一个用C#写的汽车销售系统，完全运用三层工厂模式，代码编写规范-Use C# to write a car sales system, we rely solely on the three-tier plant model, coding standards

C#简单工厂模式的实质是由一个工厂类根据传入的参数，动态决定应该创建哪一个产品类的实例，这是一个简单工厂搭建的实例-C# simple factory pattern is essentially a factory by the parameters of the incoming class, which dynamically decide to create a product class instance, which is a simple instance of the facto