合并带书签的pdf和向pdf里加图片

using iTextSharp;
using iText = iTextSharp.text;
using iTextSharp.text.pdf;

        private void addPicToPdf()
        {
            var pgSize = new iText.Rectangle(1664, 2400);
            var doc = new iText.Document(pgSize, 50, 50, 50, 50);
            string existingPdf = @"c:\temp\foo.pdf";
            string newPdf = @"c:\temp\bar.pdf";
            string imagePath = @"c:\temp\images";
            PdfReader reader = null;
            if (File.Exists(existingPdf))
            {
                reader = new PdfReader(existingPdf);
            }
            var files = (new DirectoryInfo(imagePath)).GetFiles().OrderBy(p => p.Name).ToList();
            string bookmarkName = "";
            PdfWriter writer = PdfWriter.GetInstance(doc, new FileStream(newPdf, FileMode.Create));
            doc.Open();
            float totalHeight = 0;
            //读入已有文件
            if (reader != null)
            {
                for (int page = 0; page < reader.NumberOfPages; page++)
                {
                    doc.SetPageSize(pgSize);
                    doc.NewPage();
                    var pg = writer.GetImportedPage(reader, page + 1);
                    writer.DirectContent.AddTemplate(pg, 1f, 0, 0, 1f, 0, 0);//这里不考虑旋转，否则需要稍微调整一下
                }
                //导入书签，这里不考虑多级书签，只考虑单级，多级的话要检测Kid这个key，递归实现，稍微麻烦些
                IList<Dictionary<string, object>> book_mark = SimpleBookmark.GetBookmark(reader);
                foreach (Dictionary<string, object> bk in book_mark)
                {
                    string title = bk["Title"].ToString();
                    string[] words = Convert.ToString(bk["Page"]).Split(' ');
                    int page = 0;
                    if (!object.Equals(words, null))
                    {
                        page = Convert.ToInt32(words[0]);//如果是合并多个pdf文件，需要调整page，下面的pos则不需要调整
                    }
                    int pos = Convert.ToInt32(words[2]);
                    PdfAction obja3lvl = PdfAction.GotoLocalPage(page, new iTextSharp.text.pdf.PdfDestination(iTextSharp.text.pdf.PdfDestination.FITH, pos), writer);
                    PdfOutline objoutline3lvl = new PdfOutline(writer.RootOutline, obja3lvl, title, true);
                }
            }

            //原pdf导入完成，开始添加新图片
            for (int i = 0; i < files.Count; i++)
            {
                iText.Image jpg = iText.Image.GetInstance(files[i].FullName);
                string newBookmarkName = Regex.Replace(Path.GetFileNameWithoutExtension(files[i].Name), "[0-9]+", "");//文件名如：foo1.png, foo2.png, bar1.png......
                totalHeight += jpg.Height;
                if (totalHeight > 2290)
                {
                    doc.NewPage();
                    totalHeight = jpg.Height;
                }
                if (newBookmarkName != bookmarkName)
                {
                    bookmarkName = newBookmarkName;
                    var bookmark = new PdfOutline(writer.RootOutline, new PdfDestination(PdfDestination.FITH, writer.GetVerticalPosition(true)), newBookmarkName);
                }
                doc.Add(jpg);
            }
            doc.Close();
            MessageBox.Show("finish");
        }