Remove Document variables for OpenXML DOCX?

I'm trying to remove the doc variables from a DOCX file. Here is the code I'm using, but it doesn't remove any...

This is the complete code:

class Program
    {
        static void Main(string[] args)
        {
            string filePath = "C:\\..\\..sample.docx";
            Remove removedocvars = new Remove();
            removedocvars.RemoveDocVariables(filePath);

        }
    }

//method to开发者_如何学Python remove doc vars
  public void RemoveDocVariables(string fileName)
        {
            using (WordprocessingDocument doc = WordprocessingDocument.Open(fileName, true))
            {

                List<DocumentVariables> DocVarsToDelete = doc.MainDocumentPart.RootElement.Descendants<DocumentVariables>().ToList();
                foreach (DocumentVariables dc in DocVarsToDelete)
                {
                    dc.Remove();
                }
                doc.MainDocumentPart.Document.Save();
            }
        }

the variables are in the settings.xml file, so you have to use MainDocumentPart.DocumentSettingsPart.Settings.Descendants<>().

public void RemoveDocVariables(string fileName)
{
    using (var doc = WordprocessingDocument.Open(fileName, true))
    {
        doc.MainDocumentPart.DocumentSettingsPart.Settings.RemoveAllChildren<DocumentVariables>();
    }
}

If this is the extent of your code, then aren't you missing a call to the save method?

Something like:

    foreach (DocumentVariable dc in DocVarsToDelete)
    {
        dc.Remove();
    } 
    document.Save();

This is a 6 years old question, but I think it still would be valuable to add the answer. Your issue likely is related to this:

https://github.com/OfficeDev/Open-XML-SDK/issues/198

https://github.com/OfficeDev/Open-XML-SDK/issues/222

OpenXML used to be not like mixing of accessing mechanism until the patch mentioned in one of the link above was applied.