public class Product
    {
        IList<string> parts = new List<string>();
        public void Add(string str)
        {
            parts.Add(str);
        }

        public void Show()
        {
            Console.WriteLine("\n产品创建-----");
            foreach (string item in parts)
            {
                Console.WriteLine(item);
            }
        }
    }

    public abstract class Builder
    {
        public abstract void BuilderPartA();
        public abstract void BuilderPartB();
        public abstract Product GetResult();
    }

    class ConcreteBuilder1 : Builder
    {
        private Product product = new Product();

        public override void BuilderPartA()
        {
            product.Add("部件A");
        }

        public override void BuilderPartB()
        {
            product.Add("部件B");
        }

        public override Product GetResult()
        {
            return product;
        }
    }


    public class ConcerteBulider2 : Builder
    {
        private Product product = new Product();

        public override void BuilderPartA()
        {
            product.Add("部件X");
        }

        public override void BuilderPartB()
        {
            product.Add("部件Y");
        }

        public override Product GetResult()
        {
            return product;
        }
    }

    public class Director
    {
        public void Construct(Builder builder)
        {
            builder.BuilderPartA();
            builder.BuilderPartB();
        }
    }

 static void Main(string[] args)
        {
            Director director = new Director();
            Builder b1 = new ConcreteBuilder1();
            Builder b2 = new ConcerteBulider2();
            director.Construct(b1);
            Product p1 = b1.GetResult();
            p1.Show();
            director.Construct(b2);
            Product p2 = b2.GetResult();
            p2.Show();
        }