System.DateTime.Now.DayOfWeek和System.DateTime.Today.DayOfWeek的区别

Question

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;namespace 枚举类型的使用及获取当前时间
{
    class Program
    {
        enum MyDate { Sun, Mon, Tue, Wed, Thi, Fri, Sat }//默认时，第一个成员的值是0
        static void Main(string[] args)
        {
               int k = (int)DateTime.Now.DayOfWeek;//获取当前时间
                switch(k)
                {
                    case (int )MyDate.Sun:Console.WriteLine("今天是星期日");break;
                    case (int )MyDate.Mon:Console.WriteLine("今天是星期一");break;
                    case (int )MyDate.Tue:Console.WriteLine("今天是星期二");break;
                    case (int )MyDate.Wed:Console.WriteLine("今天是星期三");break;
                    case (int )MyDate.Thi:Console.WriteLine("今天是星期四");break;
                    case (int )MyDate.Fri:Console.WriteLine("今天是星期五");break;
                    case (int)MyDate.Sat: Console.WriteLine("今天是星期六"); break;            }
            /*或者
              int i=Convert.ToInt32(DateTime.Today.DayOfWeek);
              switch(i)
              {
               case 1:Console.WriteLine("今天是星期一");break;
               case 2:Console.WriteLine("今天是星期二");break;
               case 3:Console.WriteLine("今天是星期三");break;
               case 4:Console.WriteLine("今天是星期四");break;
               case 5:Console.WriteLine("今天是星期五");break;
               case 6:Console.WriteLine("今天是星期六");break;
               case 7:Console.WriteLine("今天是星期日");break;
                }*/
           //  DateTime.Now.DayOfWeek的周日是零，而DateTime.Today.DayOfWeek是七                 }
    }
}

Answer 1

int week = (int)DateTime.Today.DayOfWeek; 
if (week == 0) week = 7; //周日 
beginDate = DateTime.Today.AddDays(-(week - 1)); 
endDate = beginDate.AddDays(6);