c# - Convert HTML style (dotted underline) to PDF using iTextSharp -


i trying generate pdf below html i.e. text dotted underline. (below sample actual html bigger)

<u style="border-bottom: 1px dotted #000;text-decoration: none;"> hello </u>

as explained in how convert html pdf using itextsharp . output supposed have dotted line can see in html file, pdf generated itextsharp shows normal underline , not dotted underline. here complete method

   public void usingxmlworker()     {                     byte[] bytes;          //create stream can write to, in case memorystream         using (var ms = new memorystream())         {              using (var doc = new document())             {                 //create writer that's bound our pdf abstraction , our stream                 using (var writer = pdfwriter.getinstance(doc, ms))                 {                      //open document writing                     doc.open();                      //sample html , css                     var example_html = @"<u style=""border-bottom: 1px dotted #000;text-decoration: none;"" >&nbsp;hello&nbsp;</u>";                      using (var srhtml = new stringreader(example_html))                     {                         //parse html                         itextsharp.tool.xml.xmlworkerhelper.getinstance().parsexhtml(writer, doc, srhtml);                     }                      //var example_html = @"<u class=""dottedborder"">&nbsp;hello&nbsp;</u>";                     //var example_css = @".dottedborder{border-bottom: 1px dotted #000;text-decoration: none;font-size:38px;}";                     //using (var mscss = new memorystream(system.text.encoding.utf8.getbytes(example_css)))                     //{                     //    using (var mshtml = new memorystream(system.text.encoding.utf8.getbytes(example_html)))                     //    {                      //        //parse html                     //        itextsharp.tool.xml.xmlworkerhelper.getinstance().parsexhtml(writer, doc, mshtml, mscss);                     //    }                     //}                     doc.close();                 }             }             bytes = ms.toarray();         }           var testfile = path.combine(environment.getfolderpath(environment.specialfolder.desktop), "test.pdf");         system.io.file.writeallbytes(testfile, bytes);     }

i tried other methods below code still see pdf generated normal underline opposed dotted underline. missing here ?

                    var example_html = @"<u class=""dottedborder"">&nbsp;hello&nbsp;</u>";                     var example_css = @".dottedborder{border-bottom: 1px dotted #000;text-decoration: none;font-size:38px;}";                     using (var mscss = new memorystream(system.text.encoding.utf8.getbytes(example_css)))                     {                         using (var mshtml = new memorystream(system.text.encoding.utf8.getbytes(example_html)))                         {                              //parse html                             itextsharp.tool.xml.xmlworkerhelper.getinstance().parsexhtml(writer, doc, mshtml, mscss);                         }                     }

according css conformance list, borders supported on table cells.

the line seeing <u> tag's default bottom border , text-decoration code being overwritten default code <u> tag. if watch resolvestyles method in itextsharp\tool\xml\css\styleattrcssresolver.cs, top chunk (around 170 in 5.5.6) sets keys , values tagcss correctly finds , sets property. next block of code after that, however, special-cases html tags , forces rules upon then.

// inherit css parent tags, defined in provided cssinheritancerules or if property = inherit idictionary<string, string> css = t.css; if (t.name != null) {     if (t.name.equals(html.tag.i) || t.name.equals(html.tag.cite)         || t.name.equals(html.tag.em) || t.name.equals(html.tag.var)         || t.name.equals(html.tag.dfn) || t.name.equals(html.tag.address)) {             tagcss[css.property.font_style] = css.value.italic;     }     else if (t.name.equals(html.tag.b) || t.name.equals(html.tag.strong)) {         tagcss[css.property.font_weight] = css.value.bold;     }     else if (t.name.equals(html.tag.u) || t.name.equals(html.tag.ins)) {         tagcss[css.property.text_decoration] = css.value.underline;     }     else if (t.name.equals(html.tag.s) || t.name.equals(html.tag.strike)               || t.name.equals(html.tag.del)) {                  tagcss[css.property.text_decoration] = css.value.line_through;     }     else if (t.name.equals(html.tag.big)) {         tagcss[css.property.font_size] = css.value.larger;     }     else if (t.name.equals(html.tag.small)) {         tagcss[css.property.font_size] = css.value.smaller;     } }

since block happens after css you'll see can't remove underline on <u> tag because turned on. similarly, can't un-bold <strong> tag, un-italic <em> or explicitly set font size on <big> tag (i forgot tag!) unless have parent container's font size set.

so unfortunately, short of modifying source i'm not sure looking possible.


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