Recently I made a program where I take a pdf file and using PDFsharp fill in the form fields with required values. The code that I made works fine it writes the values just fine but the problem comes after you open the pdf and try to close it, you will get a the standard message "Do you want to save changes before closing" even thou you just opened and close the document. The code that I use looks like this:
string templateDocPath = @"Original.pdf";
using (PdfDocument myTemplate = PdfReader.Open(templateDocPath, PdfDocumentOpenMode.Modify))
{
PdfAcroForm form = myTemplate.AcroForm;
if (form.Elements.ContainsKey("/NeedAppearances"))
{
form.Elements["/NeedAppearances"] = new PdfBoolean(true);
}
else
{
form.Elements.Add("/NeedAppearances", new PdfBoolean(true));
}
PdfTextField testField = (PdfTextField)(form.Fields["Name"]);
testField.Value = new PdfString("NameTest");
testField.ReadOnly = true;
myTemplate.Save(@"Output.pdf");
myTemplate.Close();
}
When I was trying to solved the problem I found out that the message comes only after you add "/NeedAppearances" Element to the AcroForms. You need this element or the values you write on the document will not show.
Googling some more I found a forum (https://forum.pdfsharp.net/viewtopic.php?f=2&t=3741) where someone asked the same question but didn't get a clear answer, the last comment mentioned that "/NeedAppearances" says to the document to generate the new values. So when you open the document new values are generated, so you have to save them.
I would like to know if it's true and is there a way to remove the message?
