public bool ChangeUserInfo(UserInfo user, out string returnMessage)
        {
            UserInfoDal userInfoDal = new UserInfoDal();

            if (userInfoDal.ChangeUserInfo(user) > 0)
            {
                userList      = new UserInfoDal().GetUserInfoList();
                returnMessage = "修改成功";
                return(true);
            }
            else
            {
                returnMessage = "数据库异常,修改失败,请稍后重试";
                return(false);
            }
        }