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C# 更新 CheckForUpdates

public void CheckForUpdates()
       {
               Dispatcher.Invoke(() =>
               {
                   try
                   {
                       DLUpdate = new WebClient();
                       JsonDownload = new WebClient();
                       string actualVersion =
                           Convert.ToString(System.Reflection.Assembly.GetExecutingAssembly().GetName().Version);
                       string link = DLUpdate.DownloadString("http://pastebin.com/raw.php?i=bfs0Jdci");
                       string newVersion = DLUpdate.DownloadString(link + "WebExpress/update.txt");
                       DLUpdate.DownloadFileCompleted += DLUpdate_DownloadFileCompleted;
 
                       var version1 = new Version(actualVersion);
                       var version2 = new Version(newVersion);
 
                       var result = version1.CompareTo(version2);
                       if (result > 0)
                           Console.WriteLine("version1 is greater");
                       else if (result < 0)
                       {
                           JsonDownload.DownloadFileAsync(
                               new Uri(link + "WebExpress/files.json"), "files.json");
                           this.Hide();
 
                           DLUpdate.DownloadFileAsync(new Uri(link + "WebExpress/Update.exe"),
                               "Update.exe");
                       }
                       else
                           Console.WriteLine("versions are equal");
                       return;
                   }
                   catch(Exception ex)
                   {
                        
                   }
               });
            
           }

private void DLUpdate_DownloadFileCompleted(object sender, System.ComponentModel.AsyncCompletedEventArgs e)
      {
          try
          {
              if (File.Exists("Update.exe"))
              {
                  Process.Start("Update.exe");
                  Application.Current.Shutdown();
              }
          }
          catch (Exception ex)
          {
              Console.WriteLine("Update open: " + ex.Message);
          }
      }