Handling the completion of the background task

    
<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="1.5,-0.3">
                    <GradientStop Color="#FF67E206" Offset="0"/>
                    <GradientStop Color="Red" Offset="0.4"/>
                    <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.RunWorkerCompleted += new RunWorkerCompletedEventHandler(backgroundWorker_RunWorkerCompleted);

            backgroundWorker.RunWorkerAsync();                                      
        }

        void backgroundWorker_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
        {
            myProgressBar.Visibility = Visibility.Collapsed;
        }

        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();
        }
    }
}

Related examples in the same category

1.	Updating the UI from a Background Thread
2.	Implementing Threading in Silverlight Applications
3.	Implementing the DoWork event
4.	Reporting progress changes from the BackgroundWorker
5.	Event Dispatcher Timer
6.	No Background Worker
7.	Canceling a BackgroundWorker when a user selects the Escape key
8.	Event Dispatcher with Thread

Handling the completion of the background task : Thread « Data « Silverlight

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