弱事件管理器及WeakEventManager,IWeakEventListener的使用

CarDealer类发布事件，Consumer类（实现IWeakEventListener接口）订阅事件

实现代码如下：

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Windows;

namespace ConsoleDelegate

 class Program

 static void Main(string[] args)

 CarDealer dealer = new CarDealer("Obama");

 Consumer Jack = new Consumer("Jack");

 WeakCarInfoEventManager.AddListener(dealer, Jack);

 dealer.NewCar("BMW");

 Consumer Bidden = new Consumer("Bidden");

 WeakCarInfoEventManager.AddListener(dealer, Bidden);

 dealer.NewCar("EAGLE");

 public class CarInfoEventArgs : EventArgs

 public CarInfoEventArgs(string name)

 this.Car = name;

 public string Car { get; private set; }

 public class CarDealer

 private string name;

 public CarDealer(string name)

 this.name = name;

 public event EventHandler CarInfoEventArgs NewCarInfo;

 public void NewCar(string car)

 Console.WriteLine("{0}, New Car: {1}", name, car);

 NewCarInfo(this, new CarInfoEventArgs(car));

 public class Consumer : IWeakEventListener

 private string name;

 public Consumer(string name)

 this.name = name;

 private void NewCarIsHere(object sender, CarInfoEventArgs e)

 Console.WriteLine("{0}, new car :{0} is here............", name, e.Car);

 bool IWeakEventListener.ReceiveWeakEvent(Type managerType, object source, EventArgs e)

 NewCarIsHere(source, e as CarInfoEventArgs);

 return true;

 public class WeakCarInfoEventManager : WeakEventManager

 public static void AddListener(object source,IWeakEventListener e)

 CurrentManager.ProtectedAddListener(source, e);

 public static void RemoveListener(object source, IWeakEventListener e)

 CurrentManager.ProtectedRemoveListener(source, e);

 public static WeakCarInfoEventManager CurrentManager

 WeakCarInfoEventManager manager = GetCurrentManager(typeof(WeakCarInfoEventManager)) 

 as WeakCarInfoEventManager;

 if(manager ==null)

 manager = new WeakCarInfoEventManager();

 SetCurrentManager(typeof(WeakCarInfoEventManager), manager);

 return manager;

 protected override void StartListening(object source)

 (source as CarDealer).NewCarInfo += CarDealer_NewCarInfo;

 public void CarDealer_NewCarInfo(object sender, CarInfoEventArgs e)

 DeliverEvent(sender, e);

 protected override void StopListening(object source)

 (source as CarDealer).NewCarInfo += CarDealer_NewCarInfo;

转载：http://blog.csdn.net/foreverling/article/details/38312927

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