Silverlight 4 WebRequest、SSL和凭据

    public void StartDataRequest()
    {
        WebRequest.RegisterPrefix("https://", System.Net.Browser.WebRequestCreator.ClientHttp);

        WebClient myService = new WebClient
                              {
                                  AllowReadStreamBuffering = true,
                                  UseDefaultCredentials = false,
                                  Credentials = new NetworkCredential("username", "password")
                              };
        myService.UseDefaultCredentials = false;

        myService.OpenReadCompleted += this.RequestCompleted;
        myService.OpenReadAsync(new Uri("Url"));
    }

    public void RequestCompleted(object sender, System.Net.OpenReadCompletedEventArgs e)
    {
        // ...
    }

现在这对Twitter来说非常有效。但是当我尝试使用另一个https服务时,我得到了一个安全错误。

谢谢。