using System;using System.Collections;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;namespace MyCollection{    class Program    {        static void Main(string[] args)        {            Collection names = new Collection();            names.Add("David");            names.Add("Bernica");            names.Add("Raymond");            foreach (Object name in names)            {                Console.WriteLine(name);            }        }    }    /// 
    /// 构造自己和集合类    /// 
    public class Collection:CollectionBase    {        // 增加        public void Add(Object item)        {            this.InnerList.Add(item);        }        // 删除        public void Remove(Object item)        {               this.InnerList.Remove(item);        }        // 总数，用new 关键字隐藏父类实现        public new int Count()        {            return InnerList.Count;        }        // 清空        public new void Clear()        {            this.InnerList.Clear();        }    }}