QuickOPC User's Guide and Reference
WaitForMultipleItemValues(IEasyDAClient,IReadOnlyList<ValueTuple<DAItemGroupArguments,DAQuality>>) Method



OpcLabs.EasyOpcClassic Assembly > OpcLabs.EasyOpc.DataAccess.Extensions Namespace > IEasyDAClientExtension2 Class > WaitForMultipleItemValues Method : WaitForMultipleItemValues(IEasyDAClient,IReadOnlyList<ValueTuple<DAItemGroupArguments,DAQuality>>) Method
The client object that will perform the operation.
List of tuples, where each tuple consists of OPC-DA item group arguments, and a minimum quality determining when the wait is complete.
Subscribes to the specified OPC-DA items, and monitors their data until they have at least the quality specified for each item, an error occurs, or the alloted time elapses.
Syntax
'Declaration
 
<ExtensionAttribute()>
<ElementsNotNullAttribute()>
<NotNullAttribute()>
Public Overloads Shared Function WaitForMultipleItemValues( _
   ByVal client As IEasyDAClient, _
   ByVal argumentsAndMinimumQualityList As IReadOnlyList(Of ValueTuple(Of DAItemGroupArguments,DAQuality)) _
) As ValueResult()
'Usage
 
Dim client As IEasyDAClient
Dim argumentsAndMinimumQualityList As IReadOnlyList(Of ValueTuple(Of DAItemGroupArguments,DAQuality))
Dim value() As ValueResult
 
value = IEasyDAClientExtension2.WaitForMultipleItemValues(client, argumentsAndMinimumQualityList)
[Extension()]
[ElementsNotNull()]
[NotNull()]
public static ValueResult[] WaitForMultipleItemValues( 
   IEasyDAClient client,
   IReadOnlyList<ValueTuple<DAItemGroupArguments,DAQuality>> argumentsAndMinimumQualityList
)

Parameters

client
The client object that will perform the operation.
argumentsAndMinimumQualityList
List of tuples, where each tuple consists of OPC-DA item group arguments, and a minimum quality determining when the wait is complete.

Return Value

The function returns an array of OpcLabs.BaseLib.OperationModel.ValueResult objects. The indices of elements in the output array are the same as those in the input list, argumentsAndMinimumQualityList.
Exceptions
ExceptionDescription
A null reference (Nothing in Visual Basic) is passed to a method that does not accept it as a valid argument.
Requirements

Target Platforms: .NET Framework: Windows 10 (selected versions), Windows 11 (selected versions), Windows Server 2012, Windows Server 2016; .NET Core, .NET 5, .NET 6: Linux, macOS, Microsoft Windows

See Also

Reference

IEasyDAClientExtension2 Class
IEasyDAClientExtension2 Members
Overload List