控制台输出对应年份

using System;
using System.Text;

namespace ConsoleApp1
{
    class Program
    {
        static void Main(string[] args)
        {
            RiLi();
            Console.ReadKey();

        }
        /// <summary>
        /// 万年历
        /// </summary>
        static void RiLi()
        {
            Console.WriteLine("请输入年份：");
            int year = Convert.ToInt32(Console.ReadLine());
            while (year < 1900)
            {
                Console.WriteLine("请输入大于1900年的年份！");
                year = Convert.ToInt32(Console.ReadLine());
            }
            for (int i = 1; i < 13; i++)
            {
                //得到指定的年份和月它的天数
                int days = DateTime.DaysInMonth(year, i);
                //得到当前月的第一天
                DateTime currday = new DateTime(year, i, 1);
                //得到下月第一天
                DateTime lastday = currday.AddMonths(1);
                Console.WriteLine();
                Console.WriteLine("{0}年{1}月", year, i);
                Console.WriteLine("周日\t周一\t周二\t周三\t周四\t周五\t周六");
                while (currday < lastday)
                {
                    //如果日期为当月第一天
                    if (currday.Day == 1)
                    {
                        //获取当前日期是星期几
                        int weekday = Convert.ToInt32(currday.DayOfWeek);
                        //用于拼接字符串
                        StringBuilder sb = new StringBuilder();
                        for (int j = 0; j < weekday; j++)
                        {
                            sb.Append("\t");
                        }
                        Console.Write("{0}{1}", sb.ToString(), currday.Day);
                    }
                    else if (currday.DayOfWeek == DayOfWeek.Sunday) //如果当前日期是礼拜天
                    {
                        Console.WriteLine();
                        Console.Write("{0}", currday.Day);
                    }
                    else
                    {
                        Console.Write("\t{0}", currday.Day);
                    }
                    currday = currday.AddDays(1);//明天
                }
            }
        }
    }
}