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

As extension sample:

public static class Extension
{
    private static Mutex mutex;

    public static bool IsOneTimeLaunch(this Application application, string uniqueName = null)
    {
        var applicationName = Path.GetFileName(Assembly.GetEntryAssembly().GetName().Name);
        uniqueName = uniqueName ?? string.Format("{0}_{1}_{2}",
            Environment.MachineName,
            Environment.UserName,
            applicationName);

        application.Exit += (sender, e) => mutex.Dispose();
        bool isOneTimeLaunch;
        mutex = new Mutex(true, uniqueName, out isOneTimeLaunch);
        return isOneTimeLaunch;
    }
}

App Class:

    protected override void OnStartup(StartupEventArgs e)
    {
        if (this.IsOneTimeLaunch())
        {
            base.OnStartup(e);
        }
        else
        {
            this.Shutdown();
        }
    }