面试，求救！

Question

题目是让用户输入日期，之后判断给定的一天是这一年的第几天，拜托各位大仙了...

Answer 1

DateTime da = DateTime.Parse("日期");int days =da.DayOfYear;

Answer 2

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("请输入日期：");
            string str = Console.ReadLine();
            DateTime dt = new DateTime();
            try
            {
                dt = DateTime.Parse(str);
                int year = dt.Year;
                DateTime dt0 = new DateTime(year, 1, 1);
                int days = (dt.Date - dt0.Date).Days + 1;
                Console.WriteLine(string.Format("天数是：{0}。",days.ToString()));
            }
            catch
            {
                Console.WriteLine("输入的日期格式不正确！");
            }
        }
    }
} 

Answer 3

参考
http://topic.csdn.net/u/20100730/19/2a974b28-cd10-4aec-aaa9-d6c0e3c37d5a.html

Answer 4

Console.WriteLine("*******{0}************","Welcome");
            Console.WriteLine("Please input the year:");
            String tempy = Console.ReadLine();
            Console.WriteLine("Please input the month:");
            String tempm = Console.ReadLine();
            Int32 year, month;            if (!Int32.TryParse(tempy, out year) || !Int32.TryParse(tempm, out month))
                return;            Int32 days = DateTime.DaysInMonth(year, month);
            Int32 i = (Int32)(new DateTime(year, month, 1).DayOfWeek);            Console.WriteLine("Su".PadLeft(5) + "Mo".PadLeft(5) + "Tu".PadLeft(5) + "We".PadLeft(5) + "Th".PadLeft(5) + "Fr".PadLeft(5) + "Sa".PadLeft(5));            Int32 size = 0;
            Int32 k = 0;
            while (k < i)
            {
                Console.Write("".PadLeft(5));
                k++;
                size++;
            }
            for (Int32 j = 1; j < days; j++)
            {
                Console.Write(j.ToString().PadLeft(5));
                size++;
                if (size % 7 == 0)
                    Console.WriteLine();
            }
            Console.WriteLine();