private string SetToken(string gettoken)//此处是你的短token,通过token获取一个两个月的长token        {            string ShortLivedToken = gettoken;            var client = new FacebookClient();            IDictionary<string, object> result;            try            {                result = client.Get("/oauth/access_token", new                {                    grant_type = "fb_exchange_token",                    client_id = "你的id",                    client_secret = "你的secret",                    fb_exchange_token = ShortLivedToken                }) as IDictionary<string, object>;            }            catch (Exception ex)            {                throw new Exception(ex.Message);            }            string token = result["access_token"] as string;            return token;        }

 public string GetDataFromFB(string access_token)        {            if (!string.IsNullOrEmpty(access_token))            {                try                {                    object page = null;                    var client = new FacebookClient(access_token);                    page = client.Get("https://graph.facebook.com/v2.0/内容名/posts?limit=10&access_token=" + access_token);                    return page.ToString();                }                catch (Exception ex)                {                    throw ex;                }            }            else            {                return "token cannot be found";            }        }