# IOpcReadOnlyNodeDataStore Interface

> Reference: Defines read-only mechanisms to retrieve node related data using OPC UA defined techniques to store and locate information using different OpcAttribute's and OpcName's.

<span class="api-meta">since v2.8</span>

<dl class="api-definition">
<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>
<dt>Members</dt>
<dd><a href="./members">IOpcReadOnlyNodeDataStore Members</a></dd>
<dt>Also in</dt>
<dd>Opc.UaFx.Client</dd>
</dl>

Defines read-only mechanisms to retrieve node related data using OPC UA defined techniques to store and locate information using different [OpcAttribute](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/)'s and [OpcName](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcname/)'s.

## Syntax

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

```csharp
public interface IOpcReadOnlyNodeDataStore
```

</div>

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

```vbnet
Public Interface IOpcReadOnlyNodeDataStore
```

</div>

## Base interfaces

<ul class="api-implements">
<li><a href="../opc.uafx.iopcnamespaceresolver/">IOpcNamespaceResolver</a></li>
</ul>

## Derived types

- [OpcEventDataView](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opceventdataview/)
- [OpcEventNodeSnapshot](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opceventnodesnapshot/)
- [OpcEventNodeView](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opceventnodeview/)
- [OpcInstanceNodeSnapshot](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcinstancenodesnapshot/)

## Methods

| Name | Description |
|---|---|
| [Get](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcreadonlynodedatastore/members#get)<span class="api-meta">6 overloads</span> | Retrieves the [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/#value) attribute of the element browsable through the `name` specified. |
| [ToArray](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcreadonlynodedatastore/members#toarray)<span class="api-meta">since v2.54</span> | Copies the elements of this data store to a new array. |

Inherits members from [IOpcNamespaceResolver](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcnamespaceresolver/members).

## Applies to

| Package | Versions |
|---|---|
| Opc.UaFx.Advanced | v2.8–v2.59 |