iTextSharp.text.pdf.PdfCopy.GetImportedPageImpl C# (CSharp) Метод

        protected PdfImportedPage GetImportedPageImpl(PdfReader reader, int pageNumber)
        {
            if (currentPdfReaderInstance != null) {
                    if (currentPdfReaderInstance.Reader != reader) {
                        try {
                            currentPdfReaderInstance.Reader.Close();
                            currentPdfReaderInstance.ReaderFile.Close();
                        }
                        catch (IOException) {
                            // empty on purpose
                        }
                        currentPdfReaderInstance = base.GetPdfReaderInstance(reader);
                    }
                }
                else {
                    currentPdfReaderInstance = base.GetPdfReaderInstance(reader);
                }
                return currentPdfReaderInstance.GetImportedPage(pageNumber);
        }