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

The callback action to be performed.

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

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.

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

action
The callback action to 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.

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