How to fill out a pdf file programmatically? (Dynamic XFA)

Tags: XFAfill formXMLformsiText 5

I have a dynamic XFA Form that I can fill out manually using Adobe Acrobat on my computer. Using iTextSharp I can read what the XFA XML data is and see the structure of the data. I am essentially trying to mimic that with iText using the following code:

PdfReader pdfReader = new PdfReader(sourceFilePath);
using (MemoryStream ms = new MemoryStream()) {
    using (PdfStamper stamper = new PdfStamper(pdfReader, ms)) {
        XfaForm xfaForm = new XfaForm(pdfReader);
        XmlDocument doc = new XmlDocument();
        xfaForm.DomDocument = doc;
        xfaForm.Changed = true;
        XfaForm.SetXfa(xfaForm, stamper.Reader, stamper.Writer);
    var bytes = ms.ToArray();
    File.WriteAllBytes(destinationtFilePath, bytes);
For some reason this code doesn't work.

Posted on StackOverflow on May 11, 2013 by jon333

This question was answered by the person who posted the question:

I found the issue. The replacement DomDocument needs to be the entire merged XML of the new document, not just the data or datasets portion.

I upvoted this answer, because it's not incorrect, but now that I think it's better to use the example from the book:

public byte[] ManipulatePdf(String src, String xml) {
    PdfReader reader = new PdfReader(src);
    using (MemoryStream ms = new MemoryStream()) {
        using (PdfStamper stamper = new PdfStamper(reader, ms)) {
            AcroFields form = stamper.AcroFields;
            XfaForm xfa = form.Xfa;
            xfa.FillXfaForm(XmlReader.Create(new StringReader(xml)));
        return ms.ToArray();

As you can see, it's not necessary to replace the whole XFA XML. If you use the FillXfaForm method, the data is sufficient.