FaviconBrowser / FaviconBrowser / MainWindow.xaml.cs

using System.Collections.Generic;
using System.IO;
using System.Net;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Media.Imaging;

namespace FaviconBrowser
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
        private static readonly List<string> s_Domains = new List<string>

        public MainWindow()

        private async void GetButton_OnClick(object sender, RoutedEventArgs e)
            if (await GetUserPermission())
                foreach (string domain in s_Domains)

        private async void AddAFavicon(string domain)
            WebClient webClient = new WebClient();
            byte[] bytes = await webClient.DownloadDataTaskAsync("http://" + domain + "/favicon.ico");
            Image imageControl = MakeImageControl(bytes);

        private Task<bool> GetUserPermission()
            // Make a TaskCompletionSource so we can return a puppet Task
            TaskCompletionSource<bool> tcs = new TaskCompletionSource<bool>();

            // Show the dialog
            PermissionDialog dialog = new PermissionDialog();

            // When the user is finished with the dialog, complete the Task using SetResult
            dialog.Closed += delegate { tcs.SetResult(dialog.PermissionGranted); };

            // Return the puppet Task, which isn't completed yet
            return tcs.Task;

        private static Image MakeImageControl(byte[] bytes)
            Image imageControl = new Image();
            BitmapImage bitmapImage = new BitmapImage();
            bitmapImage.StreamSource = new MemoryStream(bytes);
            imageControl.Source = bitmapImage;
            imageControl.Width = 16;
            imageControl.Height = 16;
            return imageControl;
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