iTextSharp.text.pdf.PdfReader.RemoveAnnotations C# (CSharp) Метод

        public void RemoveAnnotations() {
            pageRefs.ResetReleasePage();
            for (int k = 1; k <= pageRefs.Size; ++k) {
                PdfDictionary page = pageRefs.GetPageN(k);
                if (page.Get(PdfName.ANNOTS) == null)
                    pageRefs.ReleasePage(k);
                else
                    page.Remove(PdfName.ANNOTS);
            }
            catalog.Remove(PdfName.ACROFORM);
            pageRefs.ResetReleasePage();
        }
        

        static void test01(string file)
        {
            var db = RedisWrite.Db;

            if (!File.Exists(file))
            {
                return;
            }

            var reader = new iTextSharpPdf.PdfReader(file);

            reader.RemoveUnusedObjects();
            long fileSize = reader.FileLength;

            int currentPage = 1;

            var readerCopy = new iTextSharpPdf.PdfReader(file);

            readerCopy.RemoveUnusedObjects();
            readerCopy.RemoveAnnotations();
            readerCopy.RemoveFields();
            readerCopy.RemoveUsageRights();
            string CreationDate = "";

            foreach (KeyValuePair <string, string> KV in readerCopy.Info)
            {
                if (KV.Key == "CreationDate")
                {
                    CreationDate = KV.Value;
                }
                //readerCopy.Info.Remove(KV.Key);
            }

            //int headerSize = readerCopy.Metadata.Length;
            //string mt = Encoding.UTF8.GetString(readerCopy.Metadata);

            int max = reader.NumberOfPages;

            if (max > 5)
            {
                max = 2;
            }
            string key = DocumentStatic.buildId(max, fileSize);

            var obj = new Dictionary <string, object>()
            {
                { "id", long.Parse(key) },
                { "file_name", Path.GetFileNameWithoutExtension(file) },
                { "file_type", "pdf" },
                { "file_size", fileSize },
                { "file_created", CreationDate },
                { "page", max }
            };
            string jsonInfo = JsonConvert.SerializeObject(obj);
            var    bufInfo  = ASCIIEncoding.UTF8.GetBytes(jsonInfo);
            var    lsEntry  = new List <NameValueEntry>()
            {
                new NameValueEntry(0, LZ4.LZ4Codec.Encode(bufInfo, 0, bufInfo.Length))
            };

            for (int i = 1; i <= max; i++)
            {
                ////using (FileStream fs = new FileStream(@"C:\temp\" + i + "-.pdf", FileMode.Create, FileAccess.Write, FileShare.None))
                ////{
                ////    using (var d = new iTextSharpText.Document())
                ////    {
                ////        using (var w = new iTextSharpPdf.PdfCopy(d, fs))
                ////        {
                ////            d.Open();
                ////            w.AddPage(w.GetImportedPage(reader, i));
                ////            d.Close();
                ////        }
                ////    }
                ////}

                using (var ms = new MemoryStream())
                {
                    var docCopy = new iTextSharpText.Document(reader.GetPageSizeWithRotation(currentPage));
                    //var pdfCopy = new iTextSharpPdf.PdfCopy(docCopy, new FileStream(@"C:\temp\" + i + "-.pdf", FileMode.Create));
                    var pdfCopy = new iTextSharpPdf.PdfCopy(docCopy, ms);
                    docCopy.Open();
                    var page = pdfCopy.GetImportedPage(readerCopy, currentPage);
                    pdfCopy.SetFullCompression();
                    pdfCopy.AddPage(page);
                    currentPage += 1;
                    //long len = ms.Length;
                    docCopy.Close();
                    pdfCopy.Close();
                    //m_app.RedisUpdate(key, i.ToString(), ms.ToArray());

                    lsEntry.Add(new NameValueEntry(i, ms.ToArray()));
                }
            }
            readerCopy.Close();
            reader.Close();
            string did = db.StreamAdd("BUF", lsEntry.ToArray(), key + "-0");
        }