索引器的重载的一个例子

//--------------------------------------
// 索引器的重载
// 索引器永远属于实例成员，所以不能为static
//--------------------------------------
using System;
using System.Collections.Generic;
using System.Collections;

namespace indexoverLoad
{
    class MainClass
    {
        public static void Main(string[] args)
        {
            IndexClass indexclass = new IndexClass();
            indexclass[0] = "张三";
            indexclass[1] = "李四";
            indexclass[2] = "王五";
            
            Console.WriteLine(indexclass[0]);
            Console.WriteLine(indexclass[1]);
            Console.WriteLine(indexclass[2]);
            
            IndexStringClass indexStringClass = new IndexStringClass();
            indexStringClass[1] = "001号";
            indexStringClass[2] = "002号";
            indexStringClass[3] = "003号";
            
            Console.WriteLine(indexStringClass["001号"]);
            Console.WriteLine(indexStringClass["002号"]);
            Console.WriteLine(indexStringClass["003号"]);
            
            Console.ReadKey();
        }
    }
    class IndexClass
    {
        private string[] name = new string[10];
        public string this[int index]
        {
            get{return name[index];}
            set
            {
                if(index >= 0 && index<10)
                    name[index] = value;
            }
            
        }
    }
    class IndexStringClass
    {
        private Hashtable name = new Hashtable();
        
        public string this[int index]
        {
            get{return name[index].ToString();}
            set
            {
                name.Add(index,value);
            }    
        }

        public int this[string _name]
        {
            
            get
            {
                foreach (DictionaryEntry d in name)
                {
                    if(d.Value.ToString() == _name)
                    {
                        return Convert.ToInt32(d.Key);
                    }
                }
                return -1;
            }
            set
            {
                name.Add(value,_name);
            }
        }
        
    }
}