一、代码如下：

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;
using System.Globalization;

namespace PowerCalendar
{
    /// <summary>
    /// 万年历
    /// </summary>
    public partial class Form1 : Form
    {
        const string CelestlalStem = "甲乙丙丁戊己庚辛壬癸";
        const string TerrestrialBranch = "子丑寅卯辰已午未申酉戌亥";
        const string TeeYear = "鼠牛虎兔龙蛇马羊猴鸡狗猪";
        string[] ChinesDayNames;
        string[] ChinesMonthNames = new string[12] { "正", "二", "三", "四", "五", "六", "七", "八", "九", "十", "冬", "腊" };
        const string ChineseFormat = "{0}{1}年{2}月{3} {4}年";
        ChineseLunisolarCalendar calendar = new ChineseLunisolarCalendar();
        public Form1()
        {
            InitializeComponent();
            ChinesDayNames = new string[31]{"初一", "初二","初三","初四","初五","初六","初七","初八","初九","初十","十一","十二","十三","十四",
                                                 "十五","十六","十七","十八","十九","廿十","廿一","廿二","廿三","廿四","廿五","廿六","廿七","廿八","廿九","卅十","卅一"};
        }


        private void monthCalendar1_DateSelected(object sender, DateRangeEventArgs e)
        {
            this.toolTip1.Show(GetStemBranch(monthCalendar1.SelectionStart), this.monthCalendar1, this.monthCalendar1.Location, 5000);
            this.label1.Text = GetStemBranch(monthCalendar1.SelectionStart);
        }

        /// <summary>
        /// 显示今天日期
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void Form1_Load(object sender, EventArgs e)
        {
            label1.Text=GetStemBranch(this.monthCalendar1.TodayDate);
            label1.BackColor=Color.Wheat;
        }

        /// <summary>
        /// 返回阴历日期
        /// </summary>
        /// <param name="date"></param>
        /// <returns></returns>
        public string GetStemBranch(DateTime date)
        {
            int year = calendar.GetSexagenaryYear(date);
            int celestial = calendar.GetCelestialStem(year);
            int branch = calendar.GetTerrestrialBranch(year);
            return string.Format(ChineseFormat, CelestlalStem[celestial - 1], TerrestrialBranch[branch - 1], GetMonth(date), GetDayDate(date), GetYear(date));
        }
        /// <summary>
        /// 返回阴历月份
        /// </summary>
        /// <param name="date"></param>
        /// <returns></returns>
        public string GetMonth(DateTime date)
        {
            int month = calendar.GetMonth(date);
            bool isLeap = false;
            if (calendar.IsLeapMonth(calendar.GetYear(date), calendar.GetMonth(date)))//闰月的话月份减一
            {
                month--;
                isLeap = true;
            }

            return (isLeap?"闰":"")+ChinesMonthNames[month - 1];

        }

        /// <summary>
        /// 返回阴历天的记法
        /// </summary>
        /// <param name="time"></param>
        /// <returns></returns>
        public string GetDayDate(DateTime time)
        {

            int day = calendar.GetDayOfMonth(time);
            return ChinesDayNames[day - 1];
        }
        /// <summary>
        /// 返回阴历年的记法
        /// </summary>
        /// <param name="date"></param>
        /// <returns></returns>
        public string GetYear(DateTime date)
        {

            int year = calendar.GetSexagenaryYear(date);//60甲子年
            int branch = calendar.GetTerrestrialBranch(year);//地支
            return TeeYear[branch-1].ToString();

        }
    }
}

二、效果：