Insert page into existing PDF using itextsharp

Question

We use itextsharp to create one PDF file from several PDF files. How to insert a new page into a PDF file with several pages already in the file? When I use the add page, it overwrites existing pages and saves only 1 page that has been selected.

Here is the code that I use to add a page to an existing PDF:

PdfReader reader = new PdfReader(sourcePdfPath);
                Document document = new Document(reader.GetPageSizeWithRotation(1));
                PdfCopy pdfCopy = new PdfCopy(document, new System.IO.FileStream(outputPdfPath, System.IO.FileMode.Create));
                MemoryStream memoryStream = new MemoryStream();
                PdfWriter writer = PdfWriter.GetInstance(document, memoryStream);
                document.AddDocListener(writer);
                document.Open();

                for (int p = 1; p <= reader.NumberOfPages; p++)
                {
                    if (pagesToExtract.FindIndex(s => s == p) == -1) continue;
                    document.SetPageSize(reader.GetPageSize(p));
                    document.NewPage();
                    PdfContentByte cb = writer.DirectContent;
                    PdfImportedPage pageImport = writer.GetImportedPage(reader, p);

                    int rot = reader.GetPageRotation(p);
                    if (rot == 90 || rot == 270)
                    {
                        cb.AddTemplate(pageImport, 0, -1.0F, 1.0F, 0, 0, reader.GetPageSizeWithRotation(p).Height);
                    }
                    else
                    {
                        cb.AddTemplate(pageImport, 1.0F, 0, 0, 1.0F, 0, 0);
                    }

                    pdfCopy.AddPage(pageImport);
                }

                pdfCopy.Close();

Answer 1

This code works. To output the results you need to have another file.

private static void AppendToDocument(string sourcePdfPath1, string sourcePdfPath2, string outputPdfPath)
{
    using (var sourceDocumentStream1 = new FileStream(sourcePdfPath1, FileMode.Open))
    {
        using (var sourceDocumentStream2 = new FileStream(sourcePdfPath2, FileMode.Open))
        {
            using (var destinationDocumentStream = new FileStream(outputPdfPath, FileMode.Create))
            {
                var pdfConcat = new PdfConcatenate(destinationDocumentStream);
                var pdfReader = new PdfReader(sourceDocumentStream1);

                var pages = new List<int>();
                for (int i = 0; i < pdfReader.NumberOfPages; i++)
                {
                    pages.Add(i);
                }

                pdfReader.SelectPages(pages);
                pdfConcat.AddPages(pdfReader);

                pdfReader = new PdfReader(sourceDocumentStream2);

                pages = new List<int>();
                for (int i = 0; i < pdfReader.NumberOfPages; i++)
                {
                    pages.Add(i);
                }

                pdfReader.SelectPages(pages);
                pdfConcat.AddPages(pdfReader);

                pdfReader.Close();
                pdfConcat.Close();
            }
        }
    }
}

Answer 2

, , .

:

private static void AppendToDocument(string sourcePdfPath, string outputPdfPath, List<int> neededPages)
    {

        var sourceDocumentStream = new FileStream(sourcePdfPath, FileMode.Open);
        var destinationDocumentStream = new FileStream(outputPdfPath, FileMode.Create);
        var pdfConcat = new PdfConcatenate(destinationDocumentStream);

        var pdfReader = new PdfReader(sourceDocumentStream);
        pdfReader.SelectPages(neededPages);
        pdfConcat.AddPages(pdfReader);

        pdfReader.Close();
        pdfConcat.Close();
    }

Answer 3

- , src - IEnumerable<string> pdf. , pdf . PdfConcatenate iTextSharp.

var result = "combined.pdf";
var fs = new FileStream(result, FileMode.Create);
var conc = new PdfConcatenate(fs, true);
foreach(var s in src) {
    var r = new PdfReader(s);
    conc.AddPages(r);
}
conc.Close();

Answer 4

PdfCopy Document. , , .

PdfStamper.InsertPage(pageNum, rectangle), PdfImportedPage .

, PdfImportedPage , ( " ", javascripts ..), , , ... PdfCopy.

Stamper, , , PdfCopy , .

, , . , .

Answer 5

To align the page count with a short number of 4:

private static void AppendToDocument(string sourcePdfPath)
{
    var tempFileLocation = Path.GetTempFileName();
    var bytes = File.ReadAllBytes(sourcePdfPath);

    using (var reader = new PdfReader(bytes))
    {
        var numberofPages = reader.NumberOfPages;
        var modPages = (numberofPages % 4);
        var pages = modPages == 0 ? 0 : 4 - modPages;

        if (pages == 0)
            return;

        using (var fileStream = new FileStream(tempFileLocation, FileMode.Create, FileAccess.Write))
        {
            using (var stamper = new PdfStamper(reader, fileStream))
            {
                var rectangle = reader.GetPageSize(1);
                for (var i = 1; i <= pages; i++)
                    stamper.InsertPage(numberofPages + i, rectangle);
            }
        }
    }

    File.Delete(sourcePdfPath);
    File.Move(tempFileLocation, sourcePdfPath);
}