建造者模式

建造者模式:是在当创建复杂对象的算法,应该独立于改对象的组成部分以及它们的装配方式的使用模式,好处是使得建造者代码与表示代码分离。

结构图:

 

 

 需要建造的对象(一般是复杂对象):

 

    class Product
    {
        IList<string> parts = new List<string>();
        public void Add(string part)
        {
            parts.Add(part);
        }
        public void Show()
        {
            Console.WriteLine("产品创建");
            foreach (string part in parts)
            {
                Console.WriteLine(part);
            }
        }
    }

 

 建造者的抽象类:

 

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

 

具体的建造方式在子类实现:

 

    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;
        }
    }

 

 

    class ConcreteBuilder2 : 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;
        }
    }

 

但是上也只是实现了建造的方法,需要一个建造发起者(指挥官):

 

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

 

主函数调用:

 

    class Program
    {
        static void Main(string[] args)
        {
            Director de = new Director();
            Builder b1 = new ConcreteBuilder1();
            Builder b2 = new ConcreteBuilder2();
            de.Construct(b1);
            Product p1 = b1.GetResult();
            p1.Show();
            de.Construct(b2);
            Product p2 = b2.GetResult();
            p2.Show();

            Console.ReadKey();
        }
    }

 

 

 

 

 

posted @ 2012-07-27 16:02  八神吻你  阅读(257)  评论(0编辑  收藏  举报