How to communicate across projects inside one .NET solution?

Question

I have a .NET Core (UWP solution) application which has 3 different projects (let\'s call them A, B and C).

A and B are Windows Runtime Components, and C is a simple

Answer 1

Singleton class won't work here - every process will has its own memory and so its own singleton.

AFAIK in UWP for inter process (between background tasks and main UI, apart from audio task) communication you will need some kind of a broker. For short synchronization you may think of using LocalSettings, for more complicated scenarios maybe a file/database in LocalFolder. If you decide to use a file you will need to synchronize processes, for this purpose you have objects like Mutex nad WaitHandles.