How to Merge Multiple Runtime-Generated PDFs Using ITextSharp?
Dec 27, 2024 am 08:18 AM
How to Merge and Print Multiple PDFs Generated at Runtime Using ITextSharp?
To merge multiple PDFs generated at runtime using ITextSharp, you have two primary options: using the PdfCopy class family or the PdfWriter class.
PdfCopy Family
The Pdf*Copy* classes allow you to merge PDFs while preserving their original format and interactive annotations. For this approach, follow these steps:
- Initialize an empty PDF document.
- Create a PdfCopy object.
- Loop through the generated PDF bytes.
- For each byte array, create a PdfReader and import its pages into the PdfCopy object.
Example Using PdfCopy:
byte[] mergedPdf = null;
using (MemoryStream ms = new MemoryStream())
{
using (Document document = new Document())
{
using (PdfCopy copy = new PdfCopy(document, ms))
{
document.Open();
for (int i = 0; i < pdfBytes.Count; ++i)
{
PdfReader reader = new PdfReader(pdfBytes[i]);
int n = reader.NumberOfPages;
for (int page = 0; page < n; )
{
copy.AddPage(copy.GetImportedPage(reader, ++page));
}
}
}
}
mergedPdf = ms.ToArray();
}
PdfWriter Class
The PdfWriter class allows you to integrate pages from source PDFs into a new document without preserving their original interactivity. Use this approach if you are not concerned about annotations or other features in the source PDFs.
using (MemoryStream ms = new MemoryStream())
{
using (Document document = new Document())
{
using (PdfWriter writer = PdfWriter.GetInstance(document, ms))
{
document.Open();
for (int i = 0; i < pdfBytes.Count; ++i)
{
PdfReader reader = new PdfReader(pdfBytes[i]);
int n = reader.NumberOfPages;
for (int page = 0; page < n; )
{
PdfImportedPage importedPage = writer.GetImportedPage(reader, ++page);
writer.Add(importedPage);
}
reader.Close();
}
}
}
mergedPdf = ms.ToArray();
}
For more details, refer to the iTextSharp documentation or the code examples provided in the linked answer.
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