问题
I have 2 computers running VS 2012 pro, and neither of them are showing any of the highlighting or coloring for the XML based files like I had for VS2010.
The only express edition tool I have installed is SQL 2012, so I don't believe that is the problem.
WebMatrix 1 and 2 have never been installed on one of the computers.
I am pretty much at a loss here.
回答1:
Fixed. I had to reset the environment more than once. Each time resulted in another part of VS breaking when I launched it. Eventually, I had reset it enough times that it is all working now.
Used "devenv /resetuserdata" to reset VS for the fix.
来源：https://stackoverflow.com/questions/14370477/vs-2012-syntax-highlighting