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

        protected internal void ReadPdfPartial() {
            try {
                fileLength = tokens.File.Length;
                pdfVersion = tokens.CheckPdfHeader();
                try {
                    ReadXref();
                }
                catch (Exception e) {
                    try {
                        rebuilt = true;
                        RebuildXref();
                        lastXref = -1;
                    }
                    catch (Exception ne) {
                        throw new InvalidPdfException("Rebuild failed: " + ne.Message + "; Original message: " + e.Message);
                    }
                }
                ReadDocObjPartial();
                ReadPages();
            }
            catch (IOException e) {
                try{tokens.Close();}catch{}
                throw e;
            }
        }