EasyUA Reference
HistoryReadAtTime(IList<HistoryReadValueId>,ReadAtTimeDetails) Method
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EasyUA Assembly > Advosol.EasyUA Namespace > Session Class > HistoryReadAtTime Method : HistoryReadAtTime(IList<HistoryReadValueId>,ReadAtTimeDetails) Method

Visual Basic (Usage)
C#

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

Reads the history of item values synchronously from the OPC server for the given timestamps.

Syntax

Visual Basic (Usage)	Copy Code
Dim instance As Session Dim nodesToRead As IList(Of HistoryReadValueId) Dim details As ReadAtTimeDetails Dim value As List(Of HistoryDataReadResult) value = instance.HistoryReadAtTime(nodesToRead, details)

Visual Basic (Usage)

Copy Code

Dim instance As Session
Dim nodesToRead As IList(Of HistoryReadValueId)
Dim details As ReadAtTimeDetails
Dim value As List(Of HistoryDataReadResult)
 
value = instance.HistoryReadAtTime(nodesToRead, details)

C#
public List<HistoryDataReadResult> HistoryReadAtTime( IList<HistoryReadValueId> nodesToRead, ReadAtTimeDetails details )

public List<HistoryDataReadResult> HistoryReadAtTime( 
   IList<HistoryReadValueId> nodesToRead,
   ReadAtTimeDetails details
)

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

Return Value

Result data for the requested nodes and time stamps.

Requirements

Target Platforms: Windows 7/8/10, Windows Server 2003/2008/2012/2015, .NET4.x

Syntax

Parameters

Return Value

Requirements

See Also

Reference