使用Silverlight 3的Facebook畫布應用程序找不到HttpUtility

Question

我一直在使用Facebook C＃SDK 5.1.1這個令人沮喪的問題。我已成功加載CSSilverlightFacebookApp並確認我的Facebook設置正常。我能夠讓測試應用程序顯示出來。

對於我的主機的情況下，我使用的是谷歌以下App Engine的例子：

def load_signed_request(signed_request): 
"""Load the user state from a signed_request value""" 
global APP_ID, APP_SECRET 
try: 
    sig, payload = signed_request.split(u'.', 1) 
    sig = base64_url_decode(sig) 
    data = json.loads(base64_url_decode(payload)) 

    expected_sig = hmac.new(
     APP_SECRET, msg=payload, digestmod=hashlib.sha256).digest() 

    # allow the signed_request to function for upto 1 day 
    if sig == expected_sig and \ 
      data[u'issued_at'] > (time.time() - 86400): 
     return (data, data.get(u'user_id'), data.get(u'oauth_token')) 
except ValueError, ex: 
    pass # ignore if can't split on dot 

class MainHandler(webapp.RequestHandler): 
def post(self): 
    global APP_ID, APP_SECRET 
    (ignore, ignore, oauth_token) = load_signed_request(self.request.get('signed_request')) 
    if oauth_token: 
     path = os.path.join(os.path.dirname(__file__), 'templates/silverlight.html') 
     params = dict(access_token=oauth_token) 
     self.response.out.write(template.render(path, params)) 

該代碼似乎好工作，我得到傳入我的Silverlight代碼的oauth_token。下面的代碼工作到最後一行：

var token = ""; 
     if (App.Current.Resources.Contains("token") && App.Current.Resources["token"] != null) 
      token = App.Current.Resources["token"].ToString(); 
     if (!string.IsNullOrEmpty(token)) 
     { 
      fb = new FacebookClient(token); 

      fb.GetCompleted += (o, args) => 
      { 
       if (args.Error == null) 
       { 
        var result = (IDictionary<string, object>)args.GetResultData(); 
        //Dispatcher.BeginInvoke(() => InfoBox.ItemsSource = result); 
       } 
       else 
       { 
        // TODO: Need to let the user know there was an error 
        //failedLogin(); 
       } 
      }; 

      // Making Facebook call here! 
      fb.GetAsync("/me"); 
     } 

在fb.GetAsync（ 「/我」），我得到一個TypeLoadException說，它不能找到HttpUtility：

System.TypeLoadException was unhandled by user code 
    Message=Could not load type 'System.Net.HttpUtility' from assembly 'System.Windows, Version=2.0.5.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e'. 
    StackTrace: 
    at FluentHttp.HttpHelper.UrlEncode(String s) 
    at Facebook.FacebookUtils.GetUrl(IDictionary`2 domainMaps, String name, String path, IDictionary`2 parameters) 
    at Facebook.FacebookClient.GetUrl(String name, String path, IDictionary`2 parameters) 
    at Facebook.FacebookClient.BuildRootUrl(HttpMethod httpMethod, String path, IDictionary`2 parameters) 
    at Facebook.FacebookClient.PrepareRequest(String path, IDictionary`2 parameters, HttpMethod httpMethod, Stream& input, IDictionary`2& mediaObjects) 
    at Facebook.FacebookClient.ApiAsync(String path, IDictionary`2 parameters, HttpMethod httpMethod, Object userToken) 
    at Facebook.FacebookClient.GetAsync(String path, IDictionary`2 parameters, Object userToken) 
    at Facebook.FacebookClient.GetAsync(String path, IDictionary`2 parameters) 
    at Facebook.FacebookClient.GetAsync(String path) 
    at TicTacToe10.Page.Page_Loaded(Object sender, RoutedEventArgs e) 
    at MS.Internal.CoreInvokeHandler.InvokeEventHandler(Int32 typeIndex, Delegate handlerDelegate, Object sender, Object args) 
    at MS.Internal.JoltHelper.FireEvent(IntPtr unmanagedObj, IntPtr unmanagedObjArgs, Int32 argsTypeIndex, Int32 actualArgsTypeIndex, String eventName) 
InnerException: 

我有確認我已經包含了System.Windows.dll和System.Net.dll。問題是什麼？它看起來像我的代碼完全像CSFacebookSilverlightApp示例。我也認爲它可能與我使用Silverlight 3而不是4有關，但我已經嘗試了3和4的所有組合，用於sl3和sl4的Facebook.dll。

Answer 1

原來，我的Silverlight項目缺少SILVERLIGHT編譯符號（可能是因爲我最初是在MonoDevelop中創建它的）。這導致Facebook SDK在錯誤的地方查找HttpUtility。下面是來自Facebook SDK的代碼，指出我的解決方案：

public static string UrlEncode(string s) 
    { 
#if WINDOWS_PHONE 
     return System.Net.HttpUtility.UrlEncode(s); 
#elif SILVERLIGHT 
     return System.Windows.Browser.HttpUtility.UrlEncode(s); 
#else 
     return UrlEncode(s, Encoding.UTF8); 
#endif 
    }