# OpcReadEventsHistoryRequest Class

<span class="api-meta">since v2.54</span>

<dl class="api-definition">
<dt>Namespace</dt>
<dd><a href="../namespaces/opc.uafx.services">Opc.UaFx.Services</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">OpcReadEventsHistoryRequest Members</a></dd>
<dt>Also in</dt>
<dd>Opc.UaFx.Client</dd>
</dl>

Represents the request of the HistoryRead service of OPC UA, which reads the history of events of nodes.

## Syntax

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

```csharp
public class OpcReadEventsHistoryRequest : OpcServiceRequest<HistoryReadValueId, HistoryReadValueIdCollection>
```

</div>

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

```vbnet
<CLSCompliant(False)>
Public Class OpcReadEventsHistoryRequest
    Inherits OpcServiceRequest(Of HistoryReadValueId, HistoryReadValueIdCollection)
```

</div>

## Inheritance

[Object](https://learn.microsoft.com/dotnet/api/system.object) → [OpcServiceRequest](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.services.opcservicerequest/) → [OpcServiceRequest](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.services.opcservicerequest-2/)&lt;<abbr title="OPC Foundation stack type, not documented here: Opc.Ua.HistoryReadValueId">HistoryReadValueId</abbr>, <abbr title="OPC Foundation stack type, not documented here: Opc.Ua.HistoryReadValueIdCollection">HistoryReadValueIdCollection</abbr>&gt; → **OpcReadEventsHistoryRequest**

## Implements

<ul class="api-implements">
<li><a href="../opc.uafx.services.iopcservicerequest/">IOpcServiceRequest</a></li>
</ul>

## Constructors

| Name | Description |
|---|---|
| [OpcReadEventsHistoryRequest](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.services.opcreadeventshistoryrequest/members#opcreadeventshistoryrequest)<span class="api-meta">4 overloads</span> | Initializes a new instance of the OpcReadEventsHistoryRequest class using the specified `details` and `commands` and a new header. |

## Properties

| Name | Description |
|---|---|
| [Details](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.services.opcreadeventshistoryrequest/members#details) | Gets the details which specify the events to read. |
| [ReleaseContinuationPoints](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.services.opcreadeventshistoryrequest/members#releasecontinuationpoints) | Gets or sets a value indicating whether the continuation points of the commands are to be released. |
| [TimestampsToReturn](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.services.opcreadeventshistoryrequest/members#timestampstoreturn) | Gets or sets a value which specifies the timestamps to be returned for each requested [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/#value) attribute. |

Inherits members from [OpcServiceRequest&lt;HistoryReadValueId, HistoryReadValueIdCollection&gt;](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.services.opcservicerequest-2/members), [OpcServiceRequest](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.services.opcservicerequest/members).

## Applies to

| Package | Versions |
|---|---|
| Opc.UaFx.Advanced | v2.54–v2.59 |