Canceling a BackgroundWorker when a user selects the Escape key
<UserControl x:Class='SilverlightApplication3.MainPage'
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 x:Name="LayoutRoot" Background="White" KeyUp="LayoutRoot_KeyUp">
<ProgressBar x:Name="myProgressBar" Height="30" Width="250" Background="White" BorderBrush="Black" BorderThickness="2">
<ProgressBar.Foreground>
<LinearGradientBrush EndPoint="0.5,1.35" StartPoint="0.5,-0.3">
<GradientStop Color="#FF67E206" Offset="0"/>
<GradientStop Color="#FF209900" Offset="0.418"/>
<GradientStop Color="#FF67E206" Offset="1"/>
</LinearGradientBrush>
</ProgressBar.Foreground>
</ProgressBar>
</Grid>
</UserControl>
//File: Page.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;
using System.Threading;
namespace SilverlightApplication3
{
public partial class MainPage : UserControl
{
private BackgroundWorker backgroundWorker = null;
public MainPage()
{
InitializeComponent();
backgroundWorker = new BackgroundWorker();
backgroundWorker.WorkerReportsProgress = true;
backgroundWorker.WorkerSupportsCancellation = true;
backgroundWorker.DoWork += new DoWorkEventHandler(backgroundWorker_DoWork);
backgroundWorker.ProgressChanged += new ProgressChangedEventHandler(backgroundWorker_ProgressChanged);
backgroundWorker.RunWorkerAsync();
}
void backgroundWorker_ProgressChanged(object sender, ProgressChangedEventArgs e)
{
myProgressBar.Value = e.ProgressPercentage;
}
void backgroundWorker_DoWork(object sender, DoWorkEventArgs e)
{
for (int i = 1; i <= 100; i++)
{
if (backgroundWorker.CancellationPending == true)
return;
backgroundWorker.ReportProgress(i);
Thread.Sleep(25);
}
}
private void LayoutRoot_KeyUp(object sender, KeyEventArgs e)
{
if ((e.Key == Key.Escape) && (backgroundWorker.IsBusy == true))
backgroundWorker.CancelAsync();
}
}
}
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