建造者模式

/// <summary>
    /// 指挥者类
    /// </summary>
    public class MealDirector
    {
        private MealBuilder _mealbuilder;

        public MealDirector(MealBuilder mealbuilder)
        {
            _mealbuilder = mealbuilder;
        }

        public Meal CreateMeal()
        {
            _mealbuilder.BuildBuger();
            _mealbuilder.BuildChips();
            _mealbuilder.buildDrink();

            return _mealbuilder.GetMeal();
        }
    }

/// <summary>
    /// 抽象建造者类
    /// </summary>
    public abstract class MealBuilder
    {
        protected Meal _meal = new Meal();

        public abstract void BuildBuger();
        public abstract void BuildChips();
        public abstract void buildDrink();

        public Meal GetMeal()
        {
            return _meal;
        }
    }

// <summary>
    /// KFC套餐 具体建造者类
    /// </summary>
    public class MealKFCBuilder:MealBuilder
    {
        public override void BuildBuger()
        {
            _meal.AddPart(new KFCBuger());
        }

        public override void BuildChips()
        {
            _meal.AddPart(new KFCChips());
        }

        public override void buildDrink()
        {
            _meal.AddPart(new KFCDrink());
        }

    }

/// <summary>
    /// 麦当劳套餐 具体创建者类
    /// </summary>
    public class MealMBuilder:MealBuilder
    {
        public override void BuildBuger()
        {
            _meal.AddPart(new MBuger());
        }

        public override void BuildChips()
        {
            _meal.AddPart(new MChips());
        }

        public override void buildDrink()
        {
            _meal.AddPart(new MDrink());
        }
    }

// <summary>
    /// 套餐产品抽象类
    /// </summary>
     public abstract class part
    {
         public abstract void Make();
    }

/// <summary>
    /// 汉堡部分
    /// </summary>
    class BugerPart
    {
    }

    public class KFCBuger : part
    {
        public override void Make()
        {
            Console.WriteLine("KFC汉堡，递到了客户面前");
        }
    }

    public class MBuger : part
    {
        public override void Make()
        {
            Console.WriteLine("麦当劳汉堡，递到了客户面前");
        }
    }

/// <summary>
    /// 薯条部分
    /// </summary>
    class ChipsPart
    {
    }

    public class KFCChips : part
    {
        public override void Make()
        {
            Console.WriteLine("KFC薯条，递到了客户面前");
        }
    }

    public class MChips : part
    {
        public override void Make()
        {
            Console.WriteLine("麦当劳薯条，递到了客户面前");
        }
    }

/// <summary>
    /// 饮料部分
    /// </summary>
    class DrinkPart
    {
    }

    public class KFCDrink : part
    {
        public override void Make()
        {
            Console.WriteLine("KFC饮料，递到了客户面前");
        }
    }

    public class MDrink : part
    {
        public override void Make()
        {
            Console.WriteLine("麦当劳饮料，递到了客户面前");
        }
    }

//客户端代码
class Client
    {
        static void Main(string[] args)
        {
            MealKFCBuilder kfcbuilder = new MealKFCBuilder();
            MealDirector kfcdirector = new MealDirector(kfcbuilder);
            kfcdirector.CreateMeal().Make();

            Console.WriteLine("kfc套餐打包完毕，用户得到kfc套餐。");
            Console.Read();
        }
    }