This library allows you to create single instance applications.

Use Asjc.* instead of AS.* and AsUtils.*!

Getting started

Call the SingletonApp.Check method at an appropriate place. It will return a bool indicating whether the application is a new instance.

// WPF
protected override void OnStartup(StartupEventArgs e)
{
    base.OnStartup(e);

    if (!SingletonApp.Check())
        Shutdown();
}

Don't forget to call the SingletonApp.Cleanup method when the application is closed!

Attention

Do not call the SingletonApp.Check method repeatedly. Use SingletonApp.IsNew instead, unless you are fully aware of what you are doing.

bool result1 = SingletonApp.Check(); // True
bool result2 = SingletonApp.IsNew; // True
bool result3 = SingletonApp.Check(); // False
bool result4 = SingletonApp.IsNew; // False