<Window.TaskbarItemInfo>
         <TaskbarItemInfo />
     </Window.TaskbarItemInfo>
     
     <Grid>
         <ProgressBar x:Name="ProgressBar"  Margin="10"
                      HorizontalAlignment="Stretch"
                      VerticalAlignment="Center"
                      Height="23" />
     </Grid>

 public partial class MainWindow : Window
     {
         public MainWindow()
         {
             InitializeComponent();
 
             Loaded += new RoutedEventHandler(MainWindow_Loaded);
         }
 
         void MainWindow_Loaded(object sender, RoutedEventArgs e)
         {
             //BackgroundWorker,在单独的线程上执行操作
             BackgroundWorker worker = new BackgroundWorker();
 
             //BW.DoWork,调用BW.RunWorkerAsync()时发生
 
 //初始化命名委托;Lambda 运算符的左边是输入参数（如果有），右边包含表达式或语句块;
             worker.DoWork += (s, ev) =>
                 {
                     for (int i = ; i < ; i += )
                     {
                         Thread.Sleep();
 
                         //BW.ReportProgress,引发BW.ProgressChanged事件
                         ((BackgroundWorker)s).ReportProgress(i);
                     }
                 };
             //调用BW.ReportProgress时发生
             worker.ProgressChanged += new ProgressChangedEventHandler(worker_ProgressChanged);
 
             //当后台操作已完成，被取消或引发异常时发生
             worker.RunWorkerCompleted += new RunWorkerCompletedEventHandler(worker_RunWorkerCompleted);
 
             //BackgroundWorker.WorkerReportsProgress 获取或设置一个值，该值指示 BackgroundWorker 能否报告进度更新。
             worker.WorkerReportsProgress = true;
 
             //TaskbarItemInfo获取或设置 System.Windows.Window 的任务栏缩略图。
 //TaskbarItemInfo.ProgressState 获取或设置一个值，该值指示在任务栏按钮中显示进度指示器的方式。
 
             TaskbarItemInfo.ProgressState = TaskbarItemProgressState.Indeterminate;
 
              //TaskbarItemProgressState枚举值
 //None=0,Indeterminate=1(闪烁绿色),Normal=2(绿色),Error=3(红色),Paused=4(黄色)
 
 //开始执行后台操作
             worker.RunWorkerAsync();
 
         }
 
 
         void worker_ProgressChanged(object sender, ProgressChangedEventArgs e)
         {
             //ProgressChangedEventArgs.ProgressPercentage 获取异步任务的进度百分比
             ProgressBar.Value = e.ProgressPercentage;
 
             // double TaskbarItemInfo.ProgressValue获取或设置一个值，该值指示任务栏按钮中进度指示器的填满状态。
             TaskbarItemInfo.ProgressValue = (double)e.ProgressPercentage / ;
         }
 
         void worker_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
         {
             ProgressBar.Value = ;
             TaskbarItemInfo.ProgressValue = 1.0;
         }
     }