OPC Studio User's Guide and Reference
SendCallbackError Method (NotifyingWidget)



OpcLabs.BaseLib Assembly > OpcLabs.BaseLib.Widgets Namespace > NotifyingWidget Class : SendCallbackError Method
Name of the callback or event handler.

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

The exception thrown by the handler.

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

Processes an error that has occurred during sending of a callback.
Syntax
'Declaration
 
Protected Overridable Sub SendCallbackError( _
   ByVal name As String, _
   ByVal exception As Exception _
) 
'Usage
 
Dim instance As NotifyingWidget
Dim name As String
Dim exception As Exception
 
instance.SendCallbackError(name, exception)
protected virtual void SendCallbackError( 
   string name,
   Exception exception
)
protected:
virtual void SendCallbackError( 
   String^ name,
   Exception^ exception
) 

Parameters

name
Name of the callback or event handler.

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

exception
The exception thrown by the handler.

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.

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