用Observer实现的Stock代码

Stock

public delegate void PriceChangeDelegate(Stock aStock);
    public class Stock
    }

Inversotr

interface IInvestor
    }

前台程序

            ObserverAdvance.Inverstor Koffer = new ObserverAdvance.Inverstor("My WebSite");
            ObserverAdvance.Stock HuaxiaStock = new ObserverAdvance.Stock("HuaXiaIT",100);
            HuaxiaStock.PriceChangeHandler += new ObserverAdvance.PriceChangeDelegate(Koffer.Update);
            
            HuaxiaStock.Price = 200;
            HuaxiaStock.Notify();