Facebook通过oAuth验证获取json数据

  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";
            }
        }