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在WPF中复制文件时，如何调用线程，显示进度条。

<Window x:Class="WpfThreadTest.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Closed="Window_Closed" Loaded="Window_Loaded"  Height="209" Width="537" ResizeMode="NoResize">
<Grid Height="186">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="132*" />
<ColumnDefinition Width="236*" />
<ColumnDefinition Width="147*" />
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="Auto" />            
<RowDefinition Height="Auto" />
<RowDefinition Height="Auto" />
<RowDefinition Height="Auto" />
<RowDefinition Height="Auto" />
</Grid.RowDefinitions>
<TextBlock Name="textBlock1" Text="当前时间" Margin="35 10" Height="auto" Width="auto" />
<TextBox Grid.Column="1" Name="displayTimeByThread" Height="auto" Margin="0 10" />
<TextBlock Grid.Row="1" Name="textBlock2" Margin="35 10 0 10 " Text="源文件位置" />
<TextBox Grid.Column="1" Grid.Row="1" Name="srcFile" Margin="0 10" />
<TextBox Grid.Column="1" Grid.Row="2" Name="saveFilePath" Margin="0 10" />
<TextBlock Grid.Row="2" Name="textBlock3" Text="目标文件位置" Margin="35 10 0 10" />
<Button Content="..." Grid.Column="2" Grid.Row="1" Name="button1" Margin="10,10,66,10" Click="button1_Click" />
<Button Content="..." Grid.Column="2" Grid.Row="2" Name="button2" Margin="10,10,66,10" Height="23" Click="button2_Click"/>
<Button Content="开始时间线程" Grid.Column="2" Name="button3"  Margin="10,10,35,10" Height="23" Click="button3_Click" />
<Button Content="开始文件Copy线程" Grid.Column="2" Grid.Row="3" Height="29" HorizontalAlignment="Left" Name="button4" VerticalAlignment="Top" Width="119" Click="button4_Click" />
<TextBlock Grid.Row="3" Name="copyFlag" Text="开始复制" />
<TextBlock Name="displayCopyInfo" Text="文件Copy进行中" Grid.Row="3" Grid.Column="1"  />
<ProgressBar Grid.Column="1" Grid.Row="4" Margin="0 2" Height="8" Name="copyProgress" />
</Grid>
</Window>

 namespace WpfThreadTest
 {
     /// <summary>
     /// MainWindow.xaml 的交互逻辑
     /// </summary>
      public partial class MainWindow : Window
     {
         Thread timeThread;
         Thread copyThread;
         public MainWindow()
         {
             InitializeComponent();
             this.displayTimeByThread.Text = DateTime.Now.ToLocalTime().ToString("yyyy年MM月dd日 hh:mm:ss"); ;
             timeThread = new Thread(new ThreadStart(DispatcherThread));
         }
         private void button3_Click(object sender, RoutedEventArgs e)
         {
             timeThread.Start();       
         }
         public void DispatcherThread()
         {
             //可以通过循环条件来控制UI的更新
              while (true)
             {
                 ///线程优先级，最长超时时间，方法委托（无参方法）
                  displayTimeByThread.Dispatcher.BeginInvoke(
                     DispatcherPriority.Normal, new Action(UpdateTime));
                 Thread.Sleep(1000);               
             }
         }
 
        
         private void UpdateTime()
         {
             this.displayTimeByThread.Text = DateTime.Now.ToLocalTime().ToString("yyyy年MM月dd日 hh:mm:ss");     
         }
 
         private void Window_Closed(object sender, EventArgs e)
         {
             ///关闭所有启动的线程
             timeThread.Abort();
             copyThread.Abort();
             Application.Current.Shutdown();
         }
 
         private void button1_Click(object sender, RoutedEventArgs e)
         {
              ///设定要复制的文件全路径
             OpenFileDialog openFile = new OpenFileDialog();
             openFile.AddExtension = true;
             openFile.CheckPathExists = true;
             openFile.Filter = "*.rar|*.rar|all files|*.*";
             openFile.FilterIndex = 0;
             openFile.Multiselect = false;
             bool? f=openFile.ShowDialog();
             if (f!=null && f.Value)
             {
                 this.srcFile.Text = openFile.FileName;
             }
         }
 
         private void button2_Click(object sender, RoutedEventArgs e)
         {
             ///设定目标文件全路径
             SaveFileDialog saveFile = new SaveFileDialog();
             saveFile.AddExtension = true;
             saveFile.Filter = "*.rar|*.rar|all files|*.*";
             saveFile.FilterIndex = 0;
            
             bool? f= saveFile.ShowDialog();
             if (f != null && f.Value)
             {
                 this.saveFilePath.Text = saveFile.FileName;
             }
         }
 
         private void button4_Click(object sender, RoutedEventArgs e)
         {
             string fileName=this.srcFile.Text.Trim();
             string destPath=this.saveFilePath.Text.Trim();
             if(!File.Exists(fileName))
             {
                 MessageBox.Show("源文件不存在");
                 return;
             }
 
             ///copy file and nodify ui that rate of progress of file copy         
             this.copyFlag.Text = "开始复制。。。";
 
             //设置进度条最大值，这句代码写的有点郁闷
             this.copyProgress.Maximum = (new FileInfo(fileName)).Length;
 
             //保存复制文件信息，以进行传递
             CopyFileInfo c = new CopyFileInfo() { SourcePath = fileName, DestPath = destPath };
             //线程异步调用复制文件
             copyThread = new Thread(new ParameterizedThreadStart(CopyFile));          
             copyThread.Start(c);
 
             this.copyFlag.Text = "复制完成。。。";
             }
         /// <summary>
         /// 复制文件的委托方法
         /// </summary>
         /// <param name="obj">复制文件的信息</param>
         private void CopyFile(object obj)
         {
             CopyFileInfo c = obj as CopyFileInfo;
             CopyFile(c.SourcePath, c.DestPath);
         }
         /// <summary>
         /// 复制文件
         /// </summary>
         /// <param name="sourcePath"></param>
         /// <param name="destPath"></param>
         private void CopyFile( string sourcePath,string destPath)
         {
             FileInfo f = new FileInfo(sourcePath);
             FileStream fsR = f.OpenRead();
             FileStream fsW = File.Create(destPath);
             long fileLength = f.Length;
             byte[] buffer = new byte[1024];
             int n = 0;
            
             while (true)
             {
                 ///设定线程优先级
                 ///异步调用UpdateCopyProgress方法
                 ///并传递2个long类型参数fileLength 与 fsR.Position
                 this.displayCopyInfo.Dispatcher.BeginInvoke(DispatcherPriority.SystemIdle,
                     new Action<long, long>(UpdateCopyProgress), fileLength, fsR.Position);
                
                 //读写文件
                 n=fsR.Read(buffer, 0, 1024);
                 if (n==0)
                 {
                     break;
                 }
                 fsW.Write(buffer, 0, n);
                 fsW.Flush();
                 Thread.Sleep(1);
             }
             fsR.Close();
             fsW.Close();
         }
 
         private void UpdateCopyProgress(long fileLength,long currentLength)
         {
             this.displayCopyInfo.Text = string.Format("总大小：{0},已复制:{1}", fileLength, currentLength);
             //刷新进度条           
             this.copyProgress.Value = currentLength;
         }
 
         private void Window_Loaded(object sender, RoutedEventArgs e)
         {
           
         }
         
     }
     public class CopyFileInfo
     {
         public string SourcePath { get; set; }
         public string DestPath { get; set; }       
     }
 }