C# 索引器练习

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApp3
{
    class Program
    {
        static void Main(string[] args)
        {
            fist fi = new fist();
            fi[1] = "xxx";
            Console.WriteLine(fi[1]);
            Console.ReadLine();
        }
    }

    public class fist
    {

        private string City = "广州";
        private string SecondCity = "佛山";

        public string this[int index]
        {
            get
            {
                if (index == 1)
                {
                    return City;
                }
                else if (index == 2)
                {
                    return SecondCity;
                }
                return "";
            }

            set {
                if (index == 1)
                {
                    City = value;
                }
                else if (index == 1)
                {
                    SecondCity = value;
                }
            }

        }
    }
}