c# - HTML to PDF convertion issue -

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i have 2 problems when converting html (mvc razor page) pdf non utf8 characters.

1) generating pdf chinese characters 2) whenever enable addition of css files exception " input string not in correct format." when comment own css , use getdefaultcss, error doesn't show , pdf being generated chinese characters appear question marks (?)

here code:

public static byte[] buildpdfcontent<t>(t model, string template, controllercontext context) {     corecontroller controller = (corecontroller)context.controller;     var html = controller.renderrazorviewtostring(template, model);     memorystream msinput = new memorystream(asciiencoding.default.getbytes(html));     memorystream msoutput = new memorystream();      string fontawesomecss = httpcontext.current.server.mappath("/content/css/font-awesome.min.css");     string bootstrapcss = httpcontext.current.server.mappath("/content/css/bootstrap.css");     string sitecss = httpcontext.current.server.mappath("/content/css/site.css");     document doc = new document(itextsharp.text.pagesize.a4);     doc.setmargins(doc.leftmargin, doc.rightmargin, 35, 0);     pdfwriter pdfwriter = pdfwriter.getinstance(doc, msoutput);     doc.open();     var tagprocessors = (defaulttagprocessorfactory)tags.gethtmltagprocessorfactory();     tagprocessors.removeprocessor(html.tag.img); // remove default processor     tagprocessors.addprocessor(html.tag.img, new customimagetagprocessor()); // use our new processor     cssfilesimpl cssfiles = new cssfilesimpl();     cssfiles.add(xmlworkerhelper.getcss(new filestream(fontawesomecss, filemode.open)));     cssfiles.add(xmlworkerhelper.getcss(new filestream(bootstrapcss, filemode.open)));     cssfiles.add(xmlworkerhelper.getcss(new filestream(sitecss, filemode.open)));     //cssfiles.add(xmlworkerhelper.getinstance().getdefaultcss());     styleattrcssresolver cssresolver = new styleattrcssresolver(cssfiles);     var hpc = new htmlpipelinecontext(new cssappliersimpl(new unicodefontfactory()));     hpc.setacceptunknown(true).autobookmark(true).settagfactory(tagprocessors); // inject tagprocessors     htmlpipeline htmlpipeline = new htmlpipeline(hpc, new pdfwriterpipeline(doc, pdfwriter));     ipipeline pipeline = new cssresolverpipeline(cssresolver, htmlpipeline);     xmlworker worker = new xmlworker(pipeline, true);     xmlparser xmlparse = new xmlparser(true, worker);     xmlparse.parse(msinput);     doc.close();     return msoutput.toarray();

}

private class unicodefontfactory : fontfactoryimp {     private static readonly string fontpath = path.combine(environment.getfolderpath(environment.specialfolder.fonts),       "arialuni.ttf");      private readonly basefont _basefont;      public unicodefontfactory()     {         _basefont = basefont.createfont(fontpath, basefont.identity_h, basefont.embedded);      }      public override font getfont(string fontname, string encoding, bool embedded, float size, int style, basecolor color,       bool cached)     {         return new font(_basefont, size, style, color);     } }


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