Program.cs

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

namespace EDC.DesignPattern.Iterator
{
    public class Program
    {
        public static void Main(string[] args)
        {
            IList<object> products = new List<object>();
            products.Add("倚天剑");
            products.Add("屠龙刀");
            products.Add("断肠草");
            products.Add("葵花宝典");
            products.Add("四十二章经");

            AbstractObjectList objectList = new ProductList(products);      // 创建聚合对象
            AbstractIterator iterator = objectList.CreateIterator();                // 创建迭代器对象

            Console.WriteLine("正向遍历");
            while (!iterator.IsLast())
            {
                Console.Write(iterator.GetNextItem() + ",");
                iterator.Next();
            }

            Console.WriteLine();
            Console.WriteLine("-------------------------------------------------------");
            Console.WriteLine("逆向遍历");
            while (!iterator.IsFirst())
            {
                Console.Write(iterator.GetPreviousItem() + ",");
                iterator.Previous();
            }

            Console.ReadKey();
        }
    }
}