How do I add a document type to an XDocument?

Question

I have an existing XDocument object that I would like to add an XML doctype to. For example:

XDocument doc = XDocument.Parse(\"test\");
         


        

Answer 1

Just pass it to the XDocument constructor (full example):

XDocument doc = new XDocument(
    new XDocumentType("a", "-//TEST//", "test.dtd", ""),
    new XElement("a", "test")
);

or use XDocument.Add (the XDocumentType has to be added before the root element):

XDocument doc = new XDocument();
doc.Add(new XDocumentType("a", "-//TEST//", "test.dtd", ""));
doc.Add(XElement.Parse("test"));