2.实现依赖倒置原则-------工厂模式

项目结构如下:

  

SimpleFactory类:

namespace Factory
{
    public class SimpleFactory
    {
        private static string IPeoPleAssambly = ConfigurationManager.AppSettings["IPeoPleAssambly"];
        private static string IMobileAssambly = ConfigurationManager.AppSettings["IMobileAssambly"];
        //配置文件+映射 ----> 创建对象
        public static IPeoPle CreateIPeoPle()
        { 
            //加载指定的托管程序集(类库)到当前应用程序域中
            Assembly assembly = Assembly.Load(IPeoPleAssambly.Split(',')[1]);
            //获取程序集中具有指定名称的Tyle对象
            Type type = assembly.GetType(IPeoPleAssambly.Split(',')[0]);
            //创建对象,并返回
            return (IPeoPle)Activator.CreateInstance(type);
        }

        //配置文件+映射 ----> 创建对象
        public static IMobile CreateIMobile()
        {
            //加载托管程序集到当前应用程序域中
            Assembly assembly = Assembly.Load(IMobileAssambly.Split(',')[1]);
            //获取程序集中具有指定名称的Tyle对象
            Type type = assembly.GetType(IMobileAssambly.Split(',')[0]);
            //创建对象,并返回
            return (IMobile)Activator.CreateInstance(type);
        }
    }
}
View Code

 

IPeoPle接口:

namespace PeoPle
{
    public interface IPeoPle
    {
        void Play(IMobile mobile);
    }
}

 

 

Student类:

namespace PeoPle
{
    public interface IPeoPle
    {
        void Play(IMobile mobile);
    }
}

 

 

IMobile接口:

namespace Mobile
{
    public interface IMobile
    {
        void Play();
    }
}

 

 

IPhone类:

namespace Mobile
{
    class IPhone : IMobile
    {
        public void Play()
        {
            Console.WriteLine("我在玩IPhone");
        }
    }
}

 

 

VIVO类

namespace Mobile
{
    class IPhone : IMobile
    {
        public void Play()
        {
            Console.WriteLine("我在玩IPhone");
        }
    }
}

 

 

配置文件:

<appSettings>
    <add key="IPeoPleAssambly" value="PeoPle.Student,PeoPle" />
    <add key="IMobileAssambly" value="Mobile.IPhone,Mobile" />
  </appSettings>

 

 

目前我们的需求是:

  依赖倒置原则:面向抽象,而不是面向细节

 

难题:既不想依赖细节,又想创建对象怎么办?

 

解决:把创建对象的事交给第三方来做

 

实现如下:

  1.工厂模式(配置文件+映射---->创建对象)

namespace IOC
{
    public class Test1
    {
        public Test1()
        {
            IPeoPle people = SimpleFactory.CreateIPeoPle();
            IMobile mobile = SimpleFactory.CreateIMobile();
            people.Play(mobile);
        }
    }
}

 

     输出:我在玩iphone

    1)现在突然我不想玩iphone了,我想玩vivo,那么我们只需要改配置文件就可以了

      配置文件修改如下(把key 为   IMobileAssambly   更改为   Mobile.VIVO,Mobile):

 <appSettings>
    <add key="IPeoPleAssambly" value="PeoPle.Student,PeoPle" />
    <add key="IMobileAssambly" value="Mobile.VIVO,Mobile" />
  </appSettings>

 

    输出:我在玩VIVO

 

  2.IOC控制反转

 

posted @ 2019-03-25 20:38  江小白鞋  阅读(387)  评论(0编辑  收藏  举报