Splitting a PDF document is the process of saving each page into a new, separate PDF document. For example, splitting a three-page PDF document will produce three, single-page PDF documents.

To split a PDF document using ImageGear:

1. Read the PDF document into a System.IO.Stream object.

2. Read the stream using ImGearFileFormats.LoadDocument(), casting the ImGearDocument object returned to an ImGearPDFDocument object.

3. Determine the PDF page count using the ImGearPDFDocument.Pages property.

4. For each PDF page:

   1. Construct a new ImGearPDFDocument object to create an empty PDF document.
   2. Add the page to the empty PDF document using the ImGearPDFDocument.InsertPages() method.
   3. Save the single-page PDF to disk or memory using the ImGearPDFDocument.Save() method.

The following is a sample method that illustrates how to split a single PDF document into several single-page PDF documents:

PDF support needs to be initialized first for this snippet to work. To get familiar with initializing IGNET, initializing PDF support, loading a PDF, saving a PDF, and terminating PDF support, try any one of the tutorials.

C#

using System;
using System.IO;
using System.Text;

using ImageGear.Core;
using ImageGear.Formats;
using ImageGear.Windows.Forms;
using ImageGear.Formats.PDF;

public void SplitPDFDocument(String inputPath, String outputDirectory)
{
   const int FIRST_PAGE = 0;
   const int ONE_PAGE = 1;

   // Ensure output directory exists.
   if ( !System.IO.Directory.Exists(outputDirectory) )
   {
       Directory.CreateDirectory(outputDirectory);
   }

   // Open file for reading.
   using ( FileStream pdfData = new FileStream(inputPath, FileMode.Open,
       FileAccess.Read) )
   {
       // Read PDF document to memory.
       using ( ImGearPDFDocument igSourceDocument = ImGearFileFormats.LoadDocument(
           pdfData, FIRST_PAGE, (int)ImGearPDFPageRange.ALL_PAGES)
           as ImGearPDFDocument )
       {
           // For each page in document.
           for ( int i = 0; i < igSourceDocument.Pages.Count; i++ )
           {
               // Construct the output filepath.
               String outputFileName = String.Format("{0}_{1}.pdf",
                   Path.GetFileNameWithoutExtension(inputPath), i + 1);
               String outputPath = System.IO.Path.Combine(outputDirectory, outputFileName);

               // Create a new empty PDF document.
               using ( ImGearPDFDocument igTargetDocument = new ImGearPDFDocument() )
               {
                   // Insert page into new PDF document.
                   igTargetDocument.InsertPages(
                       (int)ImGearPDFPageNumber.BEFORE_FIRST_PAGE, igSourceDocument,
                       i, ONE_PAGE, ImGearPDFInsertFlags.DEFAULT);

                   // Save new PDF document to file.
                   igTargetDocument.Save(outputPath, ImGearSavingFormats.PDF,
                       FIRST_PAGE, FIRST_PAGE, ONE_PAGE,
                       ImGearSavingModes.OVERWRITE);
               }
           }
       }
   }
}

Refer to Samples and Demos documentation.