C#: Merge PDF Files

Project Description

Merge PDF Files using the iTextSharp library.

We pass a set of PDF files to the method and get one file with all the passed files merged.

Code

using System;
using System.Collections.Generic;
using System.Text;
using System.IO;
using iTextSharp.text;
using iTextSharp.text.pdf;
namespace PDFManager
{
public class  PDFManager
{
public void  MergePDFFiles(string[] sourceFiles, string  destinationFile)
{
try
{
int f = 0;
// we create a reader for a certain document
PdfReader reader = new  PdfReader(sourceFiles[f]);
// we retrieve the total number of pages
int n = reader.NumberOfPages;
// step 1: creation of a document-object
Document document = new  Document(reader.GetPageSizeWithRotation(1));
// step 2: we create a writer that listens to the document
PdfWriter writer = PdfWriter.GetInstance(document, new  FileStream(destinationFile, FileMode.Create));
// step 3: we open the document
document.Open();
PdfContentByte cb = writer.DirectContent;
PdfImportedPage page;
int rotation;
// step 4: we add content
while (f < sourceFiles.Length)
{
int i = 0;
while (i < n)
{
i++;
document.SetPageSize(reader.GetPageSizeWithRotation(i));
document.NewPage();
page = writer.GetImportedPage(reader, i);
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);
}
}
f++;
if (f < sourceFiles.Length)
{
reader = new  PdfReader(sourceFiles[f]);
// we retrieve the total number of pages
n = reader.NumberOfPages;
}
}
// step 5: we close the document
document.Close();
}
catch (Exception e)
{
throw e;
}
}
}
}