namespace ReflectionFactory{    /// <summary>    /// 屋子產(chǎn)品的零件    /// </summary>    public enum RoomParts    {        Roof,        Window,        Pillar    }}

using System;namespace ReflectionFactory{    /// <summary>    /// 這個(gè)特性用來附加在產(chǎn)品類型之上，    /// 來標(biāo)注該類型代表哪個(gè)產(chǎn)品，方便反射使用    /// </summary>    public class ProductAttribute : Attribute    {        /// <summary>        /// 標(biāo)注零件的成員        /// </summary>        private RoomParts _myRoomPart;        public ProductAttribute(RoomParts part)        {            _myRoomPart = part;        }        public RoomParts RoomPart        {            get            {                return _myRoomPart;            }        }    }}

using System;namespace ReflectionFactory{    /// <summary>    /// 這個(gè)特性用來附加在產(chǎn)品接口之上    /// 用來標(biāo)注一共實(shí)現(xiàn)了多少產(chǎn)品零件，方便反射使用    /// </summary>    public class ProductListAttribute : Attribute    {        /// <summary>        /// 產(chǎn)品類型集合        /// </summary>        private Type[] _myList;        public ProductListAttribute(Type[] products)        {            _myList = products;        }        public Type[] ProductList        {            get            {                return _myList;            }        }    }}

using System;namespace ReflectionFactory{    /// <summary>    /// 產(chǎn)品零件接口，    /// 需要添加所有實(shí)現(xiàn)該接口的列表    /// </summary>    [ProductList(new Type[] { typeof(Roof), typeof(Window), typeof(Pillar) })]    public interface IProduct    {        string GetName();    }}

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

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

namespace ReflectionFactory{    /// <summary>    /// 柱子類型    /// </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>    /// 工廠類型    /// </summary>    public class Factory : IFactory    {        public IProduct Produce(RoomParts part)        {            // 通過反射，從IProduct接口獲得屬性            // 從而獲得所有的產(chǎn)品零件列表            ProductListAttribute attr = Attribute.GetCustomAttribute(typeof(IProduct),                 typeof(ProductListAttribute)) as ProductListAttribute;            // 遍歷所有的實(shí)現(xiàn)產(chǎn)品零件類型            foreach (Type type in attr.ProductList)            {                // 利用發(fā)射查找其屬性                ProductAttribute pa = Attribute.GetCustomAttribute(type,                     typeof(ProductAttribute)) as ProductAttribute;                // 確定是否是需要的零件                if (pa.RoomPart == part)                {                    // 利用反射創(chuàng)建產(chǎn)品零件類型                    Object product = Assembly.GetExecutingAssembly().CreateInstance(type.FullName);                    return product as IProduct;                }            }                        return null;        }    }}

using System;namespace ReflectionFactory{    /// <summary>    /// 工廠管理類型    /// </summary>    public class FactoryManager    {        public static IProduct GetProduct(RoomParts part)        {            // 一共只有一個(gè)工廠，不再需要根據(jù)產(chǎn)品類型而挑選工廠            Factory factory = new Factory();            IProduct product = factory.Produce(part);            Console.WriteLine("生產(chǎn)了一個(gè)產(chǎn)品：" + product.GetName());            return product;        }    }}

using System;namespace ReflectionFactory{    class Program    {        static void Main(string[] args)        {            // output : 生產(chǎn)了一個(gè)產(chǎn)品：柱子            IProduct pillar = FactoryManager.GetProduct(RoomParts.Pillar);            // output : 生產(chǎn)了一個(gè)產(chǎn)品：屋頂            IProduct roof = FactoryManager.GetProduct(RoomParts.Roof);            // output : 生產(chǎn)了一個(gè)產(chǎn)品：窗戶            IProduct window = FactoryManager.GetProduct(RoomParts.Window);            Console.Read();        }    }}