C# 索引器

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

namespace SuoYinQiTest
{
    
    class Persons
    {
        private int currentIndex = 0;
        private String[] names = new String[10];
        public String this[int index]{
            get
            {
                return names[index];
            }
            set
            {
                names[index] = value;
                currentIndex++;
            }
        }
        public void printAll()
        {
            for (int i = 0; i < currentIndex; i++)
            {
                Console.WriteLine(names[i]);
            }
            Console.WriteLine("输出完毕");
        }
    }
    class Program
    {
        static void Main(string[] args)
        {
            Persons persons = new Persons();
            persons[0] = "zhangsan";
            persons[1] = "lisi";
            persons.printAll();
            Console.Read();
        }
    }
}