建造者模式（Builder）

/*
 * 建造者模式是一种创建型模式，它主要是应对项目中一些复杂对象的创建工作。
 * 所谓“复杂对象”，是指此对象中还含有其它的子对象。
 * 我们现在定义一个场景：汽车生产必须包含车轮(Wheel)、油箱(OilBox)和车身(Body)，
 * 应用建造者模式，用C#控制台应用程序实现该设计，构建BMW品牌和BenZ品牌汽车生产。
 */
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Builder
{
    class Car
    {
        IList<string> parts = new List<string>();
        public void Add(string part)
        {
            parts.Add(part);
        }
        public void Show()
        {
            Console.WriteLine("\n创建产品\nBegin");
            foreach (string part in parts)
            {
                Console.WriteLine("创建:"+part);
            }
            Console.WriteLine("End");
        }
    }
    abstract class Builder
    {
        public abstract void BuildWheel();
        public abstract void BuildOilBox();
        public abstract void BuildBody();
        public abstract Car GetProduct();
    }
    class BMWBuilder : Builder
    {
        private Car car = new Car();
        public override void BuildWheel()
        {
            car.Add("BMW-Wheel");
        }
        public override void BuildOilBox()
        {
            car.Add("BMW-OilBox");
        }
        public override void BuildBody()
        {
            car.Add("BMW-Body");
        }
        public override Car GetProduct()
        {
            return car;
        }

    }
    class BenZBuilder : Builder
    {
        private Car car = new Car();
        public override void BuildWheel()
        {
            car.Add("BenZ-Wheel");
        }
        public override void BuildOilBox()
        {
            car.Add("BenZ-OilBox");
        }
        public override void BuildBody()
        {
            car.Add("BenZ-Body");
        }
        public override Car GetProduct()
        {
            return car;
        }

    }
    class Director
    {
        public void Construct(Builder bd)
        {
            bd.BuildWheel();
            bd.BuildOilBox();
            bd.BuildBody();
        }
    }
    class Program
    {
        static void Main(string[] args)
        {
            Director dt = new Director();
            Builder bmw = new BMWBuilder();
            Builder benz = new BenZBuilder();

            dt.Construct(bmw);
            Car car1 = bmw.GetProduct();
            car1.Show();

            dt.Construct(benz);
            Car car2 = benz.GetProduct();
            car2.Show();
        }
    }
}