DispatcherTimer和Timer的区别

两者区别是 Timer在非UI线程跑的，DispatcherTimer是在UI线程跑的，

DispatcherTimer 可以直接更新UI

Timer必须使用this.Dispatcher.BeginInvoke去更新UI

        private void DisPatcherTimerMethod()
        {
            DispatcherTimer timer = new DispatcherTimer();
            timer.Interval = TimeSpan.FromMilliseconds(1000);
            timer.Tick += Timer_Tick;
            timer.Start();
        }
        private void Timer_Tick(object sender, EventArgs e)
        {
            this.label1.Text = DateTime.Now.ToString();
        }
        private void TimerMethod()
        {
            System.Timers.Timer tmr = new System.Timers.Timer(1000); //1秒一个循环
            tmr.Elapsed += tmr_Elapsed;
            tmr.Start();
        }
        private void tmr_Elapsed(object sender, System.Timers.ElapsedEventArgs e)
        {
            this.Dispatcher.BeginInvoke(new Action(() =>
            {
                this.label2.Text = DateTime.Now.ToString();
            }), null);
        }