抽象工厂

  提供一个创建一系列相关或相互依赖对象的接口，而无需指定它们具体的类

对于不同类产品提供一类工厂

1.产品接口

interface IBag {
   string Material { get; }
 }
 
 // Product 2
 interface IShoes {
   int Price { get; }
 }

2.工厂

这里采用了泛型，所以会更灵活些

interface IFactory<Brand>
   where Brand : IBrand {
   IBag CreateBag();
   IShoes CreateShoes();
 }
 
 // Conctete Factories (both in the same one)
 class Factory<Brand> : IFactory<Brand>
   where Brand : IBrand, new() {
   public IBag CreateBag() {
     return new Bag<Brand>();
   }
 
   public IShoes CreateShoes() {
     return new Shoes<Brand>();
   }
 }

3.IBrand

不同类产品信息

interface IBrand {
   int Price { get; }
   string Material { get; }
 }
 
 class Gucci : IBrand {
   public int Price { get { return 1000; } }
   public string Material { get { return "Crocodile skin"; } }
 }
 
 class Poochy : IBrand {
   public int Price { get { return new Gucci().Price / 3; } }
   public string Material { get { return "Plastic"; } }
 }
 
 class Groundcover : IBrand {
   public int Price { get { return 2000; } }
   public string Material { get { return "South african leather"; } }
 }

4.对不同类产品创建不同工厂

class Client<Brand>
     where Brand : IBrand, new() {
     public void ClientMain() { //IFactory<Brand> factory)
       IFactory<Brand> factory = new Factory<Brand>();
 
       IBag bag = factory.CreateBag();
       IShoes shoes = factory.CreateShoes();
 
       Console.WriteLine("I bought a Bag which is made from " + bag.Material);
       Console.WriteLine("I bought some shoes which cost " + shoes.Price);
       Console.ReadKey();
     }
   }
 
   static class Program {
     static void Main() {
       // Call Client twice
       new Client<Poochy>().ClientMain();
       new Client<Gucci>().ClientMain();
       new Client<Groundcover>().ClientMain();
     }
   }

此模式应该来说非常重要，应用也比较广泛.结合反射功能效果会更好.

转载于:https://www.cnblogs.com/Clingingboy/archive/2010/08/26/1809556.html