建造者模式（Builder）

建造者模式：将一个复杂对象的构建与他的表示分离，使得同样的构建过程可以创建不同的表示。

Builder   Director

Builder是什么？是为Product创建一个对象的各个部件指定的抽象接口，

ContreteBuilder:是具体建造者，实现Builder接口，构造和装配各个部件。Product就是具体的对象。

Director是指挥者，构建一个使用builder接口的对象。用于构建一些复杂的对象，这些对象内部构建间的构造顺序通常是稳定的，但对象的构造通常面临着复杂的变化。

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace DesignPatterns.BuilderPattern.Structural
{
    public class Product
    {
        private List<string> _parts = new List<string>();

        public void Add(string part)
        {
            _parts.Add(part);
        }

        public void Show()
        {
            Console.WriteLine("Product Parts");
            foreach (string part in _parts)
            {
                Console.WriteLine(part);
            }
        }
    }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace DesignPatterns.BuilderPattern.Structural
{
    public abstract class Builder
    {
        public abstract void BuildPartA();
        public abstract void BuildPartB();
        public abstract Product GetResult();
    }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace DesignPatterns.BuilderPattern.Structural
{
    public class ConcreteBuilder1 : Builder
    {
        private Product _product = new Product();

        public override void BuildPartA()
        {
            _product.Add("PartA");
        }

        public override void BuildPartB()
        {
            _product.Add("PartB");
        }

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

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace DesignPatterns.BuilderPattern.Structural
{
    public class ConcreteBuilder2 : Builder
    {
        private Product _product = new Product();

        public override void BuildPartA()
        {
            _product.Add("PartX");
        }

        public override void BuildPartB()
        {
            _product.Add("PartY");
        }

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

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace DesignPatterns.BuilderPattern.Structural
{
    public class Director
    {
        /// <summary>
        /// Builder uses a complex series of steps
        /// </summary>
        public void Construct(Builder builder)
        {
            builder.BuildPartA();
            builder.BuildPartB();
        }
    }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

using DesignPatterns.BuilderPattern.Structural;

namespace DesignPatterns.BuilderPattern
{
    class Program
    {
        static void Main(string[] args)
        {
            // Create director and builders
            Director director = new Director();

            Builder b1 = new ConcreteBuilder1();
            Builder b2 = new ConcreteBuilder2();
            
            // Construct two products
            director.Construct(b1);
            Product p1 = b1.GetResult();
            p1.Show();

            director.Construct(b2);
            Product p2 = b2.GetResult();
            p2.Show();
        }
    }
}

建造者模式（Builder） http://www.cnblogs.com/libingql/p/3633527.html