SecurityException和Silverlight Web服務

Question

我一直在關注這個Silverlight tutorial，使用Twitter而不是Digg。一切工作正常，直到我嘗試從服務中獲取數據。

private const string TWITTER_API_URL_FORMAT = "http://api.twitter.com/1/statuses/user_timeline.xml?screen_name={0}"; 
    private void Button_Click(object sender, RoutedEventArgs e) 
    { 
     string username = searchBox.Text; 
     string url = String.Format(TWITTER_API_URL_FORMAT, username); 
     WebClient twitterService = new WebClient(); 
     twitterService.DownloadStringCompleted += new DownloadStringCompletedEventHandler(twitterService_DownloadStringCompleted); 

     label.Text = "Loading... " + url; 
     twitterService.DownloadStringAsync(new Uri(url)); 
    } 

    void twitterService_DownloadStringCompleted(object sender, DownloadStringCompletedEventArgs e) 
    { 
     if (e.Error != null) 
     { 
      label.Text = String.Format("Error: {0}", e.Error); 
      return; 
     } 

     // ... 
    } 

它失敗，出現以下錯誤：

[System.Security.SecurityException] = {System.Security.SecurityException ---> System.Security.SecurityException: Security error. 
    at System.Net.Browser.BrowserHttpWebRequest.InternalEndGetResponse(IAsyncResult asyncResult) 
    at System.Net.Browser.BrowserHttpWebRequest.<>c__DisplayClass5.<E... 

我不知道爲什麼會這樣。該URL是合法的。我有一個wp7 Silverlight項目，使用這個相同的代碼，它工作正常。我可能做錯了什麼？

Answer 1

您可能會遇到跨站點腳本（XSS）錯誤。看看這裏：Making a Service Available Across Domain Boundaries