Create XML subtree from string in LINQ?

Question

I want to modify all the text nodes using some functions in C#. I want to insert another xml subtree created from some string.

For example, I want to change this

<root>
this is a test
</root>

to

<root>
this is <subtree>another</subtree> test
</root>

I have this piece of code, but it inserts text node, I want to create xml subtree and insert that instead of plain text node.

List<XText> textNodes = element.DescendantNodes().OfType<XText>().ToList();
foreach (XText textNode in textNodes)
{
    String node = System.Text.RegularExpressions.Regex.Replace(textNode.Value, "a", "<subtree>another</subtree>");
    textNode.ReplaceWith(new XText(node));
}

Jonatan Lindén · Accepted Answer · 2009-12-13 20:35:28Z

2

You can split the original XText node into several, and add an XElement in between. Then you replace the original node with the three new nodes.

List<XNode> newNodes = Regex.Split(textNode.Value, "a").Select(p => (XNode) new XText(p)).ToList();

newNodes.Insert(1, new XElement("subtree", "another")); // substitute this with something better

textNode.ReplaceWith(newNodes);

edited Dec 13, 2009 at 20:35

answered Dec 13, 2009 at 15:37

Jonatan Lindén

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5 Comments

Priyank Bolia Over a year ago

there can be many 'a' and 'another' and 'a' are not constant, also value of 'another' depends on value of 'a'. Is there a better solution, where I can just create a subnode from string.

Priyank Bolia Over a year ago

also this is wrong, what if there is no 'a', then also you will insert an 'another' into it.

Priyank Bolia Over a year ago

also this won't compile, as the typecasting won't happen from 'System.Collections.Generic.List<System.Xml.Linq.XText>' to 'System.Collections.Generic.List<System.Xml.Linq.XNode>'

Priyank Bolia Over a year ago

Also I couldn't find the Insert method.

Jonatan Lindén Over a year ago

Yes, insert is not the way to go here (thereby the comment), but it was just to show that you add an XElement to the collection, and then replaces the old node with a collection of new nodes. I had a forgotten a cast, that's why it didn't work, so now it should be ok. And what do you mean that you couldn't find the Insert method? It's a member of the List class.

Priyank Bolia · Accepted Answer · 2009-12-24 15:41:45Z

0

I guess CreateDocumentFragment is much easier, though not LINQ, but the idea to use LINQ is ease only.

answered Dec 24, 2009 at 15:41

Priyank Bolia

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