itextsharp 通过 html 生成 pdf ，图片类型的页眉怎么加？

悬赏园豆：5 [已解决问题] 解决于 2016-07-31 13:50

用的itextsharp 5.5.4，不知道图片类型的页眉应该怎么加，见代码

 MemoryStream outputStream = new MemoryStream();//要把PDF写到哪个串流
                byte[] data = Encoding.UTF8.GetBytes(htmlText);//字串转成byte[]
                MemoryStream msInput = new MemoryStream(data);
                Document doc = new Document();//要写PDF的文件，建构子没填的话预设直式A4
                PdfWriter writer = PdfWriter.GetInstance(doc, outputStream);
                //指定文件预设开档时的缩放为100%
                PdfDestination pdfDest = new PdfDestination(PdfDestination.XYZ, 0, doc.PageSize.Height, 1f);
                //Rectangle rect = new Rectangle(36, 54, 559, 788);
                //writer.SetBoxSize("art", rect);
                HeaderFooter header = new HeaderFooter();
                writer.PageEvent = header;


                //开启Document文件 
                doc.Open();
               
                //HeaderFooter.PAGE_NUMBER = true;
                //使用XMLWorkerHelper把Html parse到PDF档里
                XMLWorkerHelper.GetInstance().ParseXHtml(writer, doc, msInput, null, Encoding.UTF8, new UnicodeFontFactory());
                //将pdfDest设定的资料写到PDF档
                PdfAction action = PdfAction.GotoLocalPage(1, pdfDest, writer);
                writer.SetOpenAction(action);
                // 重置页面数量
                doc.ResetPageCount();
                doc.Close();
                msInput.Close();
                outputStream.Close();