wpf 定时器应用，在界面动态刷新时间

 DispatcherTimer = new DispatcherTimer();
 Timer.Tick += Timer_Tick;
 Timer.Interval = TimeSpan.FromSeconds();
 Timer.Start();

 private void Timer_Tick(object sender, EventArgs e)
         {
             //todo
             //获取温度的数值

             //获取年月日
             string dt_ymd = DateTime.Now.ToLongDateString();
             this.LbYearAndMonth.Content = dt_ymd;
             //获取几时几分
             string dt_hm = DateTime.Now.ToShortTimeString();
             this.LbHourAndMin.Content = dt_hm;

             //获取今天是星期几
             string[] Day = new string[] { "星期日", "星期一", "星期二", "星期三", "星期四", "星期五", "星期六" };
             string week = Day[Convert.ToInt32(DateTime.Now.DayOfWeek.ToString("d"))].ToString();
             this.LbWeekday.Content = week;
         }