Merge PDF files

If you in need to merge one or more pdf files and want to produce a single pdf file as output, below class can be used to merge the same.

// AddDocument(“c:\File\Pdf1.pdf”);

// AddDocument(“c:\File\Pdf2.pdf”);

// AddDocument(“c:\File\Pdf3.pdf”);

//Merge(“c:\File\outputPdf.pdf”);

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using iTextSharp.text.pdf;

using System.IO;

using iTextSharp.text;

    public class PdfMerge

    {

        private BaseFont baseFont;

        private bool enablePagination = false;

        private readonly List<PdfReader> documents;

        private int totalPages;

        public PdfMerge()

        {

            documents = new List<PdfReader>();

        }

        public BaseFont BaseFont

        {

            get { return baseFont; }

            set { baseFont = value; }

        }

        public bool EnablePagination

        {

            get { return enablePagination; }

            set

            {

                enablePagination = value;

                if (value && baseFont == null)

                    baseFont = BaseFont.CreateFont(BaseFont.HELVETICA, BaseFont.CP1252, BaseFont.NOT_EMBEDDED);

            }

        }

        public List<PdfReader> Documents

        {

            get { return documents; }

        }

        public void AddDocument(string filename)

        {

            documents.Add(new PdfReader(filename));

        }

        public void AddDocument(Stream pdfStream)

        {

            documents.Add(new PdfReader(pdfStream));

        }

        public void AddDocument(byte[] pdfContents)

        {

            documents.Add(new PdfReader(pdfContents));

        }

        public void AddDocument(PdfReader pdfDocument)

        {

            documents.Add(pdfDocument);

        }

        public void Merge(string outputFilename)

        {

            Merge(new FileStream(outputFilename, FileMode.Create));

        }

        public void Merge(Stream outputStream)

        {

            if (outputStream == null || !outputStream.CanWrite)

                throw new Exception("OutputStream is null");

            Document newDocument = null;

            try

            {

                newDocument = new Document();

                PdfWriter pdfWriter = PdfWriter.GetInstance(newDocument, outputStream);

                newDocument.Open();

                PdfContentByte pdfContentByte = pdfWriter.DirectContent;

                if (EnablePagination)

                    documents.ForEach(delegate(PdfReader doc)

                    {

                        totalPages += doc.NumberOfPages;

                    });

                int currentPage = 1;

                foreach (PdfReader pdfReader in documents)

                {

                    for (int page = 1; page <= pdfReader.NumberOfPages; page++)

                    {

                        newDocument.NewPage();

                        PdfImportedPage importedPage = pdfWriter.GetImportedPage(pdfReader, page);

                        pdfContentByte.AddTemplate(importedPage, 0, 0);

                        if (EnablePagination)

                        {

                            pdfContentByte.BeginText();

                            pdfContentByte.SetFontAndSize(baseFont, 9);

                            pdfContentByte.ShowTextAligned(PdfContentByte.ALIGN_CENTER,

                                string.Format("{0} de {1}", currentPage++, totalPages), 520, 5, 0);

                            pdfContentByte.EndText();

                        }

                    }

                }

                pdfWriter = null;

            }

            finally

            {

                outputStream.Flush();

                if (newDocument != null)

                    newDocument.Close();

                outputStream.Close();

            }

        }

     

    }