我正在努力与facebook图片上传。 我使用Facebook C#SDK 5.4.1从我的Silverligth 5应用程序(在浏览器中)上传图片。Facebook C#SDK抛出ArgumentNullException
身份验证正在工作,我得到我的访问令牌具有所需的权限。 (我存储我的访问令牌在cookie中,因为我不希望我的Silverlight应用程序重新加载。)
这是我的代码:
void img_LoadingCompleted(object sender, EventArgs e)
{
Dispatcher.BeginInvoke(new Action(() => { string fbcode = ReadCookie("FBCode");
ExtendedImage img = sender as ExtendedImage;
string myAppId = "MY_APPID";
string myAppSecret = "MY_SECRET";
FacebookClient fbclient = new FacebookClient(fbcode);
fbclient.PostCompleted += new EventHandler<FacebookApiEventArgs>(fbclient_PostCompleted);
FacebookMediaObject image = new FacebookMediaObject
{
ContentType = "image/jpg",
FileName = "Testpic"
};
image.SetValue(img.Pixels);
IDictionary<string, object> photoDetails = new Dictionary<string, object>
{
{"message", "Test"},
{"source", image}
};
fbclient.PostAsync("/me/photos", photoDetails);
}));
}
void fbclient_PostCompleted(object sender, FacebookApiEventArgs e)
{
if (e.Cancelled)
{
Dispatcher.BeginInvoke(new Action(() =>
{
MessageBox.Show("Cancelled: "+e.Error);
}));
}
}
唯一的例外是的PostCompleted事件抛出FacebookClient。
{System.ArgumentNullException: Der Wert darf nicht NULL sein.
Parametername: stream
bei System.IO.StreamReader..ctor(Stream stream, Encoding encoding, Boolean detectEncodingFromByteOrderMarks, Int32 bufferSize, Boolean leaveOpen)
bei System.IO.StreamReader..ctor(Stream stream)
bei Facebook.FacebookClient.ProcessResponse(HttpHelper httpHelper, Stream responseStream, Type resultType, String& responseStr, Exception& exception, Boolean& cancelled)}
感谢您的帮助。
考虑将此标记为答案!感谢您的跟踪。 – 2012-02-24 03:51:03