索引

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

 

namespace _9.索引

{

    class Program

    {

        static void Main(string[] args)

        {

            int[] values = { 3,5,7,9};

            int i = values[1];

 

            Person p1 = new Person();

            p1[1] = "小明";

            Console.WriteLine(p1[1]+p1[2]);

 

            Console.WriteLine(p1["tom",3,9]);//索引也可以重载。

            Console.ReadKey();

        }

    }

 

    class Person

    {

        private string FirstName="大毛";

        private string SecondName="二毛";

 

        public string this[string name, int x, int y]

        {

            get

            {

                return name + x + y;

            }

        }

        public string this[int index]//中括号里的就是索引。

        {

            get

            {

                if (index == 1)

                {

                    return FirstName;

                }

                else if (index == 2)

                {

                    return SecondName;

                }

                else

                {

                    throw new Exception("这是个错误的序号啊亲！");

                }

            }

            set

            {

                if (index == 1)

                {

                    FirstName = value;

                }

                else if (index == 2)

                {

                    SecondName = value;

                }

                else

                {

                    throw new Exception("这是个错误的序号啊亲！");

                }

            }

        }

    }

}