Is there a way to use Fody in Unity3d ?
https://github.com/Fody/PropertyChanged

In the most tutorials, that im going through, i often get introduced to Fody, to reduce boilderplate code.
But the Viewmodel is compiled in Unity, not Visual Studio.

The only ones that i found, seem realy outdated and not good explained.
https://github.com/jbruening/UnityFody
https://github.com/benblo/Unity.Fody

We didn't use that library, but if it is designed for .NET 4.0+ maybe you can try Unity's Experimental .NET 4.6 to test it.