using System;using System.Collections.Generic;using System.Text;namespace Pattern.Iterator
{
/// <summary>
/// Message实体类
/// </summary> public class MessageModel { /// <summary> /// 构造函数 /// </summary> /// <param name="msg">Message内容</param> /// <param name="pt">Message发布时间</param> public MessageModel(string msg, DateTime pt) { this._message = msg; this._publishTime = pt; } private string _message; /// <summary> /// Message内容 /// </summary> public string Message { get { return _message; } set { _message = value; } } private DateTime _publishTime; /// <summary> /// Message发布时间 /// </summary> public DateTime PublishTime { get { return _publishTime; } set { _publishTime = value; } } }
}using System;using System.Collections.Generic;using System.Text;namespace Pattern.Iterator{ /// <summary> /// 集合接口（Aggregate） /// </summary> public interface ICollection { /// <summary> /// 创建迭代器对象 /// </summary> /// <returns></returns> IIterator CreateIterator(); }}using System;using System.Collections.Generic;using System.Text;namespace Pattern.Iterator{ /// <summary> /// 集合（ConcreteAggregate） /// </summary> public class Collection : ICollection { private List<MessageModel> list = new List<MessageModel>(); /// <summary> /// 创建迭代器对象 /// </summary> /// <returns></returns> public IIterator CreateIterator() { return new Iterator(this); } /// <summary> /// 集合内的对象总数 /// </summary> public int Count { get { return list.Count; } } /// <summary> /// 索引器 /// </summary> /// <param name="index">index</param> /// <returns></returns> public MessageModel this[int index] { get { return list[index]; } set { list.Add(value); } } }}using System;using System.Collections.Generic;using System.Text;namespace Pattern.Iterator{ /// <summary> /// 迭代器接口（IIterator） /// </summary> public interface IIterator { /// <summary> /// 第一个对象 /// </summary> /// <returns></returns> MessageModel First(); /// <summary> /// 下一个对象 /// </summary> /// <returns></returns> MessageModel Next(); /// <summary> /// 当前对象 /// </summary> MessageModel CurrentMessageModel { get; } /// <summary> /// 是否迭代完毕 /// </summary> bool IsDone { get; } }}using System;using System.Collections.Generic;using System.Text;namespace Pattern.Iterator{ /// <summary> /// 迭代器（Iterator） /// </summary> public class Iterator : IIterator { private Collection _collection; private int _current = 0; private int _step = 1; /// <summary> /// 构造函数 /// </summary> /// <param name="collection"></param> public Iterator(Collection collection) { this._collection = collection; } /// <summary> /// 第一个对象 /// </summary> /// <returns></returns> public MessageModel First() { _current = 0; return _collection[_current]; } /// <summary> /// 下一个对象 /// </summary> /// <returns></returns> public MessageModel Next() { _current += _step; if (!IsDone) { return _collection[_current]; } else { return null; } } /// <summary> /// 当前对象 /// </summary> public MessageModel CurrentMessageModel { get { return _collection[_current]; } } /// <summary> /// 是否迭代完毕 /// </summary> public bool IsDone { get { return _current >= _collection.Count ? true : false; } } /// <summary> /// 步长 /// </summary> public int Step { get { return _step; } set { _step = value; } } }}using System;using System.Data;using System.Configuration;using System.Collections;using System.Web;using System.Web.Security;using System.Web.UI;using System.Web.UI.WebControls;using System.Web.UI.WebControls.WebParts;using System.Web.UI.HtmlControls;using I = Pattern.Iterator;public partial class Iterator : System.Web.UI.Page{ protected void Page_Load(object sender, EventArgs e) { I::Collection collection = new I::Collection(); collection[0] = new I::MessageModel("第1条信息", DateTime.Now); collection[1] = new I::MessageModel("第2条信息", DateTime.Now); collection[2] = new I::MessageModel("第3条信息", DateTime.Now); collection[3] = new I::MessageModel("第4条信息", DateTime.Now); collection[4] = new I::MessageModel("第5条信息", DateTime.Now); collection[5] = new I::MessageModel("第6条信息", DateTime.Now); collection[6] = new I::MessageModel("第7条信息", DateTime.Now); collection[7] = new I::MessageModel("第8条信息", DateTime.Now); collection[8] = new I::MessageModel("第9条信息", DateTime.Now); I::Iterator iterator = new I::Iterator(collection); iterator.Step = 2; for (I::MessageModel mm = iterator.First(); !iterator.IsDone; mm = iterator.Next()) { Response.Write(mm.Message); Response.Write("<br />"); } }}乐在其中设计模式(C#) - 迭代器模式(Iterator Pattern),布布扣,bubuko.com
乐在其中设计模式(C#) - 迭代器模式(Iterator Pattern)
原文：http://www.cnblogs.com/lonelyxmas/p/3590355.html
