Implemented check for updates.

ILSpy/AboutPage.cs

@@ -4,10 +4,14 @@
 using System;
 using System.Diagnostics;
 using System.IO;
+using System.Linq;
+using System.Net;
 using System.Threading.Tasks;
 using System.Windows;
 using System.Windows.Controls;
 using System.Windows.Input;
+using System.Xml;
+using System.Xml.Linq;
 using ICSharpCode.Decompiler;
 using ICSharpCode.ILSpy.TextView;
 
@@ -15,6 +19,8 @@ namespace ICSharpCode.ILSpy
 {
 	static class AboutPage
 	{
+		static readonly Uri UpdateUrl = new Uri("http://www.ilspy.net/updates.xml");
+		
 		static AvailableVersionInfo latestAvailableVersion;
 		
 		public static void Display(DecompilerTextView textView)
@@ -24,34 +30,22 @@ namespace ICSharpCode.ILSpy
 			output.AddUIElement(
 				delegate {
 					StackPanel stackPanel = new StackPanel();
+					stackPanel.HorizontalAlignment = HorizontalAlignment.Center;
 					stackPanel.Orientation = Orientation.Horizontal;
 					if (latestAvailableVersion == null) {
-						Button button = new Button();
-						button.Content = "Check for updates";
-						button.Cursor = Cursors.Arrow;
-						stackPanel.Children.Add(button);
-						
-						button.Click += delegate {
-							button.Content = "Checking...";
-							button.IsEnabled = false;
-							GetLatestVersion().ContinueWith(
-								delegate (Task<AvailableVersionInfo> task) {
-									try {
-										latestAvailableVersion = task.Result;
-										stackPanel.Children.Clear();
-										ShowAvailableVersion(latestAvailableVersion, stackPanel);
-									} catch (Exception ex) {
-										AvalonEditTextOutput exceptionOutput = new AvalonEditTextOutput();
-										exceptionOutput.WriteLine(ex.ToString());
-										textView.Show(exceptionOutput);
-									}
-								}, TaskScheduler.FromCurrentSynchronizationContext());
-						};
+						AddUpdateCheckButton(stackPanel, textView);
 					} else {
 						// we already retrieved the latest version sometime earlier
 						ShowAvailableVersion(latestAvailableVersion, stackPanel);
 					}
-					return stackPanel;
+					CheckBox checkBox = new CheckBox();
+					checkBox.Margin = new Thickness(4);
+					checkBox.Content = "Automatically check for updates every week";
+					return new StackPanel {
+						Margin = new Thickness(0, 4, 0, 0),
+						Cursor = Cursors.Arrow,
+						Children = { stackPanel, checkBox }
+					};
 				});
 			output.WriteLine();
 			output.WriteLine();
@@ -65,13 +59,44 @@ namespace ICSharpCode.ILSpy
 			textView.Show(output);
 		}
 		
+		static void AddUpdateCheckButton(StackPanel stackPanel, DecompilerTextView textView)
+		{
+			Button button = new Button();
+			button.Content = "Check for updates";
+			button.Cursor = Cursors.Arrow;
+			stackPanel.Children.Add(button);
+			
+			button.Click += delegate {
+				button.Content = "Checking...";
+				button.IsEnabled = false;
+				GetLatestVersion().ContinueWith(
+					delegate (Task<AvailableVersionInfo> task) {
+						try {
+							latestAvailableVersion = task.Result;
+							stackPanel.Children.Clear();
+							ShowAvailableVersion(latestAvailableVersion, stackPanel);
+						} catch (Exception ex) {
+							AvalonEditTextOutput exceptionOutput = new AvalonEditTextOutput();
+							exceptionOutput.WriteLine(ex.ToString());
+							textView.Show(exceptionOutput);
+						}
+					}, TaskScheduler.FromCurrentSynchronizationContext());
+			};
+		}
+		
 		static void ShowAvailableVersion(AvailableVersionInfo availableVersion, StackPanel stackPanel)
 		{
 			Version currentVersion = new Version(RevisionClass.Major + "." + RevisionClass.Minor + "." + RevisionClass.Build + "." + RevisionClass.Revision);
 			if (currentVersion == availableVersion.Version) {
-				stackPanel.Children.Add(new Image { Width = 16, Height = 16, Source = Images.OK, Margin = new Thickness(4,0,4,0) });
 				stackPanel.Children.Add(
-					new TextBlock { Text = "You are using the latest release.",
+					new Image {
+						Width = 16, Height = 16,
+						Source = Images.OK,
+						Margin = new Thickness(4,0,4,0)
+					});
+				stackPanel.Children.Add(
+					new TextBlock {
+						Text = "You are using the latest release.",
 						VerticalAlignment = VerticalAlignment.Bottom
 					});
 			} else if (currentVersion < availableVersion.Version) {
@@ -93,15 +118,31 @@ namespace ICSharpCode.ILSpy
 					stackPanel.Children.Add(button);
 				}
 			} else {
-				stackPanel.Children.Add(new TextBlock { Text = "You are using a nightly builds newer than the latest release." });
+				stackPanel.Children.Add(new TextBlock { Text = "You are using a nightly build newer than the latest release." });
 			}
 		}
 		
 		static Task<AvailableVersionInfo> GetLatestVersion()
 		{
-			TaskCompletionSource<AvailableVersionInfo> tcs = new TaskCompletionSource<AvailableVersionInfo>();
-			tcs.SetException(new NotImplementedException());
-			//tcs.SetResult(new AvailableVersionInfo { Version = new Version(0,2,0,37), DownloadUrl = "http://www.ilspy.net/" });
+			var tcs = new TaskCompletionSource<AvailableVersionInfo>();
+			WebClient wc = new WebClient();
+			wc.DownloadDataCompleted += delegate(object sender, DownloadDataCompletedEventArgs e) {
+				if (e.Error != null) {
+					tcs.SetException(e.Error);
+				} else {
+					try {
+						XDocument doc = XDocument.Load(new MemoryStream(e.Result));
+						var bands = doc.Root.Elements("band");
+						var currentBand = bands.FirstOrDefault(b => (string)b.Attribute("id") == "stable") ?? bands.First();
+						Version version = new Version((string)currentBand.Element("latestVersion"));
+						string url = (string)currentBand.Element("downloadUrl");
+						tcs.SetResult(new AvailableVersionInfo { Version = version, DownloadUrl = url });
+					} catch (Exception ex) {
+						tcs.SetException(ex);
+					}
+				}
+			};
+			wc.DownloadDataAsync(UpdateUrl);
 			return tcs.Task;
 		}