# OpcReadNodeHistoryDetails Class

<span class="api-meta">abstract</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">OpcReadNodeHistoryDetails Members</a></dd>
<dt>Also in</dt>
<dd>Opc.UaFx.Client</dd>
</dl>

Provides an abstract base class which defines the time domain, number of values and additional criteria to use to select values from historical database for one or more variables.

## Syntax

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

```csharp
public abstract class OpcReadNodeHistoryDetails : OpcReadHistoryDetails
```

</div>

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

```vbnet
Public MustInherit Class OpcReadNodeHistoryDetails
    Inherits OpcReadHistoryDetails
```

</div>

## Inheritance

[Object](https://learn.microsoft.com/dotnet/api/system.object) → [OpcReadHistoryDetails](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcreadhistorydetails/) → **OpcReadNodeHistoryDetails**

## Derived types

- [OpcReadNodeHistoryModifiedDetails](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcreadnodehistorymodifieddetails/)
- [OpcReadNodeHistoryRawDetails](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcreadnodehistoryrawdetails/)

## Constructors

| Name | Description |
|---|---|
| [OpcReadNodeHistoryDetails](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcreadnodehistorydetails/members#opcreadnodehistorydetails)<span class="api-meta">protected · 5 overloads</span> | Initializes a new instance of the OpcReadNodeHistoryDetails class using the specified `numberOfValues` to select the historical values. |

## Properties

| Name | Description |
|---|---|
| [EndTime](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcreadnodehistorydetails/members#endtime) | Gets or sets the end of the period to read. |
| [NumberOfValues](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcreadnodehistorydetails/members#numberofvalues) | Gets or sets the maximum number of values returned for any node over the time range. |
| [ReturnBounds](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcreadnodehistorydetails/members#returnbounds)<span class="api-meta">since v2.23</span> | Gets or sets a value indicating whether the bounding values should be returned. |
| [StartTime](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcreadnodehistorydetails/members#starttime) | Gets or sets the beginning of the period to read. |

## Applies to

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