Use Background Worker : BackgroundWorker « Data « Silverlight

1. Silverlight
2. Data
3. BackgroundWorker

Use Background Worker

    

<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">
        
        <Grid.ColumnDefinitions>
            <ColumnDefinition />
        </Grid.ColumnDefinitions>
        <Grid.RowDefinitions>
            <RowDefinition Height="50" />
            <RowDefinition Height="50" />
        </Grid.RowDefinitions>

        <StackPanel Grid.Column="0"
                    Grid.Row="0"
                    Orientation="Vertical">

            <TextBox x:Name="txtEntry"
                 Width="200"
                 Height="20" />

            <TextBox x:Name="txtPercentComplete"
                 Width="200"
                 Height="20" />

        </StackPanel>

        <StackPanel Grid.Column="0"
                    Grid.Row="1"
                    Orientation="Horizontal">

            <Button x:Name="btnStartTask"
                Width="100"
                Height="20"
                Content="Start Task" 
                Click="btnStartTask_Click" />

            <Button x:Name="btnCancelTask"
                    Width="100"
                    Height="20"
                    Content="Cancel Task"
                    Click="btnCancelTask_Click" />

        </StackPanel>

    </Grid>

</UserControl>


//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();
        }
    }
}

   
    
    
    
  

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