Question

I have several XDocuments that look like:

<Test>
  <element
      location=".\jnk.txt"
      status="(modified)"/>
 <element
     location=".\jnk.xml"
     status="(overload)"/>
</Test>

In C#, I create a new XDocument:

XDocument mergedXmlDocs = new XDocument(new XElement("ACResponse"));

And try to add the nodes from the other XDocuments:

for (ti = 0; (ti < 3); ++ti)
{
    var query = from xElem in xDocs[(int)ti].Descendants("element")
        select new XElement(xElem);

    foreach (XElement xElem in query)
    { 
        mergedXmlDocs.Add(xElem);
    }
}

At runtime I get an error about how the Add would create a badly-formed document.
What am I doing wrong?
Thanks…

(I saw this question — Merge XML documents — but creating an XSLT transform seemed like extra trouble for what seems like a simple operation.)

Answer 1

You are very close. Trying changing the line

mergedXmlDocs.Add(xElem);

to

mergedXmlDocs.Root.Add(xElem);

The problem is that each XML document can only contain 1 root node. Your existing code is trying to add all of the nodes at the root level. You need to add them to the existing top level node instead.