如何编写一个转换器类?如何有效地编写映射规则?

I have a quite big class A with lots of members, and i have a quite big class B that can be built when having an A object. An A object can be built when having a B object. I need both of them, as A is a kind of ViewModel, which has validation and B is a graphical description, which can be plotted easily.I have a quite big class A with lots of members