// "Handler"using System;using System.Collections.Generic;using System.Text;using System.Reflection;using System.Collections;namespace ConsoleApplication3{    abstract public class Builder    {         abstract public void BuilderWheel();        abstract public void BuilderEngine();        abstract public Product GetProduct();    }    public class Product    {        Hashtable aHash = new Hashtable();        public Product()        {            aHash.Clear();        }        public void add(string name,string value)        {            //if(!aHash.Contains(name))            aHash.Add(name, value);        }        public void show()        {            IDictionaryEnumerator myEnumerator  = aHash.GetEnumerator();            while (myEnumerator.MoveNext())            {                Console.WriteLine(myEnumerator.Value.ToString());            }        }    }    public class CarBuilder : Builder    {        Product iProduct = new Product();        public CarBuilder() {}        public override void BuilderEngine()        {            iProduct.add("Engine", "CarEngine");        }        public override void BuilderWheel()        {            iProduct.add("Wheel", "CarWheel");        }        public override Product GetProduct()        {            return iProduct;        }    }    public class BusBuilder : Builder    {        Product iProduct = new Product();        public BusBuilder() { }        public override void BuilderEngine()        {            iProduct.add("Engine", "BusEngine");        }        public override void BuilderWheel()        {            iProduct.add("Wheel", "BusWheel");        }        public override Product GetProduct()        {            return iProduct;        }    }    public class Direct    {        public void Construct(Builder aBuilder)        {            aBuilder.BuilderEngine();            aBuilder.BuilderWheel();        }    }    class Program    {    public static void Main(string[] args)    {        string factoryName = System.Configuration.ConfigurationSettings.AppSettings["Builder"];        Builder aBuilder = (Builder)Assembly.GetExecutingAssembly().CreateInstance("ConsoleApplication3."+factoryName);        Direct aDirect = new Direct();        aDirect.Construct(aBuilder);        Product aProduct = aBuilder.GetProduct();        aProduct.show();        Console.ReadKey();    }    }}

 

 

App.config配置：