I am developing framework libraries WebRTCme - Medium to support developing WebRTC applications for Blazor and Xamarin Forms platforms with a single unified API.
Originally, it was providing only peer to peer mesh topology configuration. Lately I ported MediaSoup server and client code to .NET/C# and integrated them into the framework so that it will support SFU - Media Server configuration as well,
It is at Beta level and there are still things to improve but it is a promising start. You can check the source code and more detailed description in the link given above.
Thanks,
Melih