C# openxml removal of paragraph

Question

I am trying to remove paragraph (I'm using some placeholder text to do generation from docx template-like file) from .docx file using OpenXML, but whenever I remove paragraph it breaks the foreach loop which I'm using to iterate trough.

MainDocumentPart mainpart = doc.MainDocumentPart;
IEnumerable<OpenXmlElement> elems = mainPart.Document.Body.Descendants();

foreach(OpenXmlElement elem in elems){
    if(elem is Text && elem.InnerText == "##MY_PLACE_HOLDER##")
    {
        Run run = (Run)elem.Parent;
        Paragraph p = (Paragraph)run.Parent;
        p.RemoveAllChildren();
        p.Remove();
    }
}

This works, removes my place holder and paragraph it is in, but foreach loop stops iterating. And I need more things to do in my foreach loop.

Is this ok way to remove paragraph in C# using OpenXML and why is my foreach loop stopping or how to make it not stop? Thanks.

Answer 1

You have to use two cycles first that stores items you want to delete and second that deletes items. something like this:

List<Paragraph> paragraphsToDelete = new List<Paragraph>();
foreach(OpenXmlElement elem in elems){
    if(elem is Text && elem.InnerText == "##MY_PLACE_HOLDER##")
    {
        Run run = (Run)elem.Parent;
        Paragraph p = (Paragraph)run.Parent;
        paragraphsToDelete.Add(p);
    }
}

foreach (var p in paragraphsToDelete)
{
        p.RemoveAllChildren();
        p.Remove();
}