如何把照片贴在墙上？

有人成功地将图片发布到当前用户的墙上吗？这是行不通的，如果图片参数是现有的图片 url 则不会显示！我正在使用最新的 FB C# SDK 5.0.8 Beta ...

var args = new Dictionary<string, object>();
args["name"] = "My App";
args["link"] = @"http://apps.facebook.com/test/";
args["caption"] = "My Caption";
args["description"] = "My Description";
args["picture"] = @"http://www.test.com/test.jpeg";
args["message"] = "My Message";
args["actions"] = "";
FbClient.PostAsync(@"/me/feed", args);

以下是我如何将照片发布到 Facebook 用户的墙上。 ImagePath 和 ImageName 是我传递到包含此代码的函数中的字符串参数。

    var fbApp = new FacebookApp();
    var auth = new CanvasAuthorizer(fbApp);

    if (auth.IsAuthorized())
    {

        //Create a new dictionary of objects, with string keys
        Dictionary<string, object> parameters = new Dictionary<string, object>();

        string strDescription = txtDescription.Text;

        //Add elements to the dictionary
        if (string.IsNullOrEmpty(ImagePath) == false)
        {
            //There is an Image to add to the parameters                
            FacebookMediaObject media = new FacebookMediaObject
            {
                FileName = ImageName,
                ContentType = "image/jpeg"
            };

            byte[] img = File.ReadAllBytes(ImagePath);
            media.SetValue(img);

            parameters.Add("source", media);
            parameters.Add("message", strDescription);

            try
            {
                dynamic result = fbApp.Api("/me/photos", parameters, HttpMethod.Post);

            }
            catch (Exception ex)
            {
                //handle error....
                string strErr = ex.Message.ToString();
                lblValidationMsg.Text = strErr;
            }
        }            

    }