How do I get the upper level name of an xelement?

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I have an xml file that I am building. I am trying to copy/clone (whatever you want to call it) one element to the end. Here is a quick view:

XML

<VDZ>
  <Transformer>
    <Tx>
      <Handle>1</Handle>
      <ID>TBA</ID>
      <Rating>200kVA</Rating>
      <Z>0.03444</Z>
      <Points>
        <P ID="0" X="120" Y="96" />
      </Points>
    </Tx>
  </Transformer>
</VDZ>

I am using a LINQ query to get the element based on the Handle Element, like such :

VB

Dim query = (From p In xml_Proj.Descendants()
                            Where p.Element("Handle") = ActiveHandle
                            Select p).FirstOrDefault

So I have query, but how do I clone/copy it? I need to know it came from the Transformer element and I want to add another one at the end. I have tried using the below but I am getting null.

Dim root As XElement = query.Parent

How can I get the name of the descendant and place a copy of the element under it? Thanks.

What I have tried:

I have tried as mentioned above

Posted 21-Mar-20 14:07pm

Brett Hyland

Updated 22-Mar-20 3:14am

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Maciej Los 22-Mar-20 8:57am

What exactly do you want to copy? Tx or Transformer node?
Please, provide example output.

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Maciej Los · Answer 1 · 2020-03-22T03:15:00

Not sure, what you want to achieve, but take a look at below code:

VB.NET

Dim xcontent As String  = "<VDZ>
  <Transformer>
    <Tx>
      <Handle>1</Handle>
      <ID>TBA</ID>
      <Rating>200kVA</Rating>
      <Z>0.03444</Z>
      <Points>
        <P ID='0' X='120' Y='96' />
      </Points>
    </Tx>
  </Transformer>
</VDZ>"

Dim xdoc AS XDocument = XDocument.Parse(xcontent)
Dim secondTransformer As XElement = New XElement(xdoc.Descendants("Transformer").FirstOrDefault())
Dim h As XElement = secondTransformer.Descendants("Handle").FirstOrDefault()
h.Value = 2
xdoc.Root.Add(secondTransformer)
'new node hase been added!