c# 设计模式 之：抽象工厂

1、作用：抽象工厂的目的就是生产【产品族】，之前讲的“工厂模式”的每一个factory只造一种产品，抽象工厂让一个factory造多个产品。

uml类图：

 代码实现：

抽象工厂代码：

namespace CNBlogs.DesignPattern.Common
{
    /// <summary>
    /// 抽象工厂类
    /// </summary>
    public abstract class AbstractEquipment
    {
        /// <summary>
        /// 抽象方法： 创建一辆车
        /// </summary>
        /// <returns></returns>
        public abstract AbstractCar CreateCar();

        /// <summary>
        /// 抽象方法： 创建背包
        /// </summary>
        /// <returns></returns>
        public abstract AbstractBackpack CreateBackpack();
    }
}

抽象产品代码：

namespace CNBlogs.DesignPattern.Common
{
    /// <summary>
    /// 抽象产品: 车抽象类
    /// </summary>
    public abstract class AbstractCar
    {
        /// <summary>
        /// 车的类型属性
        /// </summary>
        public abstract string Type
        {
            get;
        }

        /// <summary>
        /// 车的颜色属性
        /// </summary>
        public abstract string Color
        {
            get;
        }
    }

    /// <summary>
    /// 抽象产品: 背包抽象类
    /// </summary>
    public abstract class AbstractBackpack
    {
        /// <summary>
        /// 包的类型属性
        /// </summary>
        public abstract string Type
        {
            get;
        }

        /// <summary>
        /// 包的颜色属性
        /// </summary>
        public abstract string Color
        {
            get;
        }
    }
}

具体工厂代码：

namespace CNBlogs.DesignPattern.Common
{
    /// <summary>
    /// 运动装备
    /// </summary>
    public class SportEquipment : AbstractEquipment
    {
        public override AbstractCar CreateCar()
        {
            return new SportCar();
        }

        public override AbstractBackpack CreateBackpack()
        {
            return new SportBackpack();
        }
    }

    /// <summary>
    /// 越野装备  这里就不添加了，同运动装备一个原理，demo里只演示一个，实际项目中可以按需添加
    /// </summary>
    //public class JeepEquipment : AbstractEquipment
    //{
    //    public override AbstractCar CreateCar()
    //    {
    //        return new JeeptCar();
    //    }

    //    public override AbstractBackpack CreateBackpack()
    //    {
    //        return new JeepBackpack();
    //    }
    //}
}

具体产品代码：

namespace CNBlogs.DesignPattern.Common
{
    /// <summary>
    /// 跑车
    /// </summary>
    public class SportCar : AbstractCar
    {
        private string type = "Sport";
        private string color = "Red";

        /// <summary>
        /// 重写基类的Type属性
        /// </summary>
        public override string Type
        {
            get
            {
                return type;
            }
        }

        /// <summary>
        /// 重写基类的Color属性
        /// </summary>
        public override string Color
        {
            get
            {
                return color;
            }
        }
    }

    /// <summary>
    /// 运动背包
    /// </summary>
    public class SportBackpack : AbstractBackpack
    {
        private string type = "Sport";
        private string color = "Red";

        /// <summary>
        /// 重写基类的Type属性
        /// </summary>
        public override string Type
        {
            get
            {
                return type;
            }
        }

        /// <summary>
        /// 重写基类的Color属性
        /// </summary>
        public override string Color
        {
            get
            {
                return color;
            }
        }
    }
}
//具体产品可以有很多很多， 至于越野类的具体产品这里就不列出来了。

创建装备代码：

namespace CNBlogs.DesignPattern.Common
{
    public class CreateEquipment
    {
        private AbstractCar fanCar;
        private AbstractBackpack fanBackpack;
        public CreateEquipment(AbstractEquipment equipment)
        {
            fanCar = equipment.CreateCar();
            fanBackpack = equipment.CreateBackpack();
        }

        public void ReadyEquipment()
        {
            Console.WriteLine(string.Format("老范背着{0}色{1}包开着{2}色{3}车。", 
                fanBackpack.Color, 
                fanBackpack.Type,
                fanCar.Color,
                fanCar.Type
                ));
        }
    }
}

客户端代码：

//------------------------------------------------------------------------------
// <copyright file="Program.cs" company="CNBlogs Corporation">
//     Copyright (C) 2015-2016 All Rights Reserved
//     原博文地址： http://www.cnblogs.com/toutou/
//     作      者: 请叫我头头哥
// </copyright> 
//------------------------------------------------------------------------------
namespace CNBlogs.DesignPattern
{
    using System;
    using System.Configuration;
    using System.Reflection;

    using CNBlogs.DesignPattern.Common;

    class Program
    {
        static void Main(string[] args)
        {
            // ***具体app.config配置如下*** //
            //<add key="assemblyName" value="CNBlogs.DesignPattern.Common"/>
            //<add key="nameSpaceName" value="CNBlogs.DesignPattern.Common"/>
            //<add key="typename" value="SportEquipment"/>
            // 创建一个工厂类的实例
            string assemblyName = ConfigurationManager.AppSettings["assemblyName"];
            string fullTypeName = string.Concat(ConfigurationManager.AppSettings["nameSpaceName"], ".", ConfigurationManager.AppSettings["typename"]);
            AbstractEquipment factory = (AbstractEquipment)Assembly.Load(assemblyName).CreateInstance(fullTypeName);
            CreateEquipment equipment = new CreateEquipment(factory);
            equipment.ReadyEquipment();
            Console.Read();
        }
    }
}