Inserting text after a bookmark in openxml

Question

I am looking for a way to insert some text after a bookmark in a word doc using openxml. So far, i have been able to locate the bookmark using the following:

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Answer 1

You can not assume that a bookmark starts and ends in one paragraph. Bookmarks can start and end in different elements and be children of:

bdo (§17.3.2.3); body (§17.2.2); comment (§17.13.4.2); customXml (§17.5.1.6); customXml (§17.5.1.4); customXml (§17.5.1.5); customXml (§17.5.1.3); deg (§22.1.2.26); del (§17.13.5.14); den (§22.1.2.28); dir (§17.3.2.8); docPartBody (§17.12.6); e (§22.1.2.32); endnote (§17.11.2); fldSimple (§17.16.19); fName (§22.1.2.37); footnote (§17.11.10); ftr (§17.10.3); hdr (§17.10.4); hyperlink (§17.16.22); ins (§17.13.5.18); lim (§22.1.2.52); moveFrom (§17.13.5.22); moveTo (§17.13.5.25); num (§22.1.2.75); oMath (§22.1.2.77); p (§17.3.1.22); rt (§17.3.3.24); rubyBase (§17.3.3.27); sdtContent (§17.5.2.34); sdtContent (§17.5.2.33); sdtContent (§17.5.2.35); sdtContent (§17.5.2.36); smartTag (§17.5.1.9); sub (§22.1.2.112); sup (§22.1.2.114); tbl (§17.4.38); tc (§17.4.66); tr (§17.4.79)

https://msdn.microsoft.com/en-gb/library/documentformat.openxml.wordprocessing.bookmarkstart(v=office.15).aspx

This means you need to look at all the BookmarkEnd elements in the document when checking for the required BookmarkEnd element.

Body body = mainPart.Document.GetFirstChild();
var bookMarkStarts = body.Descendants();
var bookMarkEnds = body.Descendants();

foreach (BookmarkStart bookMarkStart in bookMarkStarts)
{
    if (bookMarkStart.Name == bookmarkName)
    {
        //Get the id of the bookmark start to find the bookmark end
        var id = bookMarkStart.Id.Value;
        var bookmarkEnd = bookMarkEnds.Where(i => i.Id.Value == id).First();

        var runElement = new Run(new Text("Hello World!!!"));

        bookmarkEnd.Parent.InsertAfter(runElement, bookmarkEnd);
    }
}
mainPart.Document.Save();

You may want to check that a Run can be added to the parent and add to a different ancestor or create a new Paragraph.

(I would have liked to have added this as a comment to Flowerking's answer but I can't comment so I have modified their code in this answer.)