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      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
    
      ; }
 }
}