public string GetInfo()
        {
            List <HospitalInfo> list = new List <HospitalInfo>();
            string sqlhos            = "select * from HospitalInfo";

            using (SqlDataReader sdr = SqlHelper.ExecuteReader(sqlhos))
            {
                if (sdr.HasRows)
                {
                    while (sdr.Read())
                    {
                        HospitalInfo hpf = new HospitalInfo();
                        hpf.Id = Convert.ToInt32(sdr["ID"]);
                        //hpf.HospitalId = Convert.ToInt32(sdr["Hospital_ID"]);
                        //hpf.HospitalName = sdr["HospitalName"].ToString();
                        //hpf.DoctorId = Convert.ToInt32(sdr["Doctor_ID"]);
                        hpf.DoctorName = sdr["DoctorName"].ToString();
                        list.Add(hpf);
                    }
                }
            }
            //把集合放入json中
            //JavaScriptSerializer js = new JavaScriptSerializer();
            //return js.Serialize(list);
            string jsonData = JsonConvert.SerializeObject(list);

            return(jsonData);
        }
        /// <summary>
        /// 得到用户登录名,判断用户是否登陆成功
        /// </summary>
        /// <param name="User_Id"></param>
        /// <param name="Password"></param>
        /// <returns>登陆成功或者失败</returns>
        public string GetUserInfoByLoginName(string User_Id, string Password)
        {
            string    sqlsys = "select * from sys_users where User_Id=@User_Id and Password=@Password";
            string    res    = "";
            DataTable dt     = SqlHelper.ExecuteTable(sqlsys, new SqlParameter("@User_Id", User_Id), new SqlParameter("@Password", Password));

            if (dt.Rows.Count > 0)
            {
                HospitalInfo hpf = new HospitalInfo();
                res = hpf.GetInfo();
            }

            //sys_users temp = new sys_users();
            //temp.User_ID = 1;
            //temp.UserName = "******";
            //temp.Password = "******";
            //temp.UserRole = "doctor";
            //temp.HospitalName = "郑州大学第一附属医院";

            //把集合放入json中
            //JavaScriptSerializer js = new JavaScriptSerializer();
            //string jsonData = JsonConvert.SerializeObject(lstStuModel);
            //return js.Serialize(res);

            return(res);
        }