How can I add text to a document footer using OpenXML? - openxml

Question

I have a document template that I want to append some text to the footer. I've seen ways of deleting the footer to replace it, and ways to replace text in the footer, but I want to keep the footer as is from the template and just add to it. I have code to add text to the main doc., but unfortunately, main doc. parts are not setup the same way as footer parts. This is easily accomplished in Interop by a range.InsertAfter(text), but end users need this to work sans Word.
FooterPart footer = _doc.MainDocumentPart.FooterParts.ElementAtOrDefault(0);
string rid = _doc.MainDocumentPart.GetIdOfPart(footer);
footer = _doc.MainDocumentPart.AddNewPart<FooterPart>(rid);
Paragraph para = footer.AddPart(new Paragraph(), rid);
Run run = para.AppendChild(new Run());

Answer 1

// get the last footer of the document
FooterPart footerPart = _doc.MainDocumentPart.FooterParts.LastOrDefault();
// create your paragraph. i created simple, but you will need to add style properties to the run or text class
Paragraph pr = new Paragraph(new Run(new Text("hello")));
// Insert the Paragraph to the end of the footer in footerPart.Footer
footerPart.Footer.AppendChild(pr);
Other way as you said would be putting a text to replace like "txttoreplace" and then you will find it and replace
IEnumerable<FooterPart> footerPartsList = Documento.MainDocumentPart.FooterParts.ToList();
foreach (FooterPart hp in footerPartsList)
foreach (Text text in hp.RootElement.Descendants<Text>())
{
if (text.Text.Contains("txttoreplace"))
{
text.Text = text.Text.Replace("txttoreplace", "new text");
}
}
And another way and the hardest would be, you inser the whole footer, with open xml productivity tools you get the c# code of the footer.xml, and then you delete the footer of the document and you insert.