# OpcClient.ReadNodesHistoryAtTime Method

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

<span class="api-meta">12 overloads</span>

| Overload | Description |
|---|---|
| [ReadNodesHistoryAtTime(DateTime, IEnumerable&lt;OpcNodeId&gt;)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcclient/readnodeshistoryattime#readnodeshistoryattime-system-datetime-system-collections-generic-ienumerable-of-opc-uafx-opcnodeid) |  |
| [ReadNodesHistoryAtTime(DateTime, params OpcNodeId\[\])](#readnodeshistoryattime-system-datetime-opc-uafx-opcnodeid-array) |  |
| [ReadNodesHistoryAtTime(DateTime\[\], IEnumerable&lt;OpcNodeId&gt;)](#readnodeshistoryattime-system-datetime-array-system-collections-generic-ienumerable-of-opc-uafx-opcnodeid) |  |
| [ReadNodesHistoryAtTime(DateTime\[\], params OpcNodeId\[\])](#readnodeshistoryattime-system-datetime-array-opc-uafx-opcnodeid-array) |  |
| [ReadNodesHistoryAtTime(IEnumerable&lt;DateTime&gt;, IEnumerable&lt;OpcNodeId&gt;)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcclient/readnodeshistoryattime#readnodeshistoryattime-system-collections-generic-ienumerable-of-system-datetime-system-collections-generic-ienumerable-of-opc-uafx-opcnodeid) |  |
| [ReadNodesHistoryAtTime(IEnumerable&lt;DateTime&gt;, params OpcNodeId\[\])](#readnodeshistoryattime-system-collections-generic-ienumerable-of-system-datetime-opc-uafx-opcnodeid-array) |  |
| [ReadNodesHistoryAtTime(DateTime, IEnumerable&lt;OpcReadNodeHistory&gt;)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcclient/readnodeshistoryattime#readnodeshistoryattime-system-datetime-system-collections-generic-ienumerable-of-opc-uafx-client-opcreadnodehistory) |  |
| [ReadNodesHistoryAtTime(DateTime, params OpcReadNodeHistory\[\])](#readnodeshistoryattime-system-datetime-opc-uafx-client-opcreadnodehistory-array) |  |
| [ReadNodesHistoryAtTime(DateTime\[\], IEnumerable&lt;OpcReadNodeHistory&gt;)](#readnodeshistoryattime-system-datetime-array-system-collections-generic-ienumerable-of-opc-uafx-client-opcreadnodehistory) |  |
| [ReadNodesHistoryAtTime(DateTime\[\], params OpcReadNodeHistory\[\])](#readnodeshistoryattime-system-datetime-array-opc-uafx-client-opcreadnodehistory-array) |  |
| [ReadNodesHistoryAtTime(IEnumerable&lt;DateTime&gt;, IEnumerable&lt;OpcReadNodeHistory&gt;)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcclient/readnodeshistoryattime#readnodeshistoryattime-system-collections-generic-ienumerable-of-system-datetime-system-collections-generic-ienumerable-of-opc-uafx-client-opcreadnodehistory) |  |
| [ReadNodesHistoryAtTime(IEnumerable&lt;DateTime&gt;, params OpcReadNodeHistory\[\])](#readnodeshistoryattime-system-collections-generic-ienumerable-of-system-datetime-opc-uafx-client-opcreadnodehistory-array) |  |

**Exceptions (all overloads)**

| Exception | Condition |
|---|---|
| [ArgumentNullException](https://learn.microsoft.com/dotnet/api/system.argumentnullexception) |  |
| [InvalidOperationException](https://learn.microsoft.com/dotnet/api/system.invalidoperationexception) |  |
| [OpcException](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcexception/) |  |
| [ObjectDisposedException](https://learn.microsoft.com/dotnet/api/system.objectdisposedexception) |  |

## ReadNodesHistoryAtTime(DateTime, IEnumerable&lt;OpcNodeId&gt;)

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

```csharp
public IDictionary<OpcNodeId, OpcHistoryValue> ReadNodesHistoryAtTime(
    DateTime time,
    IEnumerable<OpcNodeId> nodeIds)
```

</div>

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

```vbnet
Public Function ReadNodesHistoryAtTime(
    time As Date,
    nodeIds As IEnumerable(Of OpcNodeId)) As IDictionary(Of OpcNodeId, OpcHistoryValue)
```

</div>

**Parameters**

| Name | Type | Description |
|---|---|---|
| `time` | [DateTime](https://learn.microsoft.com/dotnet/api/system.datetime) |  |
| `nodeIds` | [IEnumerable](https://learn.microsoft.com/dotnet/api/system.collections.generic.ienumerable-1)&lt;[OpcNodeId](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeid/)&gt; |  |

**Returns**

[IDictionary](https://learn.microsoft.com/dotnet/api/system.collections.generic.idictionary-2)&lt;[OpcNodeId](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeid/), [OpcHistoryValue](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opchistoryvalue/)&gt;

## ReadNodesHistoryAtTime(DateTime, params OpcNodeId\[\])

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

```csharp
public IDictionary<OpcNodeId, OpcHistoryValue> ReadNodesHistoryAtTime(
    DateTime time,
    params OpcNodeId[] nodeIds)
```

</div>

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

```vbnet
Public Function ReadNodesHistoryAtTime(
    time As Date,
    ParamArray nodeIds As OpcNodeId()) As IDictionary(Of OpcNodeId, OpcHistoryValue)
```

</div>

**Parameters**

| Name | Type | Description |
|---|---|---|
| `time` | [DateTime](https://learn.microsoft.com/dotnet/api/system.datetime) |  |
| `nodeIds` | params [OpcNodeId](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeid/)[] |  |

**Returns**

[IDictionary](https://learn.microsoft.com/dotnet/api/system.collections.generic.idictionary-2)&lt;[OpcNodeId](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeid/), [OpcHistoryValue](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opchistoryvalue/)&gt;

## ReadNodesHistoryAtTime(DateTime\[\], IEnumerable&lt;OpcNodeId&gt;)

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

```csharp
public IDictionary<OpcNodeId, IEnumerable<OpcHistoryValue>> ReadNodesHistoryAtTime(
    DateTime[] times,
    IEnumerable<OpcNodeId> nodeIds)
```

</div>

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

```vbnet
Public Function ReadNodesHistoryAtTime(
    times As Date(),
    nodeIds As IEnumerable(Of OpcNodeId)) As IDictionary(Of OpcNodeId, IEnumerable(Of OpcHistoryValue))
```

</div>

**Parameters**

| Name | Type | Description |
|---|---|---|
| `times` | [DateTime](https://learn.microsoft.com/dotnet/api/system.datetime)[] |  |
| `nodeIds` | [IEnumerable](https://learn.microsoft.com/dotnet/api/system.collections.generic.ienumerable-1)&lt;[OpcNodeId](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeid/)&gt; |  |

**Returns**

[IDictionary](https://learn.microsoft.com/dotnet/api/system.collections.generic.idictionary-2)&lt;[OpcNodeId](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeid/), [IEnumerable](https://learn.microsoft.com/dotnet/api/system.collections.generic.ienumerable-1)&lt;[OpcHistoryValue](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opchistoryvalue/)&gt;&gt;

## ReadNodesHistoryAtTime(DateTime\[\], params OpcNodeId\[\])

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

```csharp
public IDictionary<OpcNodeId, IEnumerable<OpcHistoryValue>> ReadNodesHistoryAtTime(
    DateTime[] times,
    params OpcNodeId[] nodeIds)
```

</div>

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

```vbnet
Public Function ReadNodesHistoryAtTime(
    times As Date(),
    ParamArray nodeIds As OpcNodeId()) As IDictionary(Of OpcNodeId, IEnumerable(Of OpcHistoryValue))
```

</div>

**Parameters**

| Name | Type | Description |
|---|---|---|
| `times` | [DateTime](https://learn.microsoft.com/dotnet/api/system.datetime)[] |  |
| `nodeIds` | params [OpcNodeId](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeid/)[] |  |

**Returns**

[IDictionary](https://learn.microsoft.com/dotnet/api/system.collections.generic.idictionary-2)&lt;[OpcNodeId](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeid/), [IEnumerable](https://learn.microsoft.com/dotnet/api/system.collections.generic.ienumerable-1)&lt;[OpcHistoryValue](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opchistoryvalue/)&gt;&gt;

## ReadNodesHistoryAtTime(IEnumerable&lt;DateTime&gt;, IEnumerable&lt;OpcNodeId&gt;)

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

```csharp
public IDictionary<OpcNodeId, IEnumerable<OpcHistoryValue>> ReadNodesHistoryAtTime(
    IEnumerable<DateTime> times,
    IEnumerable<OpcNodeId> nodeIds)
```

</div>

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

```vbnet
Public Function ReadNodesHistoryAtTime(
    times As IEnumerable(Of Date),
    nodeIds As IEnumerable(Of OpcNodeId)) As IDictionary(Of OpcNodeId, IEnumerable(Of OpcHistoryValue))
```

</div>

**Parameters**

| Name | Type | Description |
|---|---|---|
| `times` | [IEnumerable](https://learn.microsoft.com/dotnet/api/system.collections.generic.ienumerable-1)&lt;[DateTime](https://learn.microsoft.com/dotnet/api/system.datetime)&gt; |  |
| `nodeIds` | [IEnumerable](https://learn.microsoft.com/dotnet/api/system.collections.generic.ienumerable-1)&lt;[OpcNodeId](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeid/)&gt; |  |

**Returns**

[IDictionary](https://learn.microsoft.com/dotnet/api/system.collections.generic.idictionary-2)&lt;[OpcNodeId](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeid/), [IEnumerable](https://learn.microsoft.com/dotnet/api/system.collections.generic.ienumerable-1)&lt;[OpcHistoryValue](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opchistoryvalue/)&gt;&gt;

## ReadNodesHistoryAtTime(IEnumerable&lt;DateTime&gt;, params OpcNodeId\[\])

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

```csharp
public IDictionary<OpcNodeId, IEnumerable<OpcHistoryValue>> ReadNodesHistoryAtTime(
    IEnumerable<DateTime> times,
    params OpcNodeId[] nodeIds)
```

</div>

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

```vbnet
Public Function ReadNodesHistoryAtTime(
    times As IEnumerable(Of Date),
    ParamArray nodeIds As OpcNodeId()) As IDictionary(Of OpcNodeId, IEnumerable(Of OpcHistoryValue))
```

</div>

**Parameters**

| Name | Type | Description |
|---|---|---|
| `times` | [IEnumerable](https://learn.microsoft.com/dotnet/api/system.collections.generic.ienumerable-1)&lt;[DateTime](https://learn.microsoft.com/dotnet/api/system.datetime)&gt; |  |
| `nodeIds` | params [OpcNodeId](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeid/)[] |  |

**Returns**

[IDictionary](https://learn.microsoft.com/dotnet/api/system.collections.generic.idictionary-2)&lt;[OpcNodeId](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeid/), [IEnumerable](https://learn.microsoft.com/dotnet/api/system.collections.generic.ienumerable-1)&lt;[OpcHistoryValue](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opchistoryvalue/)&gt;&gt;

## ReadNodesHistoryAtTime(DateTime, IEnumerable&lt;OpcReadNodeHistory&gt;)

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

```csharp
public IDictionary<OpcNodeId, OpcHistoryValue> ReadNodesHistoryAtTime(
    DateTime time,
    IEnumerable<OpcReadNodeHistory> commands)
```

</div>

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

```vbnet
Public Function ReadNodesHistoryAtTime(
    time As Date,
    commands As IEnumerable(Of OpcReadNodeHistory)) As IDictionary(Of OpcNodeId, OpcHistoryValue)
```

</div>

**Parameters**

| Name | Type | Description |
|---|---|---|
| `time` | [DateTime](https://learn.microsoft.com/dotnet/api/system.datetime) |  |
| `commands` | [IEnumerable](https://learn.microsoft.com/dotnet/api/system.collections.generic.ienumerable-1)&lt;[OpcReadNodeHistory](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcreadnodehistory/)&gt; |  |

**Returns**

[IDictionary](https://learn.microsoft.com/dotnet/api/system.collections.generic.idictionary-2)&lt;[OpcNodeId](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeid/), [OpcHistoryValue](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opchistoryvalue/)&gt;

## ReadNodesHistoryAtTime(DateTime, params OpcReadNodeHistory\[\])

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

```csharp
public IDictionary<OpcNodeId, OpcHistoryValue> ReadNodesHistoryAtTime(
    DateTime time,
    params OpcReadNodeHistory[] commands)
```

</div>

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

```vbnet
Public Function ReadNodesHistoryAtTime(
    time As Date,
    ParamArray commands As OpcReadNodeHistory()) As IDictionary(Of OpcNodeId, OpcHistoryValue)
```

</div>

**Parameters**

| Name | Type | Description |
|---|---|---|
| `time` | [DateTime](https://learn.microsoft.com/dotnet/api/system.datetime) |  |
| `commands` | params [OpcReadNodeHistory](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcreadnodehistory/)[] |  |

**Returns**

[IDictionary](https://learn.microsoft.com/dotnet/api/system.collections.generic.idictionary-2)&lt;[OpcNodeId](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeid/), [OpcHistoryValue](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opchistoryvalue/)&gt;

## ReadNodesHistoryAtTime(DateTime\[\], IEnumerable&lt;OpcReadNodeHistory&gt;)

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

```csharp
public IDictionary<OpcNodeId, IEnumerable<OpcHistoryValue>> ReadNodesHistoryAtTime(
    DateTime[] times,
    IEnumerable<OpcReadNodeHistory> commands)
```

</div>

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

```vbnet
Public Function ReadNodesHistoryAtTime(
    times As Date(),
    commands As IEnumerable(Of OpcReadNodeHistory)) As IDictionary(Of OpcNodeId, IEnumerable(Of OpcHistoryValue))
```

</div>

**Parameters**

| Name | Type | Description |
|---|---|---|
| `times` | [DateTime](https://learn.microsoft.com/dotnet/api/system.datetime)[] |  |
| `commands` | [IEnumerable](https://learn.microsoft.com/dotnet/api/system.collections.generic.ienumerable-1)&lt;[OpcReadNodeHistory](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcreadnodehistory/)&gt; |  |

**Returns**

[IDictionary](https://learn.microsoft.com/dotnet/api/system.collections.generic.idictionary-2)&lt;[OpcNodeId](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeid/), [IEnumerable](https://learn.microsoft.com/dotnet/api/system.collections.generic.ienumerable-1)&lt;[OpcHistoryValue](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opchistoryvalue/)&gt;&gt;

## ReadNodesHistoryAtTime(DateTime\[\], params OpcReadNodeHistory\[\])

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

```csharp
public IDictionary<OpcNodeId, IEnumerable<OpcHistoryValue>> ReadNodesHistoryAtTime(
    DateTime[] times,
    params OpcReadNodeHistory[] commands)
```

</div>

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

```vbnet
Public Function ReadNodesHistoryAtTime(
    times As Date(),
    ParamArray commands As OpcReadNodeHistory()) As IDictionary(Of OpcNodeId, IEnumerable(Of OpcHistoryValue))
```

</div>

**Parameters**

| Name | Type | Description |
|---|---|---|
| `times` | [DateTime](https://learn.microsoft.com/dotnet/api/system.datetime)[] |  |
| `commands` | params [OpcReadNodeHistory](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcreadnodehistory/)[] |  |

**Returns**

[IDictionary](https://learn.microsoft.com/dotnet/api/system.collections.generic.idictionary-2)&lt;[OpcNodeId](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeid/), [IEnumerable](https://learn.microsoft.com/dotnet/api/system.collections.generic.ienumerable-1)&lt;[OpcHistoryValue](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opchistoryvalue/)&gt;&gt;

## ReadNodesHistoryAtTime(IEnumerable&lt;DateTime&gt;, IEnumerable&lt;OpcReadNodeHistory&gt;)

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

```csharp
public IDictionary<OpcNodeId, IEnumerable<OpcHistoryValue>> ReadNodesHistoryAtTime(
    IEnumerable<DateTime> times,
    IEnumerable<OpcReadNodeHistory> commands)
```

</div>

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

```vbnet
Public Function ReadNodesHistoryAtTime(
    times As IEnumerable(Of Date),
    commands As IEnumerable(Of OpcReadNodeHistory)) As IDictionary(Of OpcNodeId, IEnumerable(Of OpcHistoryValue))
```

</div>

**Parameters**

| Name | Type | Description |
|---|---|---|
| `times` | [IEnumerable](https://learn.microsoft.com/dotnet/api/system.collections.generic.ienumerable-1)&lt;[DateTime](https://learn.microsoft.com/dotnet/api/system.datetime)&gt; |  |
| `commands` | [IEnumerable](https://learn.microsoft.com/dotnet/api/system.collections.generic.ienumerable-1)&lt;[OpcReadNodeHistory](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcreadnodehistory/)&gt; |  |

**Returns**

[IDictionary](https://learn.microsoft.com/dotnet/api/system.collections.generic.idictionary-2)&lt;[OpcNodeId](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeid/), [IEnumerable](https://learn.microsoft.com/dotnet/api/system.collections.generic.ienumerable-1)&lt;[OpcHistoryValue](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opchistoryvalue/)&gt;&gt;

## ReadNodesHistoryAtTime(IEnumerable&lt;DateTime&gt;, params OpcReadNodeHistory\[\])

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

```csharp
public IDictionary<OpcNodeId, IEnumerable<OpcHistoryValue>> ReadNodesHistoryAtTime(
    IEnumerable<DateTime> times,
    params OpcReadNodeHistory[] commands)
```

</div>

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

```vbnet
Public Function ReadNodesHistoryAtTime(
    times As IEnumerable(Of Date),
    ParamArray commands As OpcReadNodeHistory()) As IDictionary(Of OpcNodeId, IEnumerable(Of OpcHistoryValue))
```

</div>

**Parameters**

| Name | Type | Description |
|---|---|---|
| `times` | [IEnumerable](https://learn.microsoft.com/dotnet/api/system.collections.generic.ienumerable-1)&lt;[DateTime](https://learn.microsoft.com/dotnet/api/system.datetime)&gt; |  |
| `commands` | params [OpcReadNodeHistory](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcreadnodehistory/)[] |  |

**Returns**

[IDictionary](https://learn.microsoft.com/dotnet/api/system.collections.generic.idictionary-2)&lt;[OpcNodeId](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeid/), [IEnumerable](https://learn.microsoft.com/dotnet/api/system.collections.generic.ienumerable-1)&lt;[OpcHistoryValue](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opchistoryvalue/)&gt;&gt;