面试题之redis实现限制1小时内每用户Id最多只能登录5次

面试题之redis实现限制1小时内每用户Id最多只能登录5次

        /// <summary>
        /// redis实现限制1小时内每用户Id最多只能登录5次
        /// </summary>
        /// <param name="userid">用户id</param>
        public static void CheckLogin(string userid)
        {
            var listCount = redisClient.GetListCount(userid);
            if (listCount < 5)
            {
                redisClient.AddItemToList(userid, DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss"));
            }
            else
            {
                var now = DateTime.Now;
                var first = Convert.ToDateTime(redisClient.GetItemFromList(userid, 0));
                var tem = (now - first).TotalHours;
                if (tem < 1)
                {
                    throw new Exception("登录过于频繁，请稍后重试！");
                }
                else
                {
                    redisClient.RemoveStartFromList(userid);
                    redisClient.AddItemToList(userid, now.ToString("yyyy-MM-dd HH:mm:ss"));
                }
            }
            //调用登录即可
        }