C#获取农历

///<summary>
/// 实例化一个 ChineseLunisolarCalendar
///</summary>
private static ChineseLunisolarCalendar ChineseCalendar = new ChineseLunisolarCalendar();

///<summary>
/// 十天干
///</summary>
privatestaticstring[] tg = { "甲" , "乙" , "丙" , "丁" , "戊" , "己" , "庚" , "辛" , "壬" , "癸" };

///<summary>
/// 十二地支
///</summary>
privatestaticstring[] dz = { "子" , "丑" , "寅" , "卯" , "辰" , "巳" , "午" , "未" , "申" , "酉" , "戌" , "亥" };

///<summary>
/// 十二生肖
///</summary>
privatestaticstring[] sx = { "鼠" , "牛" , "虎" , "免" , "龙" , "蛇" , "马" , "羊" , "猴" , "鸡" , "狗" , "猪" };

///<summary>
/// 返回农历天干地支年
///</summary>
///<param name="year">农历年</param>
///<returns></returns>
publicstaticstring GetLunisolarYear( int year)
 {
if (year >3)
 {
int tgIndex = (year -4) %10;
int dzIndex = (year -4) %12;

returnstring.Concat(tg[tgIndex], dz[dzIndex], "[" , sx[dzIndex], "]" );
 }

thrownew ArgumentOutOfRangeException( "无效的年份!" );
 }

///<summary>
/// 农历月
///</summary>

///<returns></returns>
privatestaticstring[] months = { "正" , "二" , "三" , "四" , "五" , "六" , "七" , "八" , "九" , "十" , "十一" , "十二(腊)" };

///<summary>
/// 农历日
///</summary>
privatestaticstring[] days1 = { "初" , "十" , "廿" , "三" };
///<summary>
/// 农历日
///</summary>
privatestaticstring[] days = { "一" , "二" , "三" , "四" , "五" , "六" , "七" , "八" , "九" , "十" };


///<summary>
/// 返回农历月
///</summary>
///<param name="month">月份</param>
///<returns></returns>
publicstaticstring GetLunisolarMonth( int month)
 {
if (month <13&& month >0)
 {
return months[month -1];
 }

thrownew ArgumentOutOfRangeException( "无效的月份!" );
 }

///<summary>
/// 返回农历日
///</summary>
///<param name="day">天</param>
///<returns></returns>
publicstaticstring GetLunisolarDay( int day)
 {
if (day >0&& day <32)
 {
if (day !=20&& day !=30)
 {
returnstring.Concat(days1[(day -1) /10], days[(day -1) %10]);
 }
else
 {
returnstring.Concat(days[(day -1) /10], days1[1]);
 }
 }

thrownew ArgumentOutOfRangeException( "无效的日!" );
 }



///<summary>
/// 根据公历获取农历日期
///</summary>
///<param name="datetime">公历日期</param>
///<returns></returns>
publicstaticstring GetChineseDateTime(DateTime datetime)
 {
int year = ChineseCalendar.GetYear(datetime);
int month = ChineseCalendar.GetMonth(datetime);
int day = ChineseCalendar.GetDayOfMonth(datetime);
//获取闰月， 0 则表示没有闰月
int leapMonth = ChineseCalendar.GetLeapMonth(year);

bool isleap = false ;

if (leapMonth >0)
 {
if (leapMonth == month)
 {
//闰月
isleap = true ;
 month--;
 }
elseif (month > leapMonth)
 {
 month--;
 }
 }

returnstring.Concat(GetLunisolarYear(year), "年" , isleap ? "闰" : string .Empty, GetLunisolarMonth(month), "月" , GetLunisolarDay(day));
 }