公历转换农历算法

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace AlgorithmPractice
{
public partial class 公历转农历 : Form
{
public 公历转农历()
{
InitializeComponent();
}
private void 公历转农历_Load(object sender, EventArgs e)
{
BindYear();
this.cbYear.SelectedItem = DateTime.Now.Year;
this.cbMonth.SelectedItem = DateTime.Now.Month;
this.cbDay.SelectedItem = DateTime.Now.Day;
btnChange_Click(sender,e);
}
//绑定年份
public void BindYear()
{
List<int> arrYear = new List<int>();
for (int i = 0; i <= 2101 - 1901; i++)
{
arrYear.Insert(i, 1901 + i);
}
this.cbYear.DataSource = arrYear;
}
//月份随年份而变
private void cbYear_SelectedIndexChanged(object sender, EventArgs e)
{
int[] year1901 = { 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12 };
int[] year2101 = { 1 };
int[] yearOther = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12 };
if (this.cbYear.Text == "1901")
{
this.cbMonth.DataSource = year1901;
}
else if (this.cbYear.Text == "2101")
{
this.cbMonth.DataSource = year2101;
}
else
{
this.cbMonth.DataSource = yearOther;
}
}
//开始转换
private void btnChange_Click(object sender, EventArgs e)
{
try
{
string date = this.cbYear.Text + "-" + cbMonth.Text + "-" + cbDay.Text;
DateTime dt = Convert.ToDateTime(date);
this.lblNongLi.Text = SolarToChineseLunisolarDate(dt);
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}
/// <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>
public static string SolarToChineseLunisolarDate(DateTime solarDateTime)
{

//微软的ChineseLunisolarCalendar 方法支持时间范围是[1901－2-19,2101-1-28]
System.Globalization.ChineseLunisolarCalendar cal = new System.Globalization.ChineseLunisolarCalendar();
int year = cal.GetYear(solarDateTime);//农历年份
int month = cal.GetMonth(solarDateTime);//有闰月时该值可能为13，即leapMonth <= month ? month - 1 : month表示实际农历月份
int day = cal.GetDayOfMonth(solarDateTime);//农历天数
int leapMonth = cal.GetLeapMonth(year);//此年份闰几月，闰n月则返回n+1,如闰4月返回值为5；没有闰月返回0
String impday = "";//一年中的农历节日
String leapMonthStr = leapMonth > 0 ? "(闰" + (leapMonth - 1).ToString() + "月)" : "";//闰月份
int monthtrue = leapMonth > 0 && leapMonth <= month ? month - 1 : month;//把闰月计算进去之后真正的农历月份
if (monthtrue == 1 && day == 1)
{
impday = "春节";
}
else if (monthtrue == 5 && day == 5)
{
impday = "端午";
}
else if (monthtrue == 8 && day == 15)
{
impday = "中秋";
}
String month2 = String.Format("{0}{1}月", month == leapMonth ? "闰" : ""
, "无正二三四五六七八九十冬腊"[monthtrue]
);
String day2 = string.Format("{0}{1}"
, "初十廿三"[day == 10 ? 0 : day / 10]
, "十一二三四五六七八九"[day % 10]
);
String date = year + "年" + month2 + day2;

if (impday != "")
{
return date + leapMonthStr + " " + "祝您" + impday + "节快乐 ^-^";
}
else
return date + leapMonthStr;
}
//日子随月份改变
private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
{
if (String.IsNullOrEmpty(this.cbYear.Text.Trim()))
{
MessageBox.Show("年份不能为空！");
return;
}
try
{
int[] month31 = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31 };
int[] month30 = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30 };
int[] month29 = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29 };
int[] month28 = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28 };
int[] month190102 = { 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29 };
int[] month210101 = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28 };
String strmonth = this.cbMonth.Text.Trim();
String stryear = this.cbYear.Text.Trim();
if (stryear == "1901" && strmonth == "2")
{
this.cbDay.DataSource =month190102;
}
else if (stryear == "2101" && strmonth == "1")
{
this.cbDay.DataSource = month210101;
}
else
{
if (strmonth == "1" || strmonth == "3" || strmonth == "5" || strmonth == "7" || strmonth == "8" || strmonth == "10" || strmonth == "12")
{
this.cbDay.DataSource = month31;
}
else if (strmonth == "4" || strmonth == "9" || strmonth == "6" || strmonth == "11")
{
this.cbDay.DataSource = month30;
}
else if (strmonth == "2")
{
if (System.DateTime.IsLeapYear(Convert.ToInt32(this.cbYear.Text.Trim())) == true)
{
this.cbDay.DataSource = month29;//闰年
}
else
{
this.cbDay.DataSource = month28;
}
}
}
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}

}
}