设计模式之美：Manager（管理器）

 1 namespace ManagerPattern.Implementation1
 2 {
 3   public class Book
 4   {
 5     public Book(string isbn, string authors, string title)
 6     {
 7       this.ISBN = isbn;
 8       this.Authors = authors;
 9       this.Title = title;
10     }
11 
12     public string ISBN { get; private set; }
13     public string Authors { get; private set; }
14     public string Title { get; private set; }
15 
16     public string Publisher { get; set; }
17     public Image Cover { get; set; }
18 
19     public string GetTableOfContents()
20     {
21       return "something";
22     }
23   }
24 
25   public class BookManager
26   {
27     private Dictionary<string, Book> _books
28       = new Dictionary<string, Book>();
29 
30     public BookManager()
31     {
32     }
33 
34     public Book AddBook(string isbn, string authors, string title)
35     {
36       Book book = new Book(isbn, authors, title);
37       _books.Add(book.ISBN, book);
38       return book;
39     }
40 
41     public Book GetBookByISBN(string isbn)
42     {
43       Book book;
44       _books.TryGetValue(isbn, out book);
45       return book;
46     }
47 
48     public IEnumerable<Book> FindBooksOfAuthor(string author)
49     {
50       return _books.Values.Where(b => b.Authors.Contains(author));
51     }
52   }
53 
54   public class Client
55   {
56     public void TestCase1()
57     {
58       BookManager manager = new BookManager();
59       manager.AddBook("xxxx-xxxx-xxxx", "Dennis Gao", "Good Man");
60       Book book = manager.GetBookByISBN("xxxx-xxxx-xxxx");
61       book.GetTableOfContents();
62     }
63   }
64 }