/// <summary>
        /// 登录请求(枚举类型转成字符串然后用MethodInfo调用这个方法)
        /// </summary>
        public string Login(string data, Client client, Server server)
        {
            Console.WriteLine("收到登录请求");
            string[] dataStrs = data.Split(',');
            User     user     = userDAO.VerifyUser(client.MySQLConn, dataStrs[0], dataStrs[1]);

            if (user == null)
            {
                //Enum.GetName(typeof(ReturnCode,ReturnCode.Fail));
                return(((int)ReturnCode.Fail).ToString());
            }
            else
            {
                Result result = resultDao.GetResultFromData(client.MySQLConn, user.Id);
                //把信息存储到个人客户端
                client.SetUserData(user, result);
                return(string.Format("{0},{1},{2},{3}", ((int)ReturnCode.Success).ToString(), user.Username, result.TotalCount, result.WinCount));
            }
        }