static void Main(string[] args)
{
IFactory factory = new FactoryA();//需要产品B时更改类型即可**********推送修改
//IFactory factory = new FactoryA();
Product pA = factory.CreateProduct();
pA.Function();
Console.ReadLine();
}
static void Main(string[] args)
{
Factory factoryA = new FactoryA();
Product productA = factoryA.CreateProduct();
productA.Operation();
Factory factoryB = new FactoryB();
Product productB = factoryB.CreateProduct();
productB.Operation();
}