//以字符串为下标的索引器
    public class IDXer2
    {
        private Hashtable name = new Hashtable();

        //以字符串为下标的索引器
        public string this[string index]
        {
            get
            {
                return name[index].ToString();
            }
            set
            {
                name.Add(index, value);
            }
        }
    }

    public class Program
    {
        static void Main(string[] args)
        {
            //以字符串为下标的索引器
            IDXer2 indexer2 = new IDXer2();
            indexer2["A01"] = "张三";
            indexer2["A02"] = "李四";
            Console.WriteLine(indexer2["A01"]);
            Console.WriteLine(indexer2["A02"]);
            Console.ReadKey();
        }  }