.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; }
}
}