生成器模式(Builder Parttern)

一、介绍

　　生成器模式有点像是抽象工厂模式，两者都返回由一些方法和对象组成的类，主要的区别在于，抽象工厂返回系列相关类，生成器则根据向其提交的数据来逐步构造出复杂的对象。

二、UML图

　　

三、示例

//动物

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

namespace Builder
{
    /// <summary>
    /// 抽象类
    /// </summary>
   public abstract class AbstractAnimal
    {
       public abstract string GetName();
    }
    /// <summary>
    /// 狗类
    /// </summary>
   public class Dog : AbstractAnimal
   {
       public override string GetName()
       {
           return "Dog";
       }
   }
    /// <summary>
    /// 猫
    /// </summary>
   public class Cat : AbstractAnimal
   {
       public override string GetName()
       {
           return "Cat";
       }
   }
}

//行为

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

namespace Builder
{
   public interface IAction
    {
        string Eat();
        string sound();
    }
    /// <summary>
    /// 狗行为
    /// </summary>
     public class DogAction : IAction
     {
         private AbstractAnimal _animal;
         public DogAction(AbstractAnimal A)
         { _animal = A; }
         #region IAction 成员

         public string Eat()
         {
             return _animal.GetName()+"啃骨头";
         }

         public string sound()
         {
             return _animal.GetName()+"汪汪叫";
         }

         #endregion
     }
    /// <summary>
    /// 猫行为
    /// </summary>
     public class CatAction : IAction
     {
         private AbstractAnimal _animal;
         public CatAction(AbstractAnimal A)
         { _animal = A; }
         #region IAction 成员

         public string Eat()
         {
             return _animal.GetName()+"吃鱼";
         }

         public string sound()
         {
             return _animal.GetName()+"喵喵叫";
         }

         #endregion
     }
}

//生成器

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

namespace Builder
{
    /// <summary>
    /// 抽象Builder
    /// </summary>
    public abstract class AbstractActionBuilder
    {
        public abstract IAction GetBuilder(AbstractAnimal A);
    }
    /// <summary>
    /// 狗Builder
    /// </summary>
    public class DogActionBuilder : AbstractActionBuilder
    {
        public override IAction GetBuilder(AbstractAnimal A)
        {
            return new DogAction(A);
        }
    }
    /// <summary>
    /// 猫Builder
    /// </summary>
    public class CatActionBuilder : AbstractActionBuilder
    {
        public override IAction GetBuilder(AbstractAnimal A)
        {
            return new CatAction(A);
        }
    }
}

//Program

class Program
    {
        static void Main(string[] args)
        {
            AbstractActionBuilder builder = new DogActionBuilder();
            IAction action = builder.GetBuilder(new Dog());
            Console.WriteLine(action.Eat());
            Console.WriteLine(action.sound());


            Console.WriteLine("---------------");



            builder=new CatActionBuilder();
            action=builder.GetBuilder(new Cat());
            Console.WriteLine(action.Eat());
            Console.WriteLine(action.sound());


            Console.Read();
        }
    }

//运行结果