# IOpcNodeHistoryProvider Interface

> Reference: Defines an interface which is to be used by an OpcNodeManager to provide and maintain historical values for an OpcVariableNode.

<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">IOpcNodeHistoryProvider Members</a></dd>
</dl>

Defines an interface which is to be used by an [OpcNodeManager](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodemanager/) to provide and maintain historical values for an [OpcVariableNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcvariablenode/).

## Syntax

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

```csharp
public interface IOpcNodeHistoryProvider
```

</div>

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

```vbnet
Public Interface IOpcNodeHistoryProvider
```

</div>

## Derived types

- [OpcNodeHistorian](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcnodehistorian/)

## Properties

| Name | Description |
|---|---|
| [Node](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.iopcnodehistoryprovider/members#node) | Gets the [OpcVariableNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcvariablenode/) for which this instance provides and maintains historical values. |

## Methods

| Name | Description |
|---|---|
| [CreateHistory](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.iopcnodehistoryprovider/members#createhistory) | Creates the history entries of the `values` specified. |
| [DeleteHistory](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.iopcnodehistoryprovider/members#deletehistory)<span class="api-meta">3 overloads</span> | Deletes the history entries at the `times` specified. |
| [ReadHistory](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.iopcnodehistoryprovider/members#readhistory)<span class="api-meta">since v2.51</span> | Reads the history of the values within the time range specified. |
| [ReplaceHistory](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.iopcnodehistoryprovider/members#replacehistory) | Replaces the existing history entries with the `values` specified. |
| [UpdateHistory](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.iopcnodehistoryprovider/members#updatehistory) | Updates the history entries of the `values` specified. |

## Applies to

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