.net事件模型

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication3
{
    class Program
    {
        static void Main(string[] args)
        {
            BookStore bs = new BookStore();
            bs.AfterAddedBook += (Object b) => { Book bb = (Book)b; Console.WriteLine(bb.name + "@@" + bb.prise); };
            bs.AfterAddedBook += new BookStore.BookHandle(new Program().tip);
            Book book = new Book();
            book.name = "C#编程设计";
            book.prise = 100;
            bs.AddInBook(book);
        }
        void tip(Object b)
        {
            Book bb = (Book)b;
            Console.WriteLine(bb.name + "@" + bb.prise + "新书  入库");
        }
    }


    public class BookStore
    {
        public List<Book> books { get; set; }
        public delegate void BookHandle(Object obj);
        public event BookHandle AfterAddedBook;
        public BookStore()
        {
            this.books = new List<Book>();
        }
        public void AddInBook(Book b)
        {
            books.Add(b);
            if (AfterAddedBook != null)
            {
                AfterAddedBook(b);
            }
        }

    }
    public class Book
    {
        public string name { get; set; }
        public int prise { get; set; }
    }
}