It seems like it’s not there, but I managed to do what I needed by reading the entire file and doing a series or twine as follows:
} (right brace) to split individual styles
{(left bracket) to break styles into element names and style values
(comma) to split the element names up
; (semicolon) to separate styles up
: (colon) to separate style names and values
I also needed to trim the spaces, CR and LF at each step and discard blank entries to make it neat.
ListDictionary, StringDictionary .
, :
CssDocument css = new CssDocument();
css.Load("c:\mycssfile.css");
ListDictionary myBodyStyles = css["body"];
string myBodyFontSize = css["body"]["font-size"];