/Code/Source/Teaching.Wpf.Threading/MainWindow.xaml.cs

using System;

using System.Collections.Generic;

using System.IO;

using System.Linq;

using System.Net;

using System.Reactive.Linq;

using System.Text;

using System.Threading.Tasks;

using System.Windows;

using System.Windows.Controls;

using System.Windows.Data;

using System.Windows.Documents;

using System.Windows.Input;

using System.Windows.Media;

using System.Windows.Media.Imaging;

using System.Windows.Navigation;

using System.Windows.Shapes;

using Teaching.Core.Threading;



namespace Teaching.Wpf.Threading

{

    /// <summary>

    /// Interaction logic for MainWindow.xaml

    /// </summary>

    public partial class MainWindow : Window

    {

        public MainWindow()

        {

            InitializeComponent();

        }



        private void DownloadButton_Click(object sender, RoutedEventArgs e)

        {

            if ( string.IsNullOrWhiteSpace(UrlTextBox.Text))

            {

                return;

            }



            var url = UrlTextBox.Text;



            // AMI based ( < NET 4.0 )

            var amiRequest = WebRequest.Create(url);



            amiRequest.BeginGetResponse(state =>

            {

                var response = amiRequest.EndGetResponse(state);

                using( var responseStream = response.GetResponseStream())

                {

                    var content = new StreamReader(responseStream).ReadToEnd();



                    if (!Dispatcher.CheckAccess())

                    {

                        Dispatcher.Invoke(() => ContentTextBox.Text = content);

                    }

                    else

                    {

                        UrlTextBox.Text = content;

                    }

                }

            }, null);

            

            // Threading based ( < NET 4.0 )

            /*var downloadThread = new DisposableThread(c =>

            {

                var content = new WebClient().DownloadString(url);



                if ( !Dispatcher.CheckAccess())

                {

                    Dispatcher.Invoke(() => ContentTextBox.Text = content);

                }

                else

                {

                    UrlTextBox.Text = content;

                }

            });



            downloadThread.Execute();*/



            // TPL based ( NET 4.0 )

            /*new WebClient().DownloadStringTaskAsync(url).ContinueWith(d =>

            {

                this.ContentTextBox.Text = d.Result;

            }, TaskScheduler.FromCurrentSynchronizationContext());*/



#pragma warning disable 4014

            // Async ( NET 4.5 )

            DownloadContent(url);

#pragma warning restore 4014

        }



        private async Task DownloadContent(string url)

        {

            var result = await new WebClient().DownloadStringTaskAsync(url);

            ContentTextBox.Text = result;

        }

    }

}