Silverlight显示日期和时间

MainPage.xaml文件代码：

<UserControl

 x:Class="SLTimer.MainPage"

 Width="640" Height="480">

 <Grid x:Name="LayoutRoot" Background="White" Loaded="LayoutRoot_Loaded">

  <TextBlock Height="21" HorizontalAlignment="Left" Margin="127,75,0,0" VerticalAlignment="Top" Width="57" Text="当前时间:" TextWrapping="Wrap" FontSize="12" Foreground="#FF315DAB"/>

  <TextBlock x:Name="tbTime" Height="21" Margin="188,75,94,0" VerticalAlignment="Top" TextWrapping="Wrap"/>

 </Grid>

</UserControl>

MainPage.xaml.cs文件代码：

using System;

using System.Windows;

using System.Windows.Controls;

using System.Windows.Documents;

using System.Windows.Ink;

using System.Windows.Input;

using System.Windows.Media;

using System.Windows.Media.Animation;

using System.Windows.Shapes;

using System.Windows.Threading;

namespace SLTimer

{

 public partial class MainPage : UserControl

 {  

  public MainPage()

  {

   // 为初始化变量所必需

   InitializeComponent();

  }

  private void LayoutRoot_Loaded(object sender, System.Windows.RoutedEventArgs e)

   // TODO: Add event handler implementation here.

   DispatcherTimer timer = new DispatcherTimer();

   timer.Interval = new TimeSpan(0,0,1);//时间间隔为1s

   timer.Tick +=new System.EventHandler(timer_Tick);

   timer.Start();

  private void timer_Tick(object sender, System.EventArgs e)

   //首先获取是星期几

   string week = DateTime.Now.DayOfWeek.ToString();

   switch(week)

   {

    case "Monday":

     week = "星期一";

     break;

    case "Tuesday":

     week = "星期二";

    case "Wednesday":

     week = "星期三";

    case "Thurday":

     week = "星期四";

    case "Friday":

     week = "星期五";

    case "Saturday":

     week = "星期六";

    case "Sunday":

     week = "星期日";

   }

   this.tbTime.Text = DateTime.Now.Year + " 年 " + DateTime.Now.Month + " 月 " + DateTime.Now.Day + " 日 "+ week +" "+ DateTime.Now.ToLongTimeString();

 }

}