I'm getting a little bit crazy right now. My company switched from VS2008 to VS2012 and by now I couldn't find any option to enable code highlighting for structs.
In VS2008 something like
public Color Foreground {get;set;}
the keyword Color would be highlighted because it's a well known and defined struct.
In VS2012 the highlighting feature doesn't work for structs anymore.
Does anyone else also noticed? Has anyone a solution? I went through all the Color Options and tried everything but I can't get the good old struct highlighting color back.
It works fine for me, in VS2012:
What you're looking for is the User Types (Value types) color inTools -> Options -> Environment -> Fonts and Colors
If that doesn't help, you should check that you don't have an external addin that might be changing the colors...
Update - based on your comment - if you're using the Productivity Power Tools you might need to disable the Colorized Parameter Help Option from Tools -> Options -> Productivity Power Tools -> Colorized Parameter Help...
Another option is to try to Repair your installation of VS2012
I have also run into this problem and I have found the culprit to be the Productivity Power Tools. There is a workaround to get the syntax highlighting for structs to reappear. You have to turn off Colorized Parameter Help in the Productivity Power Tools options and restart Visual Studio.
This can be found at Tools > Options > Productivity Power Tools > Colorized Parameter Help
Also see this bug report for more information.
I think I found another solution to this problem, which lets you leave the Colorized Parameter Help feature turned on.
In Fonts and Colors, I specified a value for the "Signature Help - User Types(Value Types)" item, and I don't have the problem any more.
Note: I also have the Color Theme Editor extension installed - I'm not sure if this plays any part in the effectiveness of the workaround (but I had it installed before as well, so the extension alone didn't fix the problem).
Also, someone posted the bug on MS Connect: http://connect.microsoft.com/VisualStudio/feedback/details/770603/text-editor-the-type-color-for-structs-is-black
I've tried turning off the Colorized Power Tools parameter, uninstall and reinstall Power Tools and "Repair" of Visual Studio, none of which worked.
What ended up working was deleting the .suo and .dotSettings files in the same directory as the Solution File (.sln).
来源：https://stackoverflow.com/questions/14253879/visual-studio-2012-code-highlighting-for-structs