<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 />
<RowDefinition />
</Grid.RowDefinitions>
<TextBlock x:Name="tbOutput"
Width="200"
Height="20"
Grid.Column="0"
Grid.Row="0" />
<Button x:Name="btnStart"
Width="100"
Height="20"
Grid.Column="0"
Grid.Row="1"
Content="Start"
Click="btnStart_Click" />
</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.Threading;
namespace SilverlightApplication3
{
public partial class MainPage : UserControl
{
public MainPage()
{
InitializeComponent();
}
private void btnStart_Click(object sender, RoutedEventArgs e)
{
ThreadStart ts = new ThreadStart(DoLongRunningTask);
Thread thread = new Thread(ts);
thread.Start();
}
private void DoLongRunningTask()
{
const int SECONDS = 1000;
Thread.Sleep(2 * SECONDS);
Action action = new Action(MarshalToUI);
this.Dispatcher.BeginInvoke(action);
}
private void MarshalToUI()
{
tbOutput.Text = "Task completed";
}
}
}
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