我想生成PDF，但它没有采用我需要的所有css，比如它不应用Margin，Padding，Align等。我也想把图像放在我的PDF上，但我不知道怎么做？以下是我的代码
MemoryStream memoryStream = new MemoryStream();
Document doc = new Document(iTextSharp.text.PageSize.LETTER, 10, 10, 42, 35);
PdfWriter writer = PdfWriter.GetInstance(doc, memoryStream);
HtmlPipelineContext htmlContext = new HtmlPipelineContext(null);
htmlContext.SetTagFactory(Tags.GetHtmlTagProcessorFactory());
//create a cssresolver to apply css
ICSSResolver cssResolver = XMLWorkerHelper.GetInstance().GetDefaultCssResolver(false);
cssResolver.AddCss("div{color: red; text-align:center; font-size:30px;}", true);
cssResolver.AddCss("h1{color: green;}", true);
//Create and attach pipline, without pipline parser will not work on css
IPipeline pipeline = new CssResolverPipeline(cssResolver, new HtmlPipeline(htmlContext, new PdfWriterPipeline(doc, writer)));
//Create XMLWorker and attach a parser to it
XMLWorker worker = new XMLWorker(pipeline, true);
XMLParser xmlParser = new XMLParser(worker);
//All is well open documnet and start writing.
doc.Open();
string htmltext = "<html><body><h1>This is Heading </h1><div>This is a div content.</div></body></html>";
xmlParser.Parse(new StringReader(htmltext));
//Done! close the documnet
doc.Close();