using System;

 using System.Collections.Generic;

 using System.Linq;

 using System.Text;

 namespace InnerList

 {

     class Program

     {

         static void Main(string[] args)

         {

             strList sl = new strList();

             sl.Add("A");

             sl.Add("B");

             sl.Add("C");

             Console.WriteLine(sl[]);

             sl.Remove("A");

             Console.WriteLine(sl[]);

             Console.ReadKey();

         }

     }

     /// <summary>

     /// 用System.Collections.CollectionBase定义一个存储字符类型的列表类

     /// </summary>

     public class strList : System.Collections.CollectionBase

     {

         /// <summary>

         /// 像列表中添加字符串

         /// </summary>

         /// <param name="str"></param>

         public void Add(string str)

         {

             base.InnerList.Add(str);

         }

         /// <summary>

         /// 从列表中一处移除字符串

         /// </summary>

         /// <param name="str"></param>

         public void Remove(string str)

         {

             base.InnerList.Remove(str);

         }

         /// <summary>

         /// 根据索引号，查找指定字符串

         /// </summary>

         /// <param name="Index"></param>

         /// <returns></returns>

         public string this[int Index]

         {

             get { return ((string)List[Index]); }

             set { List[Index] = value; }

         }

     }

 }