IL2CPP stripping UWP C# code

Hi. I am trying to port this code:
https://github.com/microsoft/Unity-Xaml-Sample
which is compatible with unity 2017, to unity 2019 wit IL2CPP support. The problem is that there are some methods and internal classes of the MainPage.xaml.cs that get stripped out in the C++ generated code. I am not sure if this is an issue of the C++ generation or the stripping itself. I've marked on top of the file with the attrubte [assembly: Preserve], but even with that it does not work.

Of course, when trying to compile, it fails.

Hope anybody can hint me to a solution. Thanks in advance.

David.

 

Well, it seems that IL2CPP was not stripping anything, but creating its own App.xaml and App.xaml.cpp and .h as well as the same for MainPage. So in order more or less to make it work I had to create a partial MainPage class for add the extra methods. The thing is that I have to add manually those files in the visual studio project, and also I have to modify the generated MainPage.xaml.cpp to include the MainPage.extra.xaml.h where I define the extra methods.

Is there a way to tell Unity in the build process that it should tweak the code or the project generated some way instead of modify it every time the project is built?

Thanks.

 

Thank you very much. I've followed many of your answers to different users about interoperation between wpf side and unity side and they have been really useful. Hope I can read more from you.