索引器的使用

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

namespace 索引器
{
    class Program
    {
        static void Main(string[] args)
        {
            Program pr = new Program();
            pr[1] = "天马";
            pr[2] = "将军";
            Console.WriteLine(pr[1]);
            Console.WriteLine(pr[2]);
            Console.WriteLine(pr["nihao",1,1]);
            Console.ReadKey();
            
        }
        public string fristName = "你好";
        public string secondName = "我好";
        /// <summary>
        /// 只读的索引器
        /// </summary>
        /// <param name="name">任意string值</param>
        /// <param name="x">任意int的值</param>
        /// <param name="y">任意int的值</param>
        /// <returns></returns>
        public string this[string name,int x,int y]
        {
            get
            {
              return name+x+y;
            }

        }
        /// <summary>
        /// 创建一个索引器
        /// </summary>
        /// <param name="id">索引号</param>
        /// <returns>返回的是string的值</returns>
        public string this[int id]
        {
          set
          {
             if(id==1)
             {
                fristName = value;

             }
             else if (id == 2)
             {
                 secondName = value;
             }
             else
             {
                 throw new Exception();
             }
          }
          get
          {
              if (id == 1)
              {
                  return fristName;
              }
              else if (id == 2)
              {
                  return secondName;
              }
              else
              {
                  throw new Exception();
              }
          }

        }
    }
}