• iTextSharp 5.5.13.2 
• stackoverflow.com – Split PDF into multiple PDFs using iTextsharp

ติดตั้ง

PM> Install-Package iTextSharp -Version 5.5.13.2

หน้าแรกของ PDF คือหน้าที่ 1

using iTextSharp.text;
using iTextSharp.text.pdf;
using System;
using System.Reflection;

namespace ConsoleApp1
{
    class Program
    {
        private static readonly log4net.ILog log = log4net.LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);

        static void Main(string[] args)
        {
            try
            {
                log.Info("*********************************");
                log.Info("************* BEGIN *************");
                log.Info(AppDomain.CurrentDomain.FriendlyName);

                string sourcePDFpath = "iptest.pdf";
                string outputPDFpath = "optest.pdf";
                int startpage = 1;
                int endpage = 1;
                ExtractPages(sourcePDFpath, outputPDFpath, startpage, endpage);

                log.Info("************** END **************");
                log.Info("");
            }
            catch (Exception ex)
            {
                log.Error(ex.Message);
                log.Error(ex.ToString());
            }
        } // end main

        private static void ExtractPages(string sourcePDFpath, string outputPDFpath, int startpage, int endpage)
        {
            PdfReader reader = null;
            Document sourceDocument = null;
            PdfCopy pdfCopyProvider = null;
            PdfImportedPage importedPage = null;

            reader = new PdfReader(sourcePDFpath);
            sourceDocument = new Document(reader.GetPageSizeWithRotation(startpage));
            pdfCopyProvider = new PdfCopy(sourceDocument, new System.IO.FileStream(outputPDFpath, System.IO.FileMode.Create));

            sourceDocument.Open();

            for (int i = startpage; i <= endpage; i++)
            {
                importedPage = pdfCopyProvider.GetImportedPage(reader, i);
                pdfCopyProvider.AddPage(importedPage);
            }
            sourceDocument.Close();
            reader.Close();
        }
    } // end class
}