WaitForMultiple(IEasyUAClient,IReadOnlyList<ValueTuple<UAMonitoredItemArguments,Func<EasyUADataChangeNotificationEventArgs,Boolean>>>) Method

Subscribes to the specified nodes&attributes, and monitors their data until the predicates specified for each item become true, or the alloted time elapses.

Syntax

Visual Basic
C#
C++/CLI

'Declaration
 
<ExtensionAttribute()>
<ElementsNotNullAttribute()>
<NotNullAttribute()>
Public Overloads Shared Function WaitForMultiple( _
   ByVal client As IEasyUAClient, _
   ByVal argumentsAndExitPredicateList As IReadOnlyList(Of ValueTuple(Of UAMonitoredItemArguments,Func(Of EasyUADataChangeNotificationEventArgs,Boolean))) _
) As UAAttributeDataResult()

'Usage
 
Dim client As IEasyUAClient
Dim argumentsAndExitPredicateList As IReadOnlyList(Of ValueTuple(Of UAMonitoredItemArguments,Func(Of EasyUADataChangeNotificationEventArgs,Boolean)))
Dim value() As UAAttributeDataResult
 
value = IEasyUAClientExtension2.WaitForMultiple(client, argumentsAndExitPredicateList)

[Extension()]
[ElementsNotNull()]
[NotNull()]
public static UAAttributeDataResult[] WaitForMultiple( 
   IEasyUAClient client,
   IReadOnlyList<ValueTuple<UAMonitoredItemArguments,Func<EasyUADataChangeNotificationEventArgs,bool>>> argumentsAndExitPredicateList
)

[Extension()]
[ElementsNotNull()]
[NotNull()]
public:
static array<UAAttributeDataResult^>^ WaitForMultiple( 
   IEasyUAClient^ client,
   IReadOnlyList<ValueTuple<UAMonitoredItemArguments^,Func<EasyUADataChangeNotificationEventArgs^,bool>^>>^ argumentsAndExitPredicateList
)

Parameters

client: The client object that will perform the operation.
argumentsAndExitPredicateList: List of tuples, where each tuple consists of OPC-UA monitored item arguments, and a predicate on OpcLabs.EasyOpc.UA.OperationModel.EasyUADataChangeNotificationEventArgs determining when the wait is complete.

Return Value

The function returns an array of OpcLabs.EasyOpc.UA.OperationModel.UAAttributeDataResult objects. The indices of elements in the output array are the same as those in the input list, .

Exceptions

Exception Description

Exception	Description
System.ArgumentNullException	A `null` reference (`Nothing` in Visual Basic) is passed to a method that does not accept it as a valid argument. This is a usage error, i.e. it will never occur (the exception will not be thrown) in a correctly written program. Your code should not catch this exception.

System.ArgumentNullException

A null reference (Nothing in Visual Basic) is passed to a method that does not accept it as a valid argument.

This is a usage error, i.e. it will never occur (the exception will not be thrown) in a correctly written program. Your code should not catch this exception.

Requirements

Target Platforms: .NET Framework: Windows 10 (selected versions), Windows 11 (selected versions), Windows Server 2016, Windows Server 2022; .NET: Linux, macOS, Microsoft Windows

Reference

IEasyUAClientExtension2 Class
IEasyUAClientExtension2 Members
Overload List

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