WebClient DownloadStringCompleted從未在控制檯應用程序中被解僱

我不確定爲什麼回調方法沒有被全部觸發。我使用VS 2010WebClient DownloadStringCompleted從未在控制檯應用程序中被解僱

static void Main(string[] args) 
     { 
      try 
      { 
       var url = "some link to RSS FEED"; 
       var client = new WebClient(); 
       client.DownloadStringCompleted += new DownloadStringCompletedEventHandler(client_DownloadStringCompleted); 
       client.DownloadDataCompleted += new DownloadDataCompletedEventHandler(client_DownloadDataCompleted); 

       client.DownloadStringAsync(new Uri(url)); 
      } 
      catch (Exception ex) 
      { 
       Console.WriteLine(ex.Message); 
      } 
     } 
     // THIS IS NEVER FIRED 
     static void client_DownloadDataCompleted(object sender, DownloadDataCompletedEventArgs e) 
     { 
      Console.WriteLine("something"); 
     } 

     // THIS IS NEVER FIRED 
     static void client_DownloadStringCompleted(object sender, DownloadStringCompletedEventArgs e) 
     { 
      Console.WriteLine("do something"); 

      var rss = XElement.Parse(e.Result); 

      var pictures = from item in rss.Descendants("channel") 
          select new Picture 
          { 
           Name = item.Element("title").Value 
          }; 

      foreach (var picture in pictures) 
      { 
       Console.WriteLine(picture.Name); 
       Console.WriteLine(picture.Url); 
      } 

     }

來源

2010-05-08 azamsharp

你有沒有得到答案？ – 2011-04-21 13:42:33

如果調用DownloadDataAsync()法DownloadDataCompleted事件。如果您撥打DownloadStringAsync()方法，則會觸發DownloadStringCompleted。

爲了讓DownloadDataCompleted事件，火災，請嘗試：

static void Main(string[] args) 
     { 
      try 
      { 
       var url = "http://blog.gravitypad.com"; 
       //client.DownloadStringCompleted += new DownloadStringCompletedEventHandler(client_DownloadStringCompleted); 
       client.DownloadDataCompleted += new DownloadDataCompletedEventHandler(client_DownloadDataCompleted); 

       client.DownloadDataAsync(new Uri(url)); 
       Console.ReadLine(); 
      } 
      catch (Exception ex) 
      { 
       Console.WriteLine(ex.Message); 
      } 
     }

來源

2010-05-08 03:18:25

應該提到：DownloadDataAsync將返回結果作爲字節數組，其中DownloadStringAsync將以字符串形式返回結果。 – 2010-05-08 03:33:21

我在上面的代碼中調用DownloadStringAsync方法！ – azamsharp 2010-05-08 03:37:45

沒錯，但是您期待着DownloadDataCompleted事件觸發。只有DownloadStringCompleted甚至會觸發...除非你調用DownloadDataAsync。 – 2010-05-08 04:02:24

我有這個問題，並意識到URI是不正確的。我的意思是事件不會觸發，除非文件被正確讀取。所以我把我的xml文件放在ClientBin中，它的功能很神奇！

來源

2012-04-14 13:27:13 user681593

WebClient DownloadStringCompleted從未在控制檯應用程序中被解僱

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