c# - Dotless fails silently when parsing Bootstrap 2.3.1 to CSS -

here's lesstransform class use parse .less files .css files:

public class lesstransform : ibundletransform {     public void process(bundlecontext context, bundleresponse response)     {         response.content = dotless.core.less.parse(response.content);         response.contenttype = "text/css";     } } 

i'm trying parse downloaded bootstrap.css file using lesstransform class. when method running, response.content has contents of bootstrap.

after call dotless.core.less.parse(), response.content blank. parser failing silently.

why?

your less parsing doesn't have error handling, errors being silently ignored. if handling errors, you'd see following:

expected '}' on line 577 in file '../bootstrap/mixins.less': [576]:  [577]:     .spanx (@index) when (@index > 0) {        --------------------^ [578]:       .span@{index} { .span(@index); } 

it looks bootstrap uses less syntax dotless not yet support. try older bootstrap version (i've used bootstrap 2.0 dotless before).

to implement error handling, need add ilogger implementation. this:

var config = new dotlessconfiguration {     loglevel = loglevel.error,     // put custom logger implementation here     logger = typeof(lesscsslogger) };  var lessengine = new enginefactory(config).getengine(); var outputcss = lessengine.transformtocss(response.content, null); response.content = outputcss; 

where lesscsslogger implements ilogger. dotless comes aspresponselogger might able use.