WPF mutex for single app instance not working

Question

I\'m trying to use the mutex method for only allowing one instance of my app to run. That is - I only want a max of one instance for all users on a machine. I\'ve read throu

Answer 1

I was told to implement this mutex approach on an already developed WPF application that we had. The work around to the problem with using override of the OnStart() that I found was in

App.g.cs

This file is located in

obj\x86\debug\

and contains the main() function, so you just simply put this piece of code in your main function.

bool isOnlyInstance = false;
Mutex m = new Mutex(true, @"WpfSingleInstanceApplication", out isOnlyInstance);
if (!isOnlyInstance)
{
    MessageBox.Show("Another Instance of the application is already running.", 
                    "Alert", 
                    MessageBoxButton.OK, 
                    MessageBoxImage.Exclamation);
    return;
}
GC.KeepAlive(m);

but for this you need to keep the BUILD ACTION of your app.xaml set to ApplicationDefinition

NOTE: This might not be the best way, since I'm a beginner. (please tell me if there's something I should change)