XAML代码：
<Window x:Class="backgroundtest.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="160" Width="237"> <StackPanel Height="100" Width="196">
<ProgressBar Name="progressBar" Height="20" Width="200" Margin="10" />
<Button Name="btnProcess" Width="100" Click="btnProcess_click" Margin="5">process</Button>
<Button Name="btncancel" Width="100" Click="btnCancel_Click" Margin="5">cancel</Button> </StackPanel>
</Window>
后台代码
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Text;
using System.Threading;
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; namespace backgroundtest
{
/// <summary>
/// Interaction logic for MainWindow.xaml
/// </summary>
public partial class MainWindow : Window
{
BackgroundWorker bgWorker=new BackgroundWorker();
public MainWindow()
{
InitializeComponent();
bgWorker.WorkerReportsProgress = true;
bgWorker.WorkerSupportsCancellation = true;
bgWorker.DoWork += DoWork_Handle;
bgWorker.ProgressChanged += ProgressChanged_Handle;
bgWorker.RunWorkerCompleted += RunWorkerCompleted_Handler;
} private void btnProcess_click(object sender, RoutedEventArgs e)
{
if (!bgWorker.IsBusy)
{
bgWorker.RunWorkerAsync();
}
} private void ProgressChanged_Handle(Object sender,ProgressChangedEventArgs args)
{
progressBar.Value = args.ProgressPercentage;
} private void DoWork_Handle(object sender, DoWorkEventArgs args)
{
BackgroundWorker worker = sender as BackgroundWorker;
for (int i = 0; i <; i++)
{
if (worker.CancellationPending)
{
args.Cancel = true;
break;
}
else
{
worker.ReportProgress(i*10);
Thread.Sleep(500);
}
} } private void RunWorkerCompleted_Handler(object sender, RunWorkerCompletedEventArgs args)
{
progressBar.Value = 0;
if (args.Cancelled)
{
MessageBox.Show("process was cancelled.", "process cancelled");
}
else
{
MessageBox.Show("process completed normally.", "process completed");
}
} private void btnCancel_Click(object sender, RoutedEventArgs e)
{
bgWorker.CancelAsync();
}
} }