OPC Studio User's Guide and Reference
SubscribeNode(Boolean,Object) Method



OpcLabs.EasyOpcUA Assembly > OpcLabs.EasyOpc.UA.InformationModel Namespace > UAModelClient Class > SubscribeNode Method : SubscribeNode(Boolean,Object) Method
true to subscribe; false to unsubscribe.
The node on which the operation will be performed.

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

Subscribes or unsubscribes all designated model members of the given node.
Syntax
'Declaration
 
Public Overloads Sub SubscribeNode( _
   ByVal active As Boolean, _
   ByVal node As Object _
) 
'Usage
 
Dim instance As UAModelClient
Dim active As Boolean
Dim node As Object
 
instance.SubscribeNode(active, node)
public void SubscribeNode( 
   bool active,
   object node
)
public:
void SubscribeNode( 
   bool active,
   Object^ node
) 

Parameters

active
true to subscribe; false to unsubscribe.
node
The node on which the operation will be performed.

The value of this parameter cannot be 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.

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