(IT的事就是过场多,过场多了就容易忘,所以我们不妨看一个记一个,这也是一个办法,顺便还能跟同行们交流一下)
要和老婆一起回老家了, 成都离我们安徽太远, 两个人飞一下过去就要花掉近三千块, 于是我们决定找找有没有更便宜的机票,
"你帮我找找吧, 如果找到的话,跟我说一下",我说道.
"行!"老婆记住了这事.
很快我得到通知, 南航有更便宜的, 580块.
这是一个简单的observer模式.
什么是observer? 其定义如下:
The Observer Patern defines a one-to-many dependency betwen objects so that when one object changes state, all its dependents are notified and updated automatically.
大概结构来描述就如下:
其中Neo(就是我以前在IT混日子的马甲拉)是继承于TicketBuyer这个抽象类的, 为什么这里要加一个抽象类,因为老婆表兄妹多, 都有可能找她订票, 所以要把这些表兄妹的行为抽象到一个公共的抽象类上.
using System;
using System.Collections.Generic; public abstract class TicketBuyer
{
public int TicketPrice;
public string Airline;
} public class Neo: TicketBuyer
{
private int _ticketPrice;
private string _airline; public int TicketPrice
{
get {return _ticketPrice;}
set {_ticketPrice = value;}
} public string Airline
{
get{return _airline;}
set{_airline = value;}
}
}
public class FeiFei
{
private string _airline;
private int _ticketPrice; IList<TicketBuyer> _ticketBuyers; public FeiFei()
{
_ticketBuyers = new List<TicketBuyer>();
} public void AddTicketBuyer(TicketBuyer t)
{
_ticketBuyers.Add(t);
} public void DeleteTicketBuyer(TicketBuyer t)
{
_ticketBuyers.Remove(t);
} public void NotifyTicketInformation()
{
SearchTicket();
foreach(TicketBuyer t in _ticketBuyers)
{
t.Airline = _airline;
t.TicketPrice = _ticketPrice;
}
} private void SearchTicket()
{
_airline = "China Southern";
_ticketPrice = 580;
}
}
运行代码看一下结果：
public class Test
{
public static void Main()
{
TicketBuyer n = new Neo();
FeiFei f = new FeiFei();
f.AddTicketBuyer(n);
f.NotifyTicketInformation();
Console.WriteLine("Airline:" + n.Airline + ", price:" + n.TicketPrice);
Console.Read();
}
}
好了，以上是个人对Observer模式的理解，如有不正确的地方，希望同行能帮我纠正。
谢谢大家！