# OpcNodeHistoryEventArgs<T> Class

> Reference: Provides the event data for the events Added, Removed and Replaced.

<dl class="api-definition">
<dt>Namespace</dt>
<dd><a href="../namespaces/opc.uafx.server">Opc.UaFx.Server</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">OpcNodeHistoryEventArgs&lt;T&gt; Members</a></dd>
</dl>

Provides the event data for the events [Added](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodehistory-1/members#added), [Removed](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodehistory-1/members#removed) and [Replaced](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodehistory-1/members#replaced).

## Syntax

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

```csharp
public class OpcNodeHistoryEventArgs<T> : EventArgs where T : OpcHistoryValue
```

</div>

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

```vbnet
Public Class OpcNodeHistoryEventArgs(Of T As OpcHistoryValue)
    Inherits EventArgs
```

</div>

## Type parameters

| Name | Description |
|---|---|
| `T` | The type of the values of the [OpcNodeHistory&lt;T&gt;](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodehistory-1/). |

## Inheritance

[Object](https://learn.microsoft.com/dotnet/api/system.object) → [EventArgs](https://learn.microsoft.com/dotnet/api/system.eventargs) → **OpcNodeHistoryEventArgs&lt;T&gt;**

## Constructors

| Name | Description |
|---|---|
| [OpcNodeHistoryEventArgs](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodehistoryeventargs-1/members#opcnodehistoryeventargs)<span class="api-meta">3 overloads</span> | Initializes a new instance of the OpcNodeHistoryEventArgs&lt;T&gt; class using the `value` specified. |

## Properties

| Name | Description |
|---|---|
| [Values](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodehistoryeventargs-1/members#values) | Gets the values concerned by the event. |

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

## Applies to

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