using System;  using System.Collections.Generic;  using System.Text;    namespace ConsoleApp  {      /**    * ChineseCalendarGB.java    * Copyright (c) 1997-2002 by Dr. Herong Yang    * 中国农历算法- 实用于公历1901 年至2100 年之间的200 年    */      public class CnCalendar      {          static fileds            static methods            private int gregorianYear = 1901;          private int gregorianMonth = 1;          private int gregorianDate = 1;          private bool isGregorianLeap;          private int dayOfYear;            /// <summary>          /// 周日------- 一星期的第一天          /// </summary>          private int dayOfWeek;          private int chineseYear;            /// <summary>          /// 负数表示闰月          /// </summary>          private int chineseMonth;            private int chineseDate;            //24节气          private int sectionalTerm;          private int principleTerm;            public CnCalendar()          {              SetGregorian(1901, 1, 1);          }            public void SetGregorian(int y, int m, int d)          {              gregorianYear = y;              gregorianMonth = m;              gregorianDate = d;              isGregorianLeap = IsGregorianLeapYear(y);              dayOfYear = DayOfYear(y, m, d);              dayOfWeek = DayOfWeek(y, m, d);              chineseYear = 0;              chineseMonth = 0;              chineseDate = 0;              sectionalTerm = 0;              principleTerm = 0;          }            /// <summary>          /// 根据设定的公历（阳历）年月人计算农历年月日天干地支          /// </summary>          /// <returns>是否得到结果，得到结果为0，否则为1</returns>          public int ComputeChineseFields()          {              if (gregorianYear < 1901 || gregorianYear > 2100) return 1;              int startYear = baseYear;              int startMonth = baseMonth;              int startDate = baseDate;              chineseYear = baseChineseYear;              chineseMonth = baseChineseMonth;              chineseDate = baseChineseDate;              // 第二个对应日，用以提高计算效率              // 公历2000 年1 月1 日，对应农历4697 年11 月25 日              if (gregorianYear >= 2000)              {                  startYear = baseYear + 99;                  startMonth = 1;                  startDate = 1;                  chineseYear = baseChineseYear + 99;                  chineseMonth = 11;                  chineseDate = 25;              }              int daysDiff = 0;              for (int i = startYear; i < gregorianYear; i++)              {                  daysDiff += 365;                  if (IsGregorianLeapYear(i)) daysDiff += 1; // leap year              }              for (int i = startMonth; i < gregorianMonth; i++)              {                  daysDiff += DaysInGregorianMonth(gregorianYear, i);              }              daysDiff += gregorianDate - startDate;                chineseDate += daysDiff;              int lastDate = DaysInChineseMonth(chineseYear, chineseMonth);              int nextMonth = NextChineseMonth(chineseYear, chineseMonth);              while (chineseDate > lastDate)              {                  if (Math.Abs(nextMonth) < Math.Abs(chineseMonth)) chineseYear++;                  chineseMonth = nextMonth;                  chineseDate -= lastDate;                  lastDate = DaysInChineseMonth(chineseYear, chineseMonth);                  nextMonth = NextChineseMonth(chineseYear, chineseMonth);              }              return 0;          }            /// <summary>          /// 计算24节气          /// </summary>          /// <returns></returns>          public int ComputeSolarTerms()          {              if (gregorianYear < 1901 || gregorianYear > 2100) return 1;              sectionalTerm = SectionalTerm(gregorianYear, gregorianMonth);              principleTerm = PrincipleTerm(gregorianYear, gregorianMonth);              return 0;          }            public override string ToString()          {              StringBuilder buf = new StringBuilder();              buf.Append("Gregorian Year: " + gregorianYear + "\n");              buf.Append("Gregorian Month: " + gregorianMonth + "\n");              buf.Append("Gregorian Date: " + gregorianDate + "\n");              buf.Append("Is Leap Year: " + isGregorianLeap + "\n");              buf.Append("Day of Year: " + dayOfYear + "\n");              buf.Append("Day of Week: " + dayOfWeek + "\n");              buf.Append("Chinese Year: " + chineseYear + "\n");              buf.Append("Heavenly Stem: " + TIANGAN_NAMES[((chineseYear - 1) % 10)] + "\n");              buf.Append("Earthly Branch: " + DIZHI_NAMES[((chineseYear - 1) % 12)] + "\n");              buf.Append("Chinese Month: " + chineseMonth + "\n");              buf.Append("Chinese Date: " + chineseDate + "\n");              buf.Append("Sectional Term: " + sectionalTerm + "\n");              buf.Append("Principle Term: " + principleTerm + "\n");              return buf.ToString();          }            /// <summary>          /// 计算指定日期的明天的农历          /// </summary>          public void RollUpOneDay()          {              dayOfWeek = dayOfWeek % 7 + 1;              dayOfYear++;              gregorianDate++;              int days = DaysInGregorianMonth(gregorianYear, gregorianMonth);              if (gregorianDate > days)              {                  gregorianDate = 1;                  gregorianMonth++;                  if (gregorianMonth > 12)                  {                      gregorianMonth = 1;                      gregorianYear++;                      dayOfYear = 1;                      isGregorianLeap = IsGregorianLeapYear(gregorianYear);                  }                  sectionalTerm = SectionalTerm(gregorianYear, gregorianMonth);                  principleTerm = PrincipleTerm(gregorianYear, gregorianMonth);              }              chineseDate++;              days = DaysInChineseMonth(chineseYear, chineseMonth);              if (chineseDate > days)              {                  chineseDate = 1;                  chineseMonth = NextChineseMonth(chineseYear, chineseMonth);                  if (chineseMonth == 1) chineseYear++;              }          }      }  }

初始化类之后，使用方法ComputeChineseFields()即可获得农历相关字段。