DeletePagesFromPdf.cs

using System.IO;
using System.Linq;
using PdfSharp.Pdf;
using PdfSharp.Pdf.IO;

// <?xml version="1.0" encoding="utf-8"?>
// <packages>
//   <package id="iTextSharp" version="5.5.9" targetFramework="net452" />
//   <package id="PDFsharp" version="1.32.3057.0" targetFramework="net452" />
// </packages>

namespace PdfTest
{
    class Program
    {
        static void Main(string[] args)
        {
            var range = Enumerable.Range(0, 1);
            var filePath = $@"D:\source.pdf";
            var outputFilePath = $@"D:\Destination.pdf";

            // use this if PdfSharp throws an exception about unsupported iref streams in newer pdf formats
            // filePath = WriteCompatiblePdf(filePath); 

            PdfDocument inputDocument = PdfReader.Open(filePath, PdfDocumentOpenMode.Import);
            PdfDocument outputDocument = new PdfDocument();
            outputDocument.Version = inputDocument.Version;
            outputDocument.Info.Title = inputDocument.Info.Title;
            outputDocument.Info.Creator = inputDocument.Info.Creator;

            foreach (var pageIndex in range)
            {
                outputDocument.AddPage(inputDocument.Pages[pageIndex]);
            }

            outputDocument.Save(outputFilePath);
        }

        /// <summary>
        /// uses itextsharp 4.1.6 to convert any pdf to 1.4 compatible pdf
        /// </summary>
        /// <param name="filePath"></param>
        /// <returns></returns>
        public static string WriteCompatiblePdf(string filePath)
        {
            string newPdfFilePath = Path.ChangeExtension(filePath, ".new.pdf");

            iTextSharp.text.pdf.PdfReader reader = new iTextSharp.text.pdf.PdfReader(filePath);
            iTextSharp.text.Document document = new iTextSharp.text.Document(reader.GetPageSizeWithRotation(1));

            iTextSharp.text.pdf.PdfWriter writer = iTextSharp.text.pdf.PdfWriter.GetInstance(document, new FileStream(newPdfFilePath, FileMode.Create));
            writer.SetPdfVersion(iTextSharp.text.pdf.PdfWriter.PDF_VERSION_1_4);

            document.Open();

            iTextSharp.text.pdf.PdfContentByte cb = writer.DirectContent;
            iTextSharp.text.pdf.PdfImportedPage page;

            for (int i = 1; i <= reader.NumberOfPages; i++)
            {
                document.SetPageSize(reader.GetPageSizeWithRotation(i));
                document.NewPage();
                page = writer.GetImportedPage(reader, i);
                int rotation = reader.GetPageRotation(i);
                if (rotation == 90 || rotation == 270)
                {
                    cb.AddTemplate(page, 0, -1f, 1f, 0, 0, reader.GetPageSizeWithRotation(i).Height);
                }
                else
                {
                    cb.AddTemplate(page, 1f, 0, 0, 1f, 0, 0);
                }
            }

            document.Close();

            return newPdfFilePath;
        }
    }
}