Add text to footer using openxml

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Does anybody know how to add text to a footer using OpenXML? Unfortunately, knowing how to add text to the document part is not helping much since footer/headers are setup differently and don't seem to have corresponding parts.

What I have tried:

FooterPart footer = _doc.MainDocumentPart.FooterParts.ElementAtOrDefault(0);
Paragraph paragraph = footer.AddPart<paragraph>(paragraph);

Posted 10-Jan-23 12:09pm

Darryl Bryk

Updated 13-Jan-23 10:02am

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Darryl Bryk · Answer 1 · 2023-01-13T10:02:00

Solution 2

Good solution from Seergius96 on StackOverflow:

C#

doc = WordprocessingDocument.Open(_stream, true);

FooterPart footerPart = doc.MainDocumentPart.FooterParts.LastOrDefault();
footerPart.Footer.AppendChild(new Paragraph(new Run(new Text("CUI\n"))));

Posted 13-Jan-23 10:02am

Darryl Bryk

Sandeep Mewara · Answer 2 · 2023-01-10T15:53:00

As shared here[^],

Quote:
The headers and footers aren't in the MainDocumentPart.Document, they are subparts in the HeaderParts and FooterParts[^] collections off the MainDocumentPart[^]. So you'll need to process each part separately. Fortunately, all of the parts share a common base class, OpenXmlPart[^], so you can put them together into a list and process them in a loop. Since you'll be dealing with the base class, you'll need to use RootElement[^] property instead of Document as a starting point to get the Descendants.

So the end result would look something like this:

C#

var partsToUpdate = new List<OpenXmlPart> { doc.MainDocumentPart }
    .Concat(doc.MainDocumentPart.HeaderParts)
    .Concat(doc.MainDocumentPart.FooterParts);

foreach (var part in partsToUpdate)
{
    var elements = part.RootElement
        .Descendants<SdtElement>()
        .Where(s => s.SdtProperties.ChildElements.Count > 0 &&
                    s.SdtProperties.GetFirstChild<Tag>()?.Val == contentControlTag);

    foreach (var element in elements)
    {
        if (element == null)
        {
            continue;
        }

        var elementText = element.Descendants<Text>();

        if (elementText != null)
        {
            var elementTextValue = elementText.FirstOrDefault();

            if (elementTextValue != null)
            {
                elementTextValue.Text = text;
            }
            elementText.Skip(1).ToList().ForEach(t => t.Remove());
        }
    }
}