簡略的不雅察者形式示例分享

簡略的不雅察者形式示例分享。本站提示廣大學習愛好者：（簡略的不雅察者形式示例分享）文章只能為提供參考，不一定能成為您想要的結果。以下是簡略的不雅察者形式示例分享正文

using System;
using System.Collections.Generic;

namespace Demo
{
    #region 籠統層,界說了不雅察者形式
    /// <summary>
    /// （籠統）消息
    /// </summary>
    public interface INews
    {
        void SubScribe(ISubscriber s);
        void UnSubScribe(ISubscriber s);
        void Publish(string newsTitle);   //在詳細完成的進程中樹立宣布與定閱的接洽
    }

    /// <summary>
    /// (籠統）定閱者
    /// </summary>
    public interface ISubscriber
    {
        void Read(string newsTitle);
    }
    #endregion

    #region 完成層,是對籠統層的詳細完成
    /// <summary>
    /// （詳細）消息
    /// </summary>
    public class ITNews : INews
    {
        private List<ISubscriber> readers = new List<ISubscriber>();

        public void SubScribe(ISubscriber s)
        {
            readers.Add(s);
        }

        public void UnSubScribe(ISubscriber s)
        {
            if (readers.Count >= 0)
            {
                readers.Remove(s);
            }
        }

        public void Publish(string newsTitle)
        {
            foreach (ISubscriber i in readers)
            {
                i.Read(newsTitle);          //<<<<<宣布的時刻定閱>>>>>
            }
        }
    }

    /// <summary>
    /// (詳細)定閱者
    /// </summary>
    public class Subscriber : ISubscriber
    {
        private string subscriber = string.Empty;
        public Subscriber(string subscriber)
        {
            this.subscriber = subscriber;
        }

        public void Read(string newsTitle)
        {
            Console.WriteLine(string.Format("{0}浏覽了IT消息\"{1}\"", subscriber, newsTitle));
        }
    }
    #endregion

    public class Pro
    {
        static void Main(string[] args)
        {
            ITNews news = new ITNews();
            Subscriber zs = new Subscriber("張三"),
                                 ls = new Subscriber("李四"),
                                 ww = new Subscriber("王五");

            news.SubScribe(zs);
            news.SubScribe(ls);
            news.SubScribe(ww);
            news.UnSubScribe(ls);  //張三撤消定閱

            news.Publish("2014年挪動電商攻堅戰：阿裡巴巴若何破局？");
            news.Publish("余額寶還能重回高收益率嗎？");

            Console.WriteLine();
            Console.ReadKey();
        }
    }
}