使用dispatcher.BeginInvoke时，何时/为什么需要调用Dispatcher.Run？

 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();