vs2013 类名黑色，修改不起作用，最后找到解决办法。
http://stackoverflow.com/questions/10970305/how-can-i-get-user-type-c-sharp-syntax-highlighting-working-again-in-vs-2012-rc
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Here is a simple solution. Go to the directory where devenv is (for 2012 RC), and type devenv.exe /setup. It will fix your problem.
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用cmd命令行定位到 devenv.exe 所在目录，然后运行 devenv.exe /setup ，解决。
如：
D:\Program Files (x86)\Microsoft Visual Studio 12.0\Common7\IDE>devenv.exe