OPC Studio 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.

This is typically the OpcLabs.EasyOpc.UA.EasyUAClient object.

The value of this parameter cannot be null (Nothing in Visual Basic).

List of OPC-UA monitored item arguments.

The value of this parameter cannot be null (Nothing in Visual Basic).

The individual elements of the parameter value cannot be null (Nothing in Visual Basic).

The maximum status severity of OPC-UA data to accept.
Waits while the attributes are above the given maximum status severity. Specify arguments objects, and maximum severity.
Syntax
'Declaration
 
<ExtensionAttribute()>
<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.

This is typically the OpcLabs.EasyOpc.UA.EasyUAClient object.

The value of this parameter cannot be null (Nothing in Visual Basic).

monitoredItemArgumentsList
List of OPC-UA monitored item arguments.

The value of this parameter cannot be null (Nothing in Visual Basic).

The individual elements of the parameter value cannot be null (Nothing in Visual Basic).

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.

This method never returns null (Nothing in Visual Basic).

The individual elements of the returned value are never null (Nothing in Visual Basic).

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.

Remarks

This is an extension method (info: C#, VB.NET). In languages that have support for extensions methods (such as C# and VB.NET), you can use the extension method as if it were a regular method on the object that is its first parameter. In other languages (such as with Python.NET), you will call the extension as a static method, and pass it the object on which it acts as its first parameter.

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