OPC Studio User's Guide and Reference
SafeCriticalCallback Method



OpcLabs.BaseLib Assembly > OpcLabs.BaseLib.Widgets Namespace > NotifyingWidget Class : SafeCriticalCallback Method
Name of the callback or event handler.
The callback action to be performed.
Performs a critical callback, guarding against exceptions.
Syntax
'Declaration
 
Protected Shared Sub SafeCriticalCallback( _
   ByVal name As String, _
   ByVal action As Action _
) 
'Usage
 
Dim name As String
Dim action As Action
 
NotifyingWidget.SafeCriticalCallback(name, action)
protected static void SafeCriticalCallback( 
   string name,
   Action action
)
protected:
static void SafeCriticalCallback( 
   String^ name,
   Action^ action
) 

Parameters

name
Name of the callback or event handler.
action
The callback action to be performed.
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