Silverlight中的Timer

public partial class Timer : UserControl
    {
        public Timer()
        {
            // 为初始化变量所必需
            InitializeComponent();
            DispatcherTimer timer = new DispatcherTimer();
            timer.Interval = new TimeSpan(0, 0, 1);
            timer.Tick += new EventHandler(timer_Tick);
            timer.Start();
        }

        void timer_Tick(object sender, EventArgs e)
        {
            tbkTimer.Text = "当前时间:" + DateTime.Now.ToLongTimeString();
        }
    }