Hi. I built this Trezor C# library:

https://github.com/MelbourneDeveloper/Trezor.Net

It's fully open source (MIT License). It's being used in two production versions of the same app Hardfolio which is in the Google Play Store and the Windows 10 Store. I'm happy to support the library so if you have any issues, please log in them in the issues section on GitHub. There's currently only a sample for .NET Core, but I am using it's out in the wild on Android and UWP.

You can get it from NuGet. It's Trezor.Net