949
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
{
get
{
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;
}
}
}
最后更新：2017-04-03 05:39:36