泛型类

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Collections;

namespace Ienumerable
{
    class Program
    {
        static void Main(string[] args)
        {
            MyList<int> mylist = new MyList<int>();
            for (int x = 0; x < 5; x++)
            {
                mylist.Add(x);

            }
            foreach (int i in mylist)
            {
                Console.WriteLine(i);
            }
            Console.ReadKey();
        }
    }

    class MyList<T>:IEnumerable
    {
        #region MyItem
        private class MyItem
        {
            private MyItem next;
            private T data;
            public MyItem(T t)
            {
                next = null;
                data = t;
            }

            public MyItem Next
            {
                get { return next; }
                set { next = value; }
            }

            public T Data
            {
                get { return data; }
                set { data = value; }
            }
        }
        #endregion

        private MyItem myItem;
        public MyList()
        {
            myItem = null;
        }

        public void Add(T t)
        {
            MyItem n = new MyItem(t);
            n.Next = myItem;
            myItem = n;
        }

        #region IEnumerable 成员

        public IEnumerator<T> GetEnumerator()
        {
            MyItem currentItem = myItem;
            while (currentItem != null)
            {
                yield return currentItem.Data;
                currentItem = currentItem.Next;
            }
        }

        #endregion
    }
    
}