WPF ProgressBar实现实时进度效果

<Page x:Class="WpfBrowserAppDrill.ProgressBarPage"  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"  xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"   xmlns:d="http://schemas.microsoft.com/expression/blend/2008"   mc:Ignorable="d" <Grid>  <Button Margin="10" Click="Button_Click" VerticalAlignment="Top" Height="23" Width="100">进度条控制</Button>  <TextBlock Name="txtJD" VerticalAlignment="Top" HorizontalAlignment="Center" Margin="50">当前进度：</TextBlock>  <ProgressBar Height="20" HorizontalAlignment="Center" Margin="8,167,0,0" Name="pb_import" VerticalAlignment="Top" Width="500" /> </Grid></Page>

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Windows;using System.Windows.Controls;using System.Windows.Data;using System.Windows.Documents;using System.Windows.Input;using System.Windows.Media;using System.Windows.Media.Imaging;using System.Windows.Navigation;using System.Windows.Shapes;using System.Threading;namespace WpfBrowserAppDrill{ /// <summary> /// ProgressBarPage.xaml 的交互逻辑 /// </summary> public partial class ProgressBarPage : Page {  public ProgressBarPage()  {   InitializeComponent();   }   private void beginImport()   {   double value = 0;   double total = 100d;//得到循环次数   while (value < total)   {    double jd = Math.Round(((value + 1) * (pb_import.Maximum / total)), 4);    pb_import.Dispatcher.Invoke(new Action<System.Windows.DependencyProperty, object>(pb_import.SetValue),     System.Windows.Threading.DispatcherPriority.Background,     ProgressBar.ValueProperty,     jd);    //这里是加数据或费时的操作，我这里让它挂起300毫秒    Thread.Sleep(300);    txtJD.Text = "当前的进度是:" + (value + 1) + "(实际值)" + jd + "(百分比)";    value++;   }  }  private void Button_Click(object sender, RoutedEventArgs e)  {   beginImport();   ////new Thread(new ThreadStart(beginImport)).Start();  }  private void Page_Loaded(object sender, RoutedEventArgs e)  {     pb_import.Maximum = 100;   pb_import.Value = 0;   }  }}