它被称为工厂方法和（正如 Bruno Sprecher 正确指出的）通常以共享方法实现。然而，这个代码项目文章显示了工厂可以实现的许多不同方式：实施工厂的不同方式 [ ^ ]。

It is called factory method and (as correctly pointed out by Bruno Sprecher) is usually implemented as Shared method. This Code Project article however show many different ways a factory could be implemented: "Different ways of implementing factories"[^].