True, but: Microsoft haven't made a better UI framework that's portable to Windows yet. Everything after WPF has near zero adoption, including (critically important!) by Microsoft itself.
reply>WinForms is a layer built on top of raw Win32. So it's not portable.
replyNeither are SwiftUI and AppKity.
Mono used to have libwine embedded. You know, libwine exists as a library running and compiling Win32 natively under Unix. Instead of PE binaries you would run ELF Linux ones, but with nearly the same outcome.
replyEvery time I tried following alone with the winelib/winemaker documentation, I always ended up with an ELF that had to be invoked using "wine" to run. Nothing that could self-load any of the wine dependencies.
replyMono supported WinForms. But IDK how did they integrate it with the CIL.
replyBut for sure they used WineLib.