序列化在c#中实现IEnumerable的自定义泛型类型

using System;
using System.Collections;

public class MyCollection<T> : IEnumerable
{
    private T[] items;
    private int count;

    public MyCollection()
    {
        items = new T[4];
        count = 0;
    }

    public void Add(T item)
    {
        if (count == items.Length)
        {
            Array.Resize(ref items, items.Length * 2);
        }

        items[count++] = item;
    }

    public IEnumerator GetEnumerator()
    {
        return new MyEnumerator<T>(items, count);
    }
}

public class MyEnumerator<T> : IEnumerator
{
    private T[] items;
    private int count;
    private int position;

    public MyEnumerator(T[] items, int count)
    {
        this.items = items;
        this.count = count;
        position = -1;
    }

    public bool MoveNext()
    {
        position++;
        return (position < count);
    }

    public void Reset()
    {
        position = -1;
    }

    public object Current
    {
        get { return items[position]; }
    }
}

public class Program
{
    public static void Main(string[] args)
    {
        MyCollection<int> collection = new MyCollection<int>();
        collection.Add(1);
        collection.Add(2);
        collection.Add(3);

        foreach (int item in collection)
        {
            Console.WriteLine(item);
        }
    }
}