since I'm trying to get gstreamer-sharp 0.99 to run with my application, I heard, that gtk-3 is needed for gstreamer.
gstreamer-sharp 0.99 doesn't depend on gtk-sharp 3, it depends on glib-sharp 3, which, as of today, is hosted in the same repo as gtk-sharp 3, but that will change soonish.
Has anybody tried to build gtk-sharp 3.0 for monodevelop?
MonoDevelop only works with gtk+ 2.x versions. If you install gtk-sharp 3, you will not break or override gtk-sharp 2.x, as they can be installed in parallel.
I'm running fedora and tried, but all I could do, is link the dll manually to my project and the application didn't start.
Tried...? And what...? What happened? I'm assuming you failed? How did you fail, what error did you get?
Is gtk-sharp still beta?
gtk# 3 yes, gtk# 2.x is very mature though.