通过查看反射的代码，在构造DbContext（基类）时，它会调用DbSetDiscoveryService（内部clasS）-本质上，它使用反射来查找DbContext上的所有属性。

From looking at the reflected code, when the DbContext (the base class) is constructed it makes a call to the DbSetDiscoveryService (an internal clasS) - which essentially uses reflection to find all properties on the DbContext, and then initializes those that need initializing.

简而言之-在构造函数中使用反射。

So in short - using reflection in the constructor.