CODEWITHSUNDEEP
c#.netxmllinq-to-xml
user2837961
user2837961

Reputation: 1555

How can I delete specific nodes from an XElement?

I have created a XElement with node which has XML as below.

I want to remove all the "Rule" nodes if they contain "conditions" node.

I create a for loop as below, but it does not delete my nodes:

foreach (XElement xx in xRelation.Elements())
{
  if (xx.Element("Conditions") != null)
  {
    xx.Remove();
  }
}

Sample:

<Rules effectNode="2" attribute="ability" iteration="1">
    <Rule cause="Cause1" effect="I">
      <Conditions>
        <Condition node="1" type="Internal" />
      </Conditions>
    </Rule>
    <Rule cause="cause2" effect="I">
      <Conditions>
        <Condition node="1" type="External" />
      </Conditions>
    </Rule>
</Rules>

How can I remove all the "Rule" nodes if they contain "conditions" node?

Upvotes: 17

Views: 32501

Answers (6)

Hans
Hans

Reputation: 1

Just an idea:

Reverse the LINQ "condition" and you will get a List without "Rule" nodes.

Upvotes: -1

Kilazur
Kilazur

Reputation: 3188

You can use LINQ:

xRelation.Elements()
     .Where(el => el.Elements("Conditions") == null)
     .Remove();

Or create a copy of the nodes to delete, and delete them after (in case the first method doesn't work):

List nodesToDelete = xRelation
    .Elements()
    .Where(el => el.Elements("Conditions") == null)
    .ToList();

foreach (XElement el in nodesToDeletes)
{
    // Removes from its parent, but not nodesToDelete
    // itself, so we can use foreach here
    el.Remove();
}

Upvotes: 15

user2700757
user2700757

Reputation: 89

  passiveLead.DataXml.Descendants("Conditions").Remove();

This will remove all descendant elements that match the name 'Conditions' for the XML document.

Upvotes: 3

Mihal By
Mihal By

Reputation: 351

var el = xRelation.XPathSelectElement("/Rules/Rule/Conditions");
while (el != null)
{
      el.Remove();
      el = xRelation.XPathSelectElement("/Rules/Rule/Conditions");
}

Upvotes: 1

Andrey Korneyev
Andrey Korneyev

Reputation: 26836

You can try this approach:

var nodes = xRelation.Elements().Where(x => x.Element("Conditions") != null).ToList();

foreach(var node in nodes)
    node.Remove();

Basic idea: you can't delete elements of collection you're currently iterating.
So first you have to create list of nodes to delete and then delete these nodes.

Upvotes: 20

Tomtom
Tomtom

Reputation: 9384

I've made a small example for you:

XDocument document = XDocument.Parse(GetXml());
var rulesNode = document.Element("Rules");
if (rulesNode != null)
{
    rulesNode.Elements("Rule").Where(r => r.Element("Conditions") != null).Remove();
}

Upvotes: 2

Related Questions