可能的身份验证问题？通过在Silverlight Web客户端加载JSON 4

Question

我玩的Silverlight 4，我当我的页面加载，我称之为

beginGet("my/people/", new OpenReadCompletedEventHandler(continueLoadStamData));

，我已定义为

private void beginGet(string endpoint, OpenReadCompletedEventHandler callback)
{
  WebClient wc = new WebClient();
  wc.Credentials = new NetworkCredential(username, password);
  wc.OpenReadCompleted += callback;
  wc.OpenReadAsync(new Uri(baseURL + endpoint));
}

和continueLoadStamData（）

void continueLoadStamData(object sender, OpenReadCompletedEventArgs e)
{
  JsonObject root = (JsonObject)JsonObject.Load(e.Result);
}

我的问题是，当我到达e.Result，它抛出一个异常。这是相同的例外，我得到当我试图用WebRequest req = ...; req.Credentials = new NetworkCredential(username, password)：

{System.Reflection.TargetInvocationException: An exception occurred during the operation, making the result invalid.  Check InnerException for exception details. ---> System.Net.WebException: An exception occurred during a WebClient request. ---> System.NotImplementedException: This property is not implemented by this class.
   at System.Net.WebRequest.set_Credentials(ICredentials value)
   at System.Net.WebClient.GetWebRequest(Uri address)
   at System.Net.WebClient.OpenReadAsync(Uri address, Object userToken)
   --- End of inner exception stack trace ---
   --- End of inner exception stack trace ---
   at System.ComponentModel.AsyncCompletedEventArgs.RaiseExceptionIfNecessary()
   at System.Net.OpenReadCompletedEventArgs.get_Result()
   at JSONSample.MainPage.continueLoadStamData(Object sender, OpenReadCompletedEventArgs e)
   at System.Net.WebClient.OnOpenReadCompleted(OpenReadCompletedEventArgs e)
   at System.Net.WebClient.OpenReadOperationCompleted(Object arg)}

你有什么事情，我怎么能保证基本的身份验证实施，并得到了我的要求去的任何想法？

干杯

的Nik

Answer 1

根据马克怪物张贴在这里你错过了一些代码在你beginGet方法。应该是这样的：

private void beginGet(string endpoint, OpenReadCompletedEventHandler callback)
{
  WebRequest.RegisterPrefix("http://", System.Net.Browser.WebRequestCreator.ClientHttp);  
  WebClient wc = new WebClient();  
  wc.Credentials = new NetworkCredential(username, password);
  wc.UseDefaultCredentials = false; 
  wc.OpenReadCompleted += callback;  
  wc.OpenReadAsync(new Uri(baseURL + endpoint));
}

此外，如果你只是想从服务器获取JSON，你应该能够使用DownloadStringAsync代替OpenReadAsync这可能会简化事情。