How to build an XDocument with a foreach and LINQ?

Question

I can use XDocument to build the following file which works fine:

XDocument xdoc = new XDocument
(
    new XDeclaration("1.0", "utf-8", null),
    new XElement(_pluralCamelNotation,
        new XElement(_singularCamelNotation,
            new XElement("id", "1"),
            new XElement("whenCreated", "2008-12-31")
        ),
        new XElement(_singularCamelNotation,
            new XElement("id", "2"),
            new XElement("whenCreated", "2008-12-31")
            )
        )
);

However, I need to build the XML file by iterating through a collection like this:

XDocument xdoc = new XDocument
(
    new XDeclaration("1.0", "utf-8", null));

foreach (DataType dataType in _dataTypes)
{
    XElement xelement = new XElement(_pluralCamelNotation,
        new XElement(_singularCamelNotation,
        new XElement("id", "1"),
        new XElement("whenCreated", "2008-12-31")
    ));
    xdoc.AddInterally(xelement); //PSEUDO-CODE
}

There is Add, AddFirst, AddAfterSelf, AddBeforeSelf, but I could get none of them to work in this context.

Is an iteration with LINQ like this possible?

Answer:

I took Jimmy's code suggestion with the root tag, changed it up a bit and it was exactly what I was looking for:

var xdoc = new XDocument(
    new XDeclaration("1.0", "utf-8", null),
    new XElement(_pluralCamelNotation,
        _dataTypes.Select(datatype => new XElement(_singularCamelNotation,
            new XElement("id", "1"),
            new XElement("whenCreated", "2008-12-31")
        ))
    )
);

Marc Gravell posted a better answer to this on this StackOverflow question.

Answer 1

You need a root element.

var xdoc = new XDocument(
    new XDeclaration("1.0", "utf-8", null),
    new XElement("Root",
        _dataTypes.Select(datatype => new XElement(datatype._pluralCamelNotation,
            new XElement(datatype._singlarCamelNotation),
            new XElement("id", "1"),
            new XElement("whenCreated", "2008-12-31")
        ))
    )
);

Answer 2

If I'm not mistaken, you should be able to use XDocument.Add():

XDocument xdoc = new XDocument
(
    new XDeclaration("1.0", "utf-8", null));

foreach (DataType dataType in _dataTypes)
{
    XElement xelement = new XElement(_pluralCamelNotation,
        new XElement(_singularCamelNotation,
        new XElement("id", "1"),
        new XElement("whenCreated", "2008-12-31")
    ));
    xdoc.Add(xelement);
}

Answer 3

I know it's very very old post but I stumbled across this today trying to solve the same problem. You have to add the element to the Root of the document:

xdoc.Root.Add(xelement);

Answer 4

What's wrong with the simple Add method?