namespace ReflectionFactory
{/// <summary>/// 屋子产品的零件/// </summary>public enum RoomParts{Roof,Window,Pillar}
}

using System;namespace ReflectionFactory
{/// <summary>/// 这个特性用来附加在产品类型之上，/// 来标注该类型代表哪个产品，方便反射使用/// </summary>public class ProductAttribute : Attribute{/// <summary>/// 标注零件的成员/// </summary>private RoomParts _myRoomPart;public ProductAttribute(RoomParts part){_myRoomPart = part;}public RoomParts RoomPart{get{return _myRoomPart;}}}
}

using System;namespace ReflectionFactory
{/// <summary>/// 这个特性用来附加在产品接口之上/// 用来标注一共实现了多少产品零件，方便反射使用/// </summary>public class ProductListAttribute : Attribute{/// <summary>/// 产品类型集合/// </summary>private Type[] _myList;public ProductListAttribute(Type[] products){_myList = products;}public Type[] ProductList{get{return _myList;}}}
}

using System;namespace ReflectionFactory
{/// <summary>/// 产品零件接口，/// 需要添加所有实现该接口的列表/// </summary>[ProductList(new Type[] { typeof(Roof), typeof(Window), typeof(Pillar) })]public interface IProduct{string GetName();}
}

namespace ReflectionFactory
{/// <summary>/// 屋顶类型/// </summary>
    [Product(RoomParts.Roof)]public class Roof : IProduct{public string GetName(){return "屋顶";}}
}

namespace ReflectionFactory
{/// <summary>/// 窗户类型/// </summary>
    [Product(RoomParts.Window)]public class Window : IProduct{public string GetName(){return "窗户";}}
}

namespace ReflectionFactory
{/// <summary>/// 柱子类型/// </summary>
    [Product(RoomParts.Pillar)]public class Pillar : IProduct{public string GetName(){return "柱子";}}
}

namespace ReflectionFactory
{public interface IFactory{IProduct Produce(RoomParts part);}
}

using System;
using System.Reflection;namespace ReflectionFactory
{/// <summary>/// 工厂类型/// </summary>public class Factory : IFactory{public IProduct Produce(RoomParts part){// 通过反射，从IProduct接口获得属性// 从而获得所有的产品零件列表ProductListAttribute attr = Attribute.GetCustomAttribute(typeof(IProduct), typeof(ProductListAttribute)) as ProductListAttribute;// 遍历所有的实现产品零件类型foreach (Type type in attr.ProductList){// 利用发射查找其属性ProductAttribute pa = Attribute.GetCustomAttribute(type, typeof(ProductAttribute)) as ProductAttribute;// 确定是否是需要的零件if (pa.RoomPart == part){// 利用反射创建产品零件类型Object product = Assembly.GetExecutingAssembly().CreateInstance(type.FullName);return product as IProduct;}}return null;}}
}

using System;namespace ReflectionFactory
{/// <summary>/// 工厂管理类型/// </summary>public class FactoryManager{public static IProduct GetProduct(RoomParts part){// 一共只有一个工厂，不再需要根据产品类型而挑选工厂Factory factory = new Factory();IProduct product = factory.Produce(part);Console.WriteLine("生产了一个产品：" + product.GetName());return product;}}
}

using System;namespace ReflectionFactory
{class Program{static void Main(string[] args){// output : 生产了一个产品：柱子IProduct pillar = FactoryManager.GetProduct(RoomParts.Pillar);// output : 生产了一个产品：屋顶IProduct roof = FactoryManager.GetProduct(RoomParts.Roof);// output : 生产了一个产品：窗户IProduct window = FactoryManager.GetProduct(RoomParts.Window);Console.Read();}}
}