net2：类，事件与委托

原文发布时间为：2008-07-29 —— 来源于本人的百度文章 [由搬家工具导入]

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

public partial class Default2 : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        Book bk = new Book();
        bk.nameChg+= new Book.myEventHandler(bk_nameChg);
        bk.priceChg+=new Book.myEventHandler(bk_priceChg);
        bk.Name = "c";
        bk.Price = 123;
        Response.Write(bk.bookInfo());

    }
    void bk_nameChg()
    {
        Response.Write("title change"+"<br>");
    }
    void bk_priceChg()
    {
        Response.Write("price change" + "<br>");
    }
    public class Book
    {
        private string name;
        private double price;
        public delegate void myEventHandler();
        public event myEventHandler nameChg;
        public event myEventHandler priceChg;
        public Book()
        {
        }
        public Book(string nname, double nprice)
        {
            name = nname;
            price = nprice;
        }
        public string Name
        {
            get
            {
                return name;
            }
            set
            {
                name = value;
                nameChg();//这个事件触发

            }
        }

        public double Price
        {
            get
            {
                return price;
            }
            set
            {
                price = value;
                priceChg();
            }
        }
        public string bookInfo()
        {
            return "title:" + name + " price:" + price;
        }

    }
}