QuickOPC User's Guide and Reference
SubscribeNode(Boolean,Object,Predicate<IEnumerable<String>>) Method



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OpcLabs.EasyOpcUA Assembly > OpcLabs.EasyOpc.UA.InformationModel Namespace > UAModelClient Class > SubscribeNode Method : SubscribeNode(Boolean,Object,Predicate<IEnumerable<String>>) Method
true to subscribe; false to unsubscribe.
The node on which the operation will be performed.
The operation will be performed only on members whose tags satisfy this predicate.
Subscribes or unsubscribes model members of the given node whose tags satisfy given specified predicate.
Syntax
'Declaration
 
Public Overloads Sub SubscribeNode( _
   ByVal active As Boolean, _
   ByVal node As Object, _
   ByVal modellingTagsPredicate As Predicate(Of IEnumerable(Of String)) _
) 
 
'Usage
 
Dim instance As UAModelClient
Dim active As Boolean
Dim node As Object
Dim modellingTagsPredicate As Predicate(Of IEnumerable(Of String))
 
instance.SubscribeNode(active, node, modellingTagsPredicate)

Parameters

active
true to subscribe; false to unsubscribe.
node
The node on which the operation will be performed.
modellingTagsPredicate
The operation will be performed only on members whose tags satisfy this predicate.
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.

The component is not licensed for the operation requested.
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