How to execute function when software ended with normal close (X) or un expected error thrown

Question

I would like to execute a function when the running application terminated via normal close way (right top X) or un expected error happened and software terminated.

How can i do this at c# 4.5 WPF application

Thank you

Answer 1

In your App.xaml.cs -

• Override OnStartUp method and hook UnhandledException event of Current AppDomain, it will get called whenever application was about to close because of some unhandled exception.
• Override OnExit method for normal close of application.

• Create CleanUp method and call the method from above two methods.

  protected override void OnStartup(StartupEventArgs e)
  {
      base.OnStartup(e);
      AppDomain.CurrentDomain.UnhandledException += new
         UnhandledExceptionEventHandler(CurrentDomain_UnhandledException);
  }
  
  private void CleanUp()
  {
      // Your CleanUp code goes here.
  }
  
  protected override void OnExit(ExitEventArgs e)
  {
      CleanUp();
      base.OnExit(e);
  }
  
  void CurrentDomain_UnhandledException(object sender,
                                        UnhandledExceptionEventArgs e)
  {
      CleanUp();
  }