QuickOPC User's Guide and Reference
CallbackError Method (NotifyingWidget)



OpcLabs.BaseLib Assembly > OpcLabs.BaseLib.Widgets Namespace > NotifyingWidget Class : CallbackError Method
Name of the callback or event handler.
The exception thrown by the handler.
Processes an error that has occurred during a callback.
Syntax
'Declaration
 
Protected Overridable Sub CallbackError( _
   ByVal name As String, _
   ByVal exception As Exception _
) 
'Usage
 
Dim instance As NotifyingWidget
Dim name As String
Dim exception As Exception
 
instance.CallbackError(name, exception)
protected virtual void CallbackError( 
   string name,
   Exception exception
)
protected:
virtual void CallbackError( 
   String^ name,
   Exception^ exception
) 

Parameters

name
Name of the callback or event handler.
exception
The exception thrown by the handler.
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