I'm trying to figure out how to detect when the current user has changed their workspace in Mono. I'm not even really sure how the workspace aspect of Gnome operates. A brief look through Monodoc didn't turn anything up, and I couldn't locate a GConf key that gave me what I wanted either.
Update: The method below will ONLY work if Compiz is not set to have a virtual size. For instance, if you set the number of desktops in Compiz to 1 with a horizontal virtual size of 2, Gdk.Global.CurrentDesktop will return 0 for both workspaces.
So does anyone know of a method for finding if the workspace has been changed when Compiz has virtual desktops enabled?
This is actually a feature of the window manager, and how exactly it works varies between window managers. I'm not familiar with how to access xlib in Mono, but you're looking for the _NET_NUMBER_OF_DESKTOPS, _NET_DESKTOP_NAMES, _NET_CURRENT_DESKTOP, etc. X properties on the root window.
FreeDesktop.org's Extended Window Manager Hints specification contains many of the details.