Question

I’m trying to use linq to find MyNode where the name equals Foo, and make a copy of that node and add it to the XML but the new node should have name Bar, and then save the file.

<?xml version="1.0" encoding="utf-8"?>
<MyRoot>
  <MyNode Name="Foo">
    <Data Type="String">ABC</Data>
  </MyNode>
</MyRoot>

this code finds the node

    Dim doc As XDocument = XDocument.Load(xmlFile)
    Dim sheet = From item In doc...<MyRoot>...<MyNode> Select item Where item.@Name = "Foo"

and I’m trying to use this to add the node and change the name.

    sheet.@Name = "Bar" 'After excecuting this, sheet becomes "Nothing"
    doc.Root.Add(sheet.First)
    doc.Save(outFile)

however, after the setting sheet.@Name to “Bar”, then sheet becomes Nothing. If I comment out that line, the output will have two nodes, both named Bar. I suspect I am not doing this the “right way”, in either of terms of changing the attribute or adding this to the XDocument (or both)

Answer 1

c# version (will try to translate)

var doc = XDocument.Load(path);
            var node = doc.Elements("MyRoot").Elements("MyNode").FirstOrDefault(m => m.Attribute("Name").Value == "Foo");
            var newNode = new XElement(node);
            newNode.SetAttributeValue("Name", "Bar");
            doc.Root.Add(newNode);

should be in vb

Dim doc as XDocument = XDocument.Load(xmlFile)
Dim sheet = From item...<MyNode>.FirstOrDefault(Function(m) m.@Name = "Foo")
Dim newSheet As New XElement(sheet)
newSheet.SetAttributeValue("Name", "Bar")
doc.Root.Add(newSheet)