如何讓我的Facebook應用程序訪問發佈到我的Facebook頁面？

Question

我有一個Windows服務，試圖張貼到我的Facebook頁面。下面的代碼返回一個訪問令牌，但是當我去發佈消息時，它會拋出這個異常？我怎麼能告訴我的臉書頁面，這個應用程序可以發佈到它？

（OAuthException - ＃200）（200＃）的用戶沒有授權 應用程序來執行此操作

這裏是主要的呼叫：

string accessToken = FacebookPoster.GetAccessToken("************", "***************"); 
FacebookPoster.PostMessage(accessToken, "My message"); 

這裏我的FacebookPoster類：

public class FacebookPoster 
{ 
    private const string AuthenticationUrlFormat = 
     "https://graph.facebook.com/oauth/access_token?client_id={0}&client_secret={1}&grant_type=client_credentials&scope=manage_pages,offline_access,publish_stream"; 


    public static string GetAccessToken(string apiId, string apiSecret) 
    { 
     string accessToken = string.Empty; 
     string url = string.Format(AuthenticationUrlFormat, apiId, apiSecret); 

     WebRequest request = WebRequest.Create(url); 
     WebResponse response = request.GetResponse(); 

     using (Stream responseStream = response.GetResponseStream()) 
     { 
      StreamReader reader = new StreamReader(responseStream, Encoding.UTF8); 
      String responseString = reader.ReadToEnd(); 

      NameValueCollection query = HttpUtility.ParseQueryString(responseString); 

      accessToken = query["access_token"]; 
     } 

     if (accessToken.Trim().Length == 0) 
      throw new Exception("There is no Access Token"); 

     // this returns an access token 
     return accessToken; 
    } 

    public static void PostMessage(string accessToken, string message) 
    { 
     try 
     { 
      FacebookClient facebookClient = new FacebookClient(accessToken); 

      dynamic messagePost = new ExpandoObject(); 
      messagePost.access_token = accessToken; 

      //messagePost.picture = "[A_PICTURE]"; 
      //messagePost.link = "[SOME_LINK]"; 
      //messagePost.name = "[SOME_NAME]"; 
      //messagePost.caption = "my caption"; 
      messagePost.message = message; 
      //messagePost.description = "my description"; 


      // this call throws the exception: 
      // (OAuthException - #200) (#200) The user hasn't authorized the application to perform this action 
      var result = facebookClient.Post("/643028262411859/feed", messagePost); 
     } 
     catch (FacebookOAuthException ex) 
     { 
      //handle something 
     } 
     catch (Exception ex) 
     { 
      //handle something else 
     } 
    } 
} 

Answer 1

我找到了一種不同的方式來做這

去這裏，然後單擊資源管理器圖形生成一個訪問令牌

https://developers.facebook.com/tools/

那麼這段代碼將創建的帖子：

public static void PostMessage(string accessToken, string message) 
{ 
    try 
    { 
     FacebookClient facebookClient = new FacebookClient(accessToken); 

     dynamic getAccess = new ExpandoObject(); 
     getAccess.access_token = accessToken; 

     dynamic accessResult = facebookClient.Get("/{your facebook userID}/accounts", getAccess); 

     foreach (dynamic j in accessResult.data) 
     { 
      if (j.name == "{Name of your facebook page}") 
      { 
       accessToken = j.access_token; 
      } 
     } 

     dynamic messagePost = new ExpandoObject(); 
     messagePost.access_token = accessToken; 

     //messagePost.picture = ""; 
     //messagePost.link = "[SOME_LINK]"; 
     //messagePost.name = "[SOME_NAME]"; 
     //messagePost.caption = ""; 

     messagePost.message = message; 

     messagePost.url = "{url}";    

     // this will make a photo post 
     var result = facebookClient.Post("/{your page name}/photos", messagePost); 

     // this will make a regular post to your feed 
     facebookClient.Post("/{your page name}/feed", messagePost); 
    } 
    catch (FacebookOAuthException ex) 
    { 
     //handle something 
    } 
    catch (Exception ex) 
    { 
     //handle something else 
    } 
}