C#编程-97：索引器在类中的使用

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace ClassIndexTest
{
    class IndexTest
    {
        private int[] myint = new int[10];
        public int this[int index]
        {
            get { 
            if(index>=0 && index<=9) return myint[index];
            else
                return 0;
            }
            set {
                if (index >= 0 && index <= 9) myint[index] = value;
            }
        }
    }
    class WeekDay
    {
         private string[] weeks = { "星期一","星期二","星期三","星期四","星期五","星期六","星期日"};
         private int GetDay(string weekday)
         {
             int i = 1;
             foreach (string week in weeks)
             {
                 if (week == weekday) return i;
                 i++;
             }
             return 0;       
         }
         public int this[string week]
         {
             get { return GetDay(week); }
         }
    }
    class Program
    {
        static void Main(string[] args)
        {
            //访问类实例
            IndexTest array = new IndexTest();
            array[0] = 11;
            array[-5] = 12;
            array[3] = 14;
            array[5] = 15;
            array[11] = 16;
            Console.WriteLine("array[0]={0}", array[0]);
            Console.WriteLine("array[-5]={0}", array[-5]);
            Console.WriteLine("array[3]={0}", array[3]);
            Console.WriteLine("array[5]={0}", array[5]);
            Console.WriteLine("array[11]={0}", array[11]);
            Console.WriteLine("array[6]={0}", array[6]);
            //访问类成员
            WeekDay weekday = new WeekDay();
            Console.WriteLine(weekday["星期一"]);
            Console.WriteLine(weekday["星期二"]);
            Console.WriteLine(weekday["星期五"]);
            Console.WriteLine(weekday["星期八"]);
            Console.ReadKey();
        }
    }
}