# OpcReadNodesRequest Class

<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">OpcReadNodesRequest Members</a></dd>
<dt>Also in</dt>
<dd>Opc.UaFx.Client</dd>
</dl>

Represents the request of the Read service of OPC UA, which reads attributes of nodes.

## Syntax

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

```csharp
public class OpcReadNodesRequest : OpcServiceRequest<OpcReadNode, OpcReadNodeCollection>
```

</div>

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

```vbnet
<CLSCompliant(False)>
Public Class OpcReadNodesRequest
    Inherits OpcServiceRequest(Of OpcReadNode, OpcReadNodeCollection)
```

</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;[OpcReadNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcreadnode/), [OpcReadNodeCollection](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcreadnodecollection/)&gt; → **OpcReadNodesRequest**

## Implements

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

## Constructors

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

## Properties

| Name | Description |
|---|---|
| [MaxAge](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.services.opcreadnodesrequest/members#maxage) | Gets or sets the maximum age in milliseconds of the values to read. |
| [TimestampsToReturn](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.services.opcreadnodesrequest/members#timestampstoreturn) | Gets or sets which timestamps of the values are to be returned. |

## Methods

| Name | Description |
|---|---|
| [Validate](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.services.opcreadnodesrequest/members#validate)<span class="api-meta">protected · override · since v2.50</span> | Validates the request before a server processes it. |

Inherits members from [OpcServiceRequest&lt;OpcReadNode, OpcReadNodeCollection&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 | v2.5–v2.59 |