C#2.0范型---资源库模式

using System;
using System.Collections.Generic;
using System.Text;
using System.Collections;
namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            for (int i = 0; i < 100; i++)
            {
                Repository<Foo>.Instance.Add(new Foo(i));
            }
            Console.WriteLine(Repository<Foo>.Instance[9].Count);
            Console.ReadLine();
        }
    }

    public class Repository<T>
    {
        private static Repository<T> _instance;
        private ArrayList _list;

        public Repository()
        {
            _list = new ArrayList();
        }

        public static Repository<T> Instance
        {
            get
            {
                if (_instance == null)
                    _instance = new Repository<T>();
                return _instance;
            }
        }

        public T this[int index]
        {
            get
            {
                return (T)_list[index];
            }
        }

        public int Add(T t)
        {
            return _list.Add(t);
        }


    }

    partial class Foo
    {
        private int _count = 0;
        public Foo(int count)
        {
            _count = count;
        }

        public string Count
        {
            get
            {
                return _count.ToString();
            }
        }
    }
}