C#深度学习の接口传参（interface）-----接口的妙用

一、接口可以干嘛

       我们知道，接口的本质是一个约束规范，委托是方法纵向（形式上）的封装，接口是不同方法横向（广度）的封装

接口中不能有变量，但是可以有属性方法。常见的，我们可以用接口：

1、实现需求方的方法

2、接口作为参数，实现对不同类的解耦，下面是常见的男女类

    public interface ISay
    {
        void Say();
    }

    public class Man:ISay
    {
        public void Say()
        {
            Console.WriteLine("你好，我是男士！");
        }
    }

    public class Woman : ISay
    {
        public void Say()
        {
            Console.WriteLine("你好，我是女士！");
        }
    }

    public class Peole
    {
        public void Say(ISay iPeople)
        {
            iPeople.Say();
        }
    }

    class Program
    {
        static void Main(string[] args)
        {
            Man man = new Man();
            Woman woman = new Woman();
            Peole peole = new Peole();
            peole.Say(man);
            peole.Say(woman);
            Console.ReadLine();
        }
    }

3、接口作返回值，返回一个实现了接口的对象，基本和上面的例子类似

二、接口可以传参（常用来做对外SDK）

下面以两种常见构型讲解

1、A工厂生产产品，B工厂代理，C工厂卖，于是我们：

    public interface ITransfer
    {
        void Transfer(string msg);
    }

    public class FactoryA
    {
        public ITransfer FacATransfer = null;

        public FactoryA()
        {
            product();
        }

        public void product()
        {
            int produceNum=0;
   
            Task.Factory.StartNew(()=> 
            {
                while (true)
                {
                    produceNum++;
                    FacATransfer?.Transfer(String.Format("来自FactoryA的第{0}个产品", produceNum));
                    Thread.Sleep(2000);
                }
            });
        }

    }

    public class FactoryB //中间商
    {
        public void ConnectInit(ITransfer transfer)
        {
            FactoryA factoryA = new FactoryA();
            factoryA.FacATransfer = transfer;
        }

    }

    public class FactoryC:ITransfer
    {
        public FactoryC()
        {
            FactoryB factoryB = new FactoryB();
            factoryB.ConnectInit(this);
        }
        public void Transfer(string msg)
        {
            Console.WriteLine("为FactoryC生产，"+msg);
        }
    }

调用

    class Program
    {
        static void Main(string[] args)
        {
            FactoryC factoryC = new FactoryC();
            //FactoryD factoryD = new FactoryD();
            Console.ReadLine();
        }
    }

2、工厂A生产，D直接代理

    public class FactoryA
    {
        public ITransfer FacATransfer = null;

        public FactoryA()
        {
            product();
        }

        public void product()
        {
            int produceNum=0;
   
            Task.Factory.StartNew(()=> 
            {
                while (true)
                {
                    produceNum++;
                    FacATransfer?.Transfer(String.Format("来自FactoryA的第{0}个产品", produceNum));
                    Thread.Sleep(2000);
                }
            });
        }

    }

调用：

    class Program
    {
        static void Main(string[] args)
        {
            //FactoryC factoryC = new FactoryC();
            FactoryD factoryD = new FactoryD();
            Console.ReadLine();
        }
    }

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