WaitForMultiple(IEasyUAClient,IReadOnlyList<ValueTuple<UAMonitoredItemArguments,Func<EasyUADataChangeNotificationEventArgs,Boolean>>>,Int32) 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))), _
   ByVal millisecondsTimeout As Integer _
) As UAAttributeDataResult()

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

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

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

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.
millisecondsTimeout: The number of milliseconds to wait, or System.Threading.Timeout.Infinite to wait indefinitely.

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.ArgumentOutOfRangeException	The value of an argument is outside the allowable range of values as defined by the invoked method. 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.

System.ArgumentOutOfRangeException

The value of an argument is outside the allowable range of values as defined by the invoked method.

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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