Builder Pattern

// "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：

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <appSettings>
    <add key="Builder" value="BusBuilder"/>
  </appSettings>
</configuration>