C#索引器

using System;

namespace 索引器
{
    class Program
    {
        static void Main(string[] args)
        {
            Phone a1 = new Phone("小米", 3000);
            Console.WriteLine(a1[0]);
            Console.WriteLine(a1[1]);
            Console.WriteLine(a1[3]);
            Console.WriteLine("-----------------------------------------");
            a1[0] = "华为";
            a1[1] = "5000";
            a1[3] = "诺基亚";
            Console.WriteLine(a1[0]);
            Console.WriteLine(a1[1]);
            Console.WriteLine(a1[3]);
            Console.ReadKey();
        }
    }

    public class Phone
    {
        public string name;
        public int price;
        public Phone(string name, int eag)
        {
            this.name = name;
            this.price = eag;
        }
        public string this[int index]
        {
            get
            {
                if (index == 0)
                {
                    return this.name;
                }
                else if (index == 1)
                {
                    return Convert.ToString(this.price);
                }
                else
                {
                    return "无法获取不存在的索引: " + index;
                }
            }
            set
            {
                if (index == 0)
                {
                    this.name = value;
                }
                else if (index == 1)
                {
                    this.price = Convert.ToInt32(value);
                }
                else
                {
                    Console.WriteLine("无法设置不存在的索引: " + index);
                }
            }
        }
    }
}