1 to 1 000 OPC severity range in some other fashion. In particular, it is recommended that server developers map events of high urgency into the OPC severity range of 667 to 1 000, events of medium urgency into the OPC severity range of 334 to 666 and events of low urgency into OPC severities of 1 to 333.

Some servers might not support any events which are catastrophic in nature, so they may choose to map all of their severities into a subset of the 1 to 1 000 range (for example, 1 to 666). Other servers might not support any events which are merely informational, so they may choose to map all of their severities into a different subset of the 1 to 1 000 range (for example, 334 to 1 000).

The purpose of this approach is to allow clients to use severity values from multiple servers from different vendors in a consistent manner.

### SeverityNode

Gets the [OpcPropertyNode&lt;T&gt;](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcpropertynode-1/) of the [Severity](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opceventnode/members#severity) property.

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

```csharp
public OpcPropertyNode<ushort> SeverityNode { get; }
```

</div>

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

```vbnet
<CLSCompliant(False)>
Public ReadOnly Property SeverityNode As OpcPropertyNode(Of UShort)
```

</div>

**Property value**

[OpcPropertyNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcpropertynode-1/)&lt;[UInt16](https://learn.microsoft.com/dotnet/api/system.uint16)&gt;

An instance of the [OpcPropertyNode&lt;T&gt;](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcpropertynode-1/) class.

### SourceName

Gets or sets a description of the source of the event.

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

```csharp
public string SourceName { get; set; }
```

</div>

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

```vbnet
Public Property SourceName As String
```

</div>

**Property value**

[String](https://learn.microsoft.com/dotnet/api/system.string)

A value which can be a string-part of the [DisplayName](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnode/members#displayname) of the event source using the default locale of the server, if the event is specific to a node, or some server-specific notation.

### SourceNameNode

Gets the [OpcPropertyNode&lt;T&gt;](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcpropertynode-1/) of the [SourceName](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opceventnode/members#sourcename) property.

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

```csharp
public OpcPropertyNode<string> SourceNameNode { get; }
```

</div>

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

```vbnet
Public ReadOnly Property SourceNameNode As OpcPropertyNode(Of String)
```

</div>

**Property value**

[OpcPropertyNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcpropertynode-1/)&lt;[String](https://learn.microsoft.com/dotnet/api/system.string)&gt;

An instance of the [OpcPropertyNode&lt;T&gt;](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcpropertynode-1/) class.

### SourceNodeId

Gets or sets the node identifier which identifies the node that the event originated from.

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

```csharp
public OpcNodeId SourceNodeId { get; set; }
```

</div>

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

```vbnet
Public Property SourceNodeId As OpcNodeId
```

</div>

**Property value**

[OpcNodeId](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeid/)

If the event is not specific to a node the value is a null reference (Nothing in Visual Basic); otherwise the [OpcNodeId](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeid/) of the node that the event originated from. Some subtypes of this [OpcEventNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opceventnode/) may define additional rules for the [SourceNodeId](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opceventnode/members#sourcenodeid).

### SourceNodeIdNode

Gets the [OpcNodeIdPropertyNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeidpropertynode/) of the [SourceNodeId](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opceventnode/members#sourcenodeid) property.

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

```csharp
public OpcNodeIdPropertyNode SourceNodeIdNode { get; }
```

</div>

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

```vbnet
Public ReadOnly Property SourceNodeIdNode As OpcNodeIdPropertyNode
```

</div>

**Property value**

[OpcNodeIdPropertyNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeidpropertynode/)

An instance of the [OpcNodeIdPropertyNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeidpropertynode/) class.

### Time

Gets or sets the time the event occurred.

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

```csharp
public DateTime Time { get; set; }
```

</div>

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

```vbnet
Public Property Time As Date
```

</div>

**Property value**

[DateTime](https://learn.microsoft.com/dotnet/api/system.datetime)

This value is set as close to the event generator as possible. It often comes from the underlying system or device. Once set, intermediate OPC UA servers shall not alter the value.

### TimeNode

Gets the [OpcPropertyNode&lt;T&gt;](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcpropertynode-1/) of the [Time](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opceventnode/members#time) property.

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

```csharp
public OpcPropertyNode<DateTime> TimeNode { get; }
```

</div>

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

```vbnet
Public ReadOnly Property TimeNode As OpcPropertyNode(Of Date)
```

</div>

**Property value**

[OpcPropertyNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcpropertynode-1/)&lt;[DateTime](https://learn.microsoft.com/dotnet/api/system.datetime)&gt;

An instance of the [OpcPropertyNode&lt;T&gt;](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcpropertynode-1/) class.

## Methods

### CreateEvent

Creates a new instance of the [OpcEvent](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcevent/) class which represents a snapshot of this [OpcEventNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opceventnode/).

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

```csharp
public OpcEvent CreateEvent(OpcContext context)
```

</div>

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

```vbnet
Public Function CreateEvent(context As OpcContext) As OpcEvent
```

</div>

**Parameters**

| Name | Type | Description |
|---|---|---|
| `context` | [OpcContext](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opccontext/) | The [OpcContext](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opccontext/) to use. |

**Returns**

[OpcEvent](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcevent/)

A new immutable instance of the [OpcEvent](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcevent/) class representing a snapshot of the event node data at the time this method has been called.

### CreateEventCore

<span class="api-meta">protected · virtual</span>

Creates a new instance of the [OpcEvent](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcevent/) class representing the specified `snapshot` of this [OpcEventNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opceventnode/).

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

```csharp
protected virtual OpcEvent CreateEventCore(
    OpcContext context,
    OpcEventNodeSnapshot snapshot)
```

</div>

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

```vbnet
Protected Overridable Function CreateEventCore(
    context As OpcContext,
    snapshot As OpcEventNodeSnapshot) As OpcEvent
```

</div>

**Parameters**

| Name | Type | Description |
|---|---|---|
| `context` | [OpcContext](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opccontext/) | The [OpcContext](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opccontext/) used to create the `snapshot`. |
| `snapshot` | [OpcEventNodeSnapshot](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opceventnodesnapshot/) | The [OpcEventNodeSnapshot](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opceventnodesnapshot/) taken from the current state of this [OpcEventNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opceventnode/) from that the new [OpcEvent](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcevent/) is to be created. |

**Returns**

[OpcEvent](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcevent/)

A new instance of the [OpcEvent](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcevent/) representing an immutable `snapshot` of this [OpcEventNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opceventnode/).

**Remarks**

In case there this method is not overridden the method will determine the type of [OpcEvent](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcevent/) to use using the [OpcEventTypeAttribute](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opceventtypeattribute/) of the [OpcEventNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opceventnode/) and will use this one to create a new [OpcEvent](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcevent/) using the `snapshot` specified.

### InitializeDefaults

<span class="api-meta">protected · override</span>

Initializes the default values used by the [OpcEventNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opceventnode/).

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

```csharp
protected override void InitializeDefaults()
```

</div>

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

```vbnet
Protected Overrides Sub InitializeDefaults()
```

</div>

**Overrides**

[InitializeDefaults](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcinstancenode/members#initializedefaults)

**Remarks**

This method is used to ensure the availability of appropriate node specific default values. For more information like when this method is to be overwritten see [InitializeDefaults](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnode/members#initializedefaults).

### PrepareEventSnapshot

<span class="api-meta">protected · virtual · since v2.22</span>

Prepares the [OpcEventNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opceventnode/) for a new [OpcEventNodeSnapshot](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opceventnodesnapshot/).

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

```csharp
protected virtual void PrepareEventSnapshot(OpcContext context)
```

</div>

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

```vbnet
Protected Overridable Sub PrepareEventSnapshot(context As OpcContext)
```

</div>

**Parameters**

| Name | Type | Description |
|---|---|---|
| `context` | [OpcContext](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opccontext/) | The [OpcContext](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opccontext/) used to prepare the current [OpcEventNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opceventnode/). |

### ReportEvent

Produces an event using the data represented by this [OpcEventNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opceventnode/).

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

```csharp
public void ReportEvent(OpcContext context)
```

</div>

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

```vbnet
Public Sub ReportEvent(context As OpcContext)
```

</div>

**Parameters**

| Name | Type | Description |
|---|---|---|
| `context` | [OpcContext](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opccontext/) | The [OpcContext](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opccontext/) to use. |

**Exceptions**

| Exception | Condition |
|---|---|
| [ArgumentNullException](https://learn.microsoft.com/dotnet/api/system.argumentnullexception) | The `context` is a null reference (Nothing in Visual Basic). |

**Remarks**

The method applies the pending changes of the event node first and is not synchronized, see [ApplyChanges](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnode/members#applychanges-opc-uafx-opccontext-system-boolean). Report an event node from one thread at a time. Reporting locks the node manager of every notifier the event passes, one after the other.

### ReportEventFrom

Produces an event using the data represented by this [OpcEventNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opceventnode/) using the `source` as initiator of the event reported.

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

```csharp
public void ReportEventFrom(OpcContext context, IOpcNode source)
```

</div>

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

```vbnet
Public Sub ReportEventFrom(context As OpcContext, source As IOpcNode)
```

</div>

**Parameters**

| Name | Type | Description |
|---|---|---|
| `context` | [OpcContext](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opccontext/) | The [OpcContext](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opccontext/) to use. |
| `source` | [IOpcNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcnode/) | The [IOpcNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcnode/) instance its [Id](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcnodeinfo/members#id) is used for the [SourceNodeId](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opceventnode/members#sourcenodeid) property and its [SymbolicName](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcnodeinfo/members#symbolicname) is used for the [SourceName](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opceventnode/members#sourcename) property to define the origin of the event produced. |

**Exceptions**

| Exception | Condition |
|---|---|
| [ArgumentNullException](https://learn.microsoft.com/dotnet/api/system.argumentnullexception) | The `context` or `source` is a null reference (Nothing in Visual Basic). |

**Remarks**

The method sets the source of the event node and is not synchronized, see [ReportEvent](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opceventnode/members#reportevent).