add page number to pdf document (itextsharp)

asp.net, c#, itext

Solution

You'll have to open the PDF with `iTextSharp` and add the page numbers yourself. I did something like this a while back, here's my function that might give you a start. The function adds the current page to the lower left, so you might have to place it somewhere else that fits your needs.

public static byte[] AddPageNumbers(byte[] pdf)
{
MemoryStream ms = new MemoryStream();
// we create a reader for a certain document
PdfReader reader = new PdfReader(pdf);
// we retrieve the total number of pages
int n = reader.NumberOfPages;
// we retrieve the size of the first page
Rectangle psize = reader.GetPageSize(1);

// step 1: creation of a document-object
Document document = new Document(psize, 50, 50, 50, 50);
// step 2: we create a writer that listens to the document
PdfWriter writer = PdfWriter.GetInstance(document, ms);
// step 3: we open the document

document.Open();
// step 4: we add content
PdfContentByte cb = writer.DirectContent;

int p = 0;
Console.WriteLine("There are " + n + " pages in the document.");
for (int page = 1; page <= reader.NumberOfPages; page++)
{
    document.NewPage();
    p++;

    PdfImportedPage importedPage = writer.GetImportedPage(reader, page);
    cb.AddTemplate(importedPage, 0, 0);

    BaseFont bf = BaseFont.CreateFont(BaseFont.HELVETICA, BaseFont.CP1252, BaseFont.NOT_EMBEDDED);
    cb.BeginText();
    cb.SetFontAndSize(bf, 10);
    cb.ShowTextAligned(PdfContentByte.ALIGN_LEFT, +p + "/" + n, 7, 44, 0);
    cb.EndText();
}
// step 5: we close the document
document.Close();
return ms.ToArray();
}

Problem

Original source