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

        public override void Close()
        {
            if (open) {
                PdfReaderInstance ri = currentPdfReaderInstance;
                pdf.Close();
                base.Close();
                if (ri != null) {
                    try {
                        ri.Reader.Close();
                        ri.ReaderFile.Close();
                    }
                    catch (IOException) {
                        // empty on purpose
                    }
                }
            }
        }

 /// <summary>
 /// Concatenates two or more PDF files into one file.
 /// </summary>
 /// <param name="inputFiles">A string array containing the names of the pdf files to concatenate</param>
 /// <param name="outputFile">Name of the concatenated file.</param>
 public void ConcatenatePDFFiles(String[] inputFiles, String outputFile)
 {
     if (inputFiles != null && inputFiles.Length > 0)
     {
         if (!String.IsNullOrEmpty(outputFile) && !String.IsNullOrWhiteSpace(outputFile))
         {
             var concatDocument = new iTextSharpText.Document();
             var outputCopy     = new iTextSharpPDF.PdfCopy(concatDocument, new FileStream(outputFile, FileMode.Create, FileAccess.ReadWrite));
             concatDocument.Open();
             try
             {
                 for (int loop = 0; loop <= inputFiles.GetUpperBound(0); loop++)
                 {
                     var inputDocument = new iTextSharpPDF.PdfReader(inputFiles[loop]);
                     for (int pageLoop = 1; pageLoop <= inputDocument.NumberOfPages; pageLoop++)
                     {
                         concatDocument.SetPageSize(inputDocument.GetPageSizeWithRotation(pageLoop));
                         outputCopy.AddPage(outputCopy.GetImportedPage(inputDocument, pageLoop));
                     }
                     inputDocument.Close();
                     outputCopy.FreeReader(inputDocument);
                     inputDocument = null;
                 }
                 concatDocument.Close();
                 outputCopy.Close();
             }
             catch
             {
                 if (concatDocument != null && concatDocument.IsOpen())
                 {
                     concatDocument.Close();
                 }
                 if (outputCopy != null)
                 {
                     outputCopy.Close();
                 }
                 if (File.Exists(outputFile))
                 {
                     try
                     {
                         File.Delete(outputFile);
                     }
                     catch { }
                 }
                 throw;
             }
         }
         else
         {
             throw new ArgumentNullException("outputFile", exceptionArgumentNullOrEmptyString);
         }
     }
     else
     {
         throw new ArgumentNullException("inputFiles", exceptionArgumentNullOrEmptyString);
     }
 }