/// <summary>
        /// 設定學校放假日的組態值
        /// </summary>
        /// <param name="schoolHolidayRecord"></param>
        public static void SetSchoolHolidayRecord(SchoolHolidayRecord schoolHolidayRecord)
        {
            if (schoolHolidayRecord == null)
                return;

            ConfigData cd = School.Configuration[SchoolHodidayConfigString];
            cd[configString] = schoolHolidayRecord.GetXmlString();

            cd.Save();
        }
        public static SchoolHolidayRecord SelectSchoolHolidayRecord()
        {
            SchoolHolidayRecord result = null;
            ConfigData cd = School.Configuration[SchoolHoliday.SchoolHodidayConfigString];

            string xmlContent = cd[configString];

            if (xmlContent != "")
                result = new SchoolHolidayRecord(xmlContent);

            return result;
        }