xmlns='http://schemas.microsoft.com/winfx/2006/xaml/presentation'
xmlns:x='http://schemas.microsoft.com/winfx/2006/xaml'
xmlns:d='http://schemas.microsoft.com/expression/blend/2008'
xmlns:mc='http://schemas.openxmlformats.org/markup-compatibility/2006'
mc:Ignorable='d'
d:DesignWidth='640'
d:DesignHeight='480'>
Grid.Row="0"
Orientation="Vertical">
Width="200"
Height="20" />
Width="200"
Height="20" />
Grid.Row="1"
Orientation="Horizontal">
Width="100"
Height="20"
Content="Start Task"
Click="btnStartTask_Click" />
Width="100"
Height="20"
Content="Cancel Task"
Click="btnCancelTask_Click" />
//File: Page.xaml.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
using System.ComponentModel;
namespace SilverlightApplication3
{
public partial class MainPage : UserControl
{
private BackgroundWorker backgroundWorker = new BackgroundWorker();
public MainPage()
{
InitializeComponent();
backgroundWorker.DoWork += new DoWorkEventHandler(backgroundWorker_DoWork);
backgroundWorker.WorkerReportsProgress = true;
backgroundWorker.WorkerSupportsCancellation = true;
backgroundWorker.ProgressChanged += new ProgressChangedEventHandler(backgroundWorker_ProgressChanged);
backgroundWorker.RunWorkerCompleted +=new RunWorkerCompletedEventHandler(backgroundWorker_RunWorkerCompleted);
}
void backgroundWorker_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
{
if (e.Error != null)
{
txtPercentComplete.Text = e.Error.Message;
}
else if (e.Cancelled)
{
txtPercentComplete.Text = "Task Cancelled";
}
else
{
txtPercentComplete.Text = "Task Completed";
}
}
void backgroundWorker_ProgressChanged(object sender, ProgressChangedEventArgs e)
{
txtPercentComplete.Text = e.ProgressPercentage.ToString() + " %";
}
void backgroundWorker_DoWork(object sender, DoWorkEventArgs e)
{
const int SECOND = 1000;
BackgroundWorker backgroundWorker = (BackgroundWorker)sender;
for (int i = 0; i < 20; i++)
{
if (backgroundWorker.CancellationPending)
{
e.Cancel = true;
return;
}
backgroundWorker.ReportProgress((i + 1) * 5);
System.Threading.Thread.Sleep(SECOND / 4);
}
}
private void btnStartTask_Click(object sender, RoutedEventArgs e)
{
backgroundWorker.RunWorkerAsync();
}
private void btnCancelTask_Click(object sender, RoutedEventArgs e)
{
backgroundWorker.CancelAsync();
}
}
}