Right way to close WPF GUI application: GetCurrentProcess().Kill(), Environment.Exit(0) or this.Shutdown()

user_462347 0
Viewed 65718

My GUI desktop-based WPF 4.0 (C# .Net 4.0) program works with SQL Server database. Each time when I run my application it creates a connection to SQL Server via ADO.NET Entity Framework and if SQL Server is not reachable it throws an exception and shows MessageBox with notification.

Now I want that after user read this message application will shut down. I found three ways to do this:

Process.GetCurrentProcess().Kill();

or

this.Shutdown(); // Application.Current.Shutdown()

or

System.Environment.Exit(0);

All of them work fine and do what I need — close application and kill application's process in Windows Task Manager.

I want to know:

  1. What is the difference between them?
  2. Which way will close my application faster?
  3. Which way to close application should I use?
  4. Is Application.Current.Shutdown() and this.Shutdown() the same way to close application?

Or maybe there is another, more suitable, way to close a WPF GUI application?

Application.Exit() doesn't work for me as I get the error:

The event 'System.Windows.Application.Exit' can only appear on the left-hand side of += or -=

Thanks.

close-application exception-handling wpf database c#
4 Answers

@Damian Leszczyński - Vash's answer pretty much covers the 4 specific questions you asked. For your final question on Application.Exit(), that's an event you can subscribe to, not a method that you can call. It should be used like this:

Application.Current.Exit += CurrentOnExit; 
//this.Exit += CurrentOnExit; would also work if you're in your main application class

...

private void CurrentOnExit(object sender, ExitEventArgs exitEventArgs)
{
    //do some final stuff here before the app shuts down
}
user_7643710
Related