C#简单工厂案例

using system;
namespace application
{
    class jiandangongchang
    {
        static void main(string[] args)
        {
            factory factory=new factory();
            diannao diannao=factory.create("lx");
            diannao.print();
        }
    }
    
    public abstract class diannao
    {
        public abstract void print();
    }
    
    public class lianxiang:diannao
    {
        public override void print()
        {
            console.writeline("联想电脑");
        }
    }
    
    public class daier:diannao
    {
        public override void print()
        {
            console.writeline("戴尔电脑");
        }
    }
    //创建一个工厂类
    public class factory
    {
        private diannao diannao;
        //创建一个工厂方法
        public diannao create(string diannao){
            switch(diannao)
            {
                case "lx":diannao=new lianxiang();
                break;
                case "de":diannao=new daier();
                break;
                default:
                break;
            }
            return diannao;
        }
    }
    
}