StravaSharp makes Strava V3 API consumable in .NET projects.
Portability is essential by design. You can use this library on any platform that supports .NET Standard 1.1 (.NET Framework 4.5, Windows 8, Windows Phone 8.1, UWP, Xamarin.iOS, Xamarin.Android, etc.)
Here you can find some info about how to start integrating StravaSharp into your environment.