MULTICAST
ENCAPSULATION
class Program
{
static void Main(string[] args)
{
BookDb books = new BookDb();
AddBooks(books);
Console.WriteLine("Soft cover book titles:");
books.SearchSoftCoverBooks(PrintTitle);
Total sum = new Total();
books.SearchSoftCoverBooks(sum.CalculateTotalPrice);
Console.WriteLine("Cumulative total price: {0}", sum.total.ToString());
Console.ReadKey();
}
static void PrintTitle(Book book)
{
Console.WriteLine(" > {0}", book.title);
}
static void AddBooks(BookDb db)
{
db.AddBook("C programming", "Brian W.", 19.95m, true);
db.AddBook("Unix 2.0", "William G.", 25.50m, true);
db.AddBook("MS-DOS", "Smith E.", 12.75m, false);
db.AddBook("Cleam code", "Nicholson A.", 22.50m, true);
}
}
public class BookDb
{
ArrayList db = new ArrayList();
public void AddBook(string title, string owner, decimal price, bool softCover)
{
db.Add(new Book(title, owner, price, softCover));
}
public void SearchSoftCoverBooks(SearchBooks searchBooks)
{
foreach(Book b in db)
{
if(b.softCover)
{
searchBooks(b);
}
}
}
}
public class Total
{
public decimal total;
public void CalculateTotalPrice(Book book)
{
total += book.price;
}
}
public delegate void SearchBooks(Book book);
public class Book
{
public string title;
public string owner;
public decimal price;
public bool softCover;
public Book(string title, string owner, decimal price, bool softCover)
{
this.title = title;
this.owner = owner;
this.price = price;
this.softCover = softCover;
}
}
