A Cancellable ProgressBar While Processing on a Background Thread

  
<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;
        }
    }
}

Related examples in the same category

1.	Execute a Method Asynchronously Using a Background Worker Thread
2.	Track the Progress of a Background Worker Thread
3.	Support the Cancellation of a Background Worker Thread
4.	Create a Background Worker Thread in XAML
5.	Show a ProgressBar While Processing on a Background Thread
6.	Use BackgroundWorker to run task at background
7.	Show a Continuous Progress Bar While Processing on a Background Thread
8.	Using a BackgroundWorker: progress changed and completed
9.	Unblock Thread with BackgroundWorker

A Cancellable ProgressBar While Processing on a Background Thread : BackgroundWorker « Windows Presentation Foundation « C# / C Sharp

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