经典代码，事件模式：EVent Model

using System;

namespace EventModel
{
    /**//// <summary>
    /// stock 的摘要说明。
    /// </summary>
    public class stock
    {
        public delegate void AskPriceChangeHandler(object sender,AskPriceChangedEventArgs e);
        public event AskPriceChangeHandler AskPriceChanged;

        object _askPrice;

        public object AskPrice
        {
            set
            {
                _askPrice=value;
                OnAskPriceChanged();

            }            
        }

        protected void OnAskPriceChanged()
        {
            AskPriceChanged(this,new AskPriceChangedEventArgs(_askPrice));
        }

        public stock()
        {
            //
            // TODO: 在此处添加构造函数逻辑
            //
        }
    }

    public class AskPriceChangedEventArgs:EventArgs
    {
        private object _askPrice;
        public AskPriceChangedEventArgs(object askPrice)
        {
            _askPrice=askPrice;
        }
        public object AskPrice
        {
            get
            {
                return _askPrice;
            }
        }

    }

    public class stockDisplay
    {
        public void AskPriceChanged(object aPrice)
        {
            Console.WriteLine("The new ask price is "+aPrice+" ");
        }
    }



}

 

使用这几个类：

 

using System;

namespace EventModel
{
    /**//// <summary>
    /// Class1 的摘要说明。
    /// </summary>
    class Class1
    {
        /**//// <summary>
        /// 应用程序的主入口点。
        /// </summary>
        [STAThread]
        static void Main(string[] args)
        {
            //
            // TODO: 在此处添加代码以启动应用程序
            //

            stock sk=new stock();
            sk.AskPriceChanged+=new EventModel.stock.AskPriceChangeHandler(sk_AskPriceChanged);    
            
            for(int i=0;i<100;i++)
                sk.AskPrice=i;

        }

        private static void sk_AskPriceChanged(object sender, AskPriceChangedEventArgs e)
        {
            Console.WriteLine(e.AskPrice);

        }
    }
}