建造者模式示例代码

    public abstract class Builder
    {
        public abstract void showtitle();
        public abstract void showbody();
    }

    public class Director
    {
        public void show(Builder b)
        {
            b.showtitle();
            b.showbody();
        }
    }

    public class PageA : Builder
    {
        public override void showtitle()
        {
            Console.WriteLine("PageA : title");
        }

        public override void showbody()
        {
            Console.WriteLine("PageA : body");
        }
    }

    public class PageB : Builder
    {
        public override void showtitle()
        {
            Console.WriteLine("PageB : title");
        }

        public override void showbody()
        {
            Console.WriteLine("PageB : body");
        }
    }

 调用：

                {
                    PageA a = new PageA();
                    PageB b = new PageB();

                    Director d = new Director();
                    d.show(a);
                    d.show(b);
                }