//重载基类的BeforeAction方法，在方法体内，验证token的有效性。
        public override void BeforeAction(string actionName, object[] parameters)
        {
            base.BeforeAction(actionName, parameters);

            if(actionName != "Login")
            {
                //验证用户token
                var tokenClient = new TokenClient("192.168.40.132", 9911);
                var infoArr = tokenClient.VerifyForLongs(this.Header["auth"]);
                if (infoArr == null)
                    throw new Exception("token无效");

                var userid = infoArr[0];
                var expireTime = DateTime.Parse("1970-01-01").AddSeconds(infoArr[1]);
                if(expireTime >= )
                    throw new Exception("token过期");
            }
        }

        /// <summary>
        /// 登陆系统
        /// </summary>
        /// <param name="userName">用户名</param>
        /// <param name="password">密码</param>
        /// <returns>用户token</returns>
        public string Login(string userName,string password)
        {
            //假设用户登陆成功，id为888
            var userid = 888;
            //定义过期时间为15分钟后
            var expire =(long)( (DateTime.Now.AddMinutes(15) - DateTime.Parse("1970-01-01")).TotalSeconds);

            var tokenClient = new TokenClient("192.168.40.132", 9911);
            var token = tokenClient.BuildForLongs(new long[] { userid , expire });
            return token;
        }

        /// <summary>
        /// 刷新token
        /// </summary>
        /// <returns>新的用户token</returns>
        public string RefreshToken()
        {
            //验证用户token
            var tokenClient = new TokenClient("192.168.40.132", 9911);
            var infoArr = tokenClient.VerifyForLongs(this.Header["auth"]);
            if (infoArr == null)
                throw new Exception("token无效");

            var userid = infoArr[0];
            var expireTime = DateTime.Parse("1970-01-01").AddSeconds(infoArr[1]);
            if (DateTime.Now >= expireTime)
                throw new Exception("token过期");

            var expire = (long)((DateTime.Now.AddMinutes(15) - DateTime.Parse("1970-01-01")).TotalSeconds);
            return tokenClient.BuildForLongs(new long[] { userid, expire });
        }

            using ( var tran = CreateMST() )
            {
                tran.SetHeader("auth", token);
                .......