Question

Also, if I reuse this.dispatcher with another BeginInvoke, do I need “Dispatcher.Run” again?

 var thread = new Thread(() =>
            {
                this.dispatcher = Dispatcher.CurrentDispatcher;
                this.dispatcher .BeginInvoke(new Action(() =>
                {
                    try
                    {
                       do something
                    }
                    catch (Exception ex)
                    {
                        onNotify(ex);
                    }
                }));
                Dispatcher.Run();
            });
            thread.Name = string.Format("{0} Hook Thread", this.GetType().Name);
            thread.IsBackground = true;
            thread.SetApartmentState(ApartmentState.STA);
            thread.Start();

Answer 1

Dispatcher.BeginInvoke adds a delegate on to the dispatcher’s event queue.

The queue is only processed inside Run().

Run() is a blocking call that will execute forever (or until you call InvokeShutdown()).

If you call BeginInvoke() again, Run() will see the new delegate right away and execute it immediately. (Or as soon as it’s free)