QuickOPC User's Guide and Reference
WaitForMultipleValues(IEasyUAClient,IReadOnlyList<UAMonitoredItemArguments>,UASeverity) Method



OpcLabs.EasyOpcUA Assembly > OpcLabs.EasyOpc.UA.Extensions Namespace > IEasyUAClientExtension2 Class > WaitForMultipleValues Method : WaitForMultipleValues(IEasyUAClient,IReadOnlyList<UAMonitoredItemArguments>,UASeverity) Method
The client object that will perform the operation.
List of OPC-UA monitored item arguments.
The maximum status severity of OPC-UA data to accept.
Subscribes to the specified OPC-UA nodes&attributes, and monitors their data until they have at most the status severity specified for each item, an error occurs, or the alloted time elapses.
Syntax
'Declaration
 
<ExtensionAttribute()>
<ElementsNotNullAttribute()>
<NotNullAttribute()>
Public Overloads Shared Function WaitForMultipleValues( _
   ByVal client As IEasyUAClient, _
   ByVal monitoredItemArgumentsList As IReadOnlyList(Of UAMonitoredItemArguments), _
   ByVal maximumSeverity As UASeverity _
) As ValueResult()
'Usage
 
Dim client As IEasyUAClient
Dim monitoredItemArgumentsList As IReadOnlyList(Of UAMonitoredItemArguments)
Dim maximumSeverity As UASeverity
Dim value() As ValueResult
 
value = IEasyUAClientExtension2.WaitForMultipleValues(client, monitoredItemArgumentsList, maximumSeverity)

Parameters

client
The client object that will perform the operation.
monitoredItemArgumentsList
List of OPC-UA monitored item arguments.
maximumSeverity
The maximum status severity of OPC-UA data to accept.

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, monitoredItemArgumentsList.
Exceptions
ExceptionDescription

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

See Also