Mega Code Archive
A Cancellable ProgressBar While Processing on a Background Thread
<![CDATA[
<Window x:Class="WpfApplication1.Window1"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="WPF" Height="100" Width="200">
<StackPanel>
<ProgressBar Name="progressBar"/>
<Button Name="button" Click="button_Click">
Start
</Button>
</StackPanel>
</Window>
//File:Window.xaml.cs
using System.ComponentModel;
using System.Threading;
using System.Windows;
using System.Windows.Input;
namespace WpfApplication1
{
public partial class Window1 : Window
{
private BackgroundWorker worker = new BackgroundWorker();
public Window1()
{
InitializeComponent();
worker.WorkerReportsProgress = true;
worker.WorkerSupportsCancellation = true;
worker.DoWork += new DoWorkEventHandler(worker_DoWork);
worker.RunWorkerCompleted += new RunWorkerCompletedEventHandler(worker_RunWorkerCompleted);
worker.ProgressChanged += worker_ProgressChanged;
}
private void button_Click(object sender, RoutedEventArgs e){
if(!worker.IsBusy)
{
this.Cursor = Cursors.Wait;
worker.RunWorkerAsync();
button.Content = "Cancel";
}else{
worker.CancelAsync();
}
}
private void worker_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
{
this.Cursor = Cursors.Arrow;
if(e.Cancelled)
{
MessageBox.Show("Operation was canceled");
}
else if(e.Error != null)
{
MessageBox.Show(e.Error.Message);
}
button.Content = "Start";
}
private void worker_DoWork(object sender, DoWorkEventArgs e)
{
for(int i = 1; i <= 100; i++)
{
if(worker.CancellationPending)
{
e.Cancel = true;
return;
}
Thread.Sleep(100);
worker.ReportProgress(i);
}
}
private void worker_ProgressChanged(object sender, ProgressChangedEventArgs e)
{
progressBar.Value = e.ProgressPercentage;
}
}
}
]]>