public ActionResult GetAccessToken(string appId, string appSecret)

        {

            var key = "appidAccesstoken";

            //首先查询是否已经存在session中  存储到session中是因为token的获取每天是有次数限制的，而且每次重新获取之后，都会导致之前获取的信息失效

            var token = CacheHelper.GetCache(key);

            var accesstoken = "";

            if (token == null)

            {

                var gettokenUrl = string.Format("https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid={0}&secret={1}", appId, appSecret);

                var httpClient = new HttpClient();

                var result = httpClient.GetStringAsync(gettokenUrl).Result;

                if (string.IsNullOrEmpty(result))

                {

                    return 查询失败;

                }

                token = JsonConvert.DeserializeObject(result);

                var timespan = new TimeSpan(0, token.expires_in - 10, 0);

                CacheHelper.SetCache(key, token, timespan);

            }

            accesstoken = token.access_token;

            return 查询成功;

        }