Is there a CSS parser for C#?

ExCSS (supports CSS2.1 and CSS3) on GitHub: https://github.com/TylerBrinks/ExCSS.

Which is a newer version of the code project article: http://www.codeproject.com/KB/recipes/CSSParser.aspx

And a slightly slower search turns up the blog post "CSS parser class in .NET" which embeds this gist on GitHub (in case the blog ever dies).

There is a CSS grammar file for GoldParser:

http://goldparser.org/grammars/files/css.zip

GoldParser is easy to include in a C# project, and generates an real LALR parser - not some regex hack.

I wrote one, using the grammar specified in the CSS 2.1 spec. I have also released it now: for details, see http://www.modeltext.com/css/

Here you can find another one especially for C# with sample source.