工厂方法 FactoryMethod

abstract class FactoryParttern
{
    public abstract ICommodity MakeCommodity(Commodity commodity);
    public ICommodity Make(Commodity commodity)
    {
        return MakeCommodity(commodity);
    }
}

工厂方法抽象

using System;

class ChinaFactory : FactoryParttern
{
    public override ICommodity MakeCommodity(Commodity commodity)
    {
        switch (commodity)
        {
            case Commodity.Cap:
                return new Cap();
                break;
            case Commodity.Shoes:
                return new Shoes();
                break;
            case Commodity.Sock:
                return new Sock();
                break;
            case Commodity.Trousers:
                return new Trousers();
                break;
            default:
                throw new Exception("参数无效");
        }
    }
}

工厂方法抽象实现A

interface ICommodity
{
    void Print();
}

产品接口

using System;

class Cap : ICommodity
{
    public Cap() { }
    public void Print() {
        Console.WriteLine("Im a Cap!");
    }
}

产品实现A

using System;

class Shoes:ICommodity
{
    public Shoes() { }
    public void Print() {
        Console.WriteLine("Im a Shoes!");
    }
}

产品实现B

using System;

class Sock : ICommodity
{
    public Sock() { }
    public void Print() {
        Console.WriteLine("Im a Sock!");
    }
}

产品实现C

using System;

class Trousers : ICommodity
{
    public Trousers() { }
    public void Print() {
        Console.WriteLine("Im Trousers!");
    }
}

产品实现D

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

namespace FactoryPattern
{
    class Program
    {
        static void Main(string[] args)
        {
            ICommodity commodity;
                     
       
            ChinaFactory cf = new ChinaFactory();
            commodity = cf.Make(Commodity.Sock);

      

            commodity.Print();
            Console.ReadKey();
        }
    }
}

调用者