公历转为农历的函数

　　　/// <summary>
        /// 公历转为农历的函数
        /// </summary>
        /// <param name="solarDateTime">公历日期</param>
        /// <returns>农历的日期</returns>
        static string SolarToChineseLunisolarDate(DateTime solarDateTime)
        {
            System.Globalization.ChineseLunisolarCalendar cal = new System.Globalization.ChineseLunisolarCalendar();

            int year = cal.GetYear(solarDateTime);
            int month = cal.GetMonth(solarDateTime);
            int day = cal.GetDayOfMonth(solarDateTime);
            int leapMonth = cal.GetLeapMonth(year);
            return string.Format("农历{0}{1}（{2}）年{3}{4}月{5}{6}"
                                , "甲乙丙丁戊己庚辛壬癸"[(year - 4) % 10]
                                , "子丑寅卯辰巳午未申酉戌亥"[(year - 4) % 12]
                                , "鼠牛虎兔龙蛇马羊猴鸡狗猪"[(year - 4) % 12]
                                , month == leapMonth ? "闰" : ""
                                , "无正二三四五六七八九十冬腊"[leapMonth > 0 && leapMonth <= month ? month - 1 : month]
                                , "初十廿三"[day / 10]
                                , "日一二三四五六七八九"[day % 10]
                                );
        }