Syntax
| Visual Basic (Usage) |  Copy Code |
|---|---|
Dim instance As Session Dim nodesToRead As IList(Of HistoryReadValueId) Dim details As ReadAtTimeDetails Dim callback As AsyncCallback Dim userData As Object Dim value As IAsyncResult value = instance.BeginHistoryReadAtTime(nodesToRead, details, callback, userData) | |
| C# | |
|---|---|
public IAsyncResult BeginHistoryReadAtTime( IList<HistoryReadValueId> nodesToRead, ReadAtTimeDetails details, AsyncCallback callback, object userData ) | |
Parameters
- nodesToRead
- List of variable nodes to read data values at specified timestamps from.
- details
- Configuration parameters for the history read of data at specified timestamps. Configuration parameters include - Array of timestamps for which values are to be read - Flag for bounding value calculation
- callback
- The callback to use when the async call completes.
- userData
- The user data that is passed to the callback.
Return Value
An object which must be passed to the EndHistoryReadAtTime() method.Requirements
Target Platforms: Windows 7/8/10, Windows Server 2003/2008/2012/2015, .NET4.x