Removing Nodes from an Xmldocument

Removing nodes from an XmlDocument

Instead of

configDoc.RemoveChild(projectNodes[i]);

try

projectNodes[i].parentNode.RemoveChild(projectNodes[i]);

Remove node from xmlDocument

The RemoveChild method working on direct child of the node. you are trying to remove some inner (not first generation) node by accessing the root node - the document.
The trick here is to get the parent node and remove the child from it.

child.ParentNode.RemoveChild(child)

Read an XML document and removing nodes

Using Xml Linq :

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Xml;
using System.Xml.Linq;
namespace XML
{
    class Program
    {
        const string FILENAME = @"c:\temp\test.xml";
        static void Main(string[] args)
        {
            XDocument doc = XDocument.Load(FILENAME);

            XElement EmpDetail = doc.Descendants("EmpDetail").Where(x => (int)x.Element("RecordId") == 2).FirstOrDefault();

            EmpDetail.Remove();

        }
    }
}

Removing a child node from XmlNode

You can get know the parent node:

node.ParentNode.RemoveChild(node);

Please note that the node.ParentNode can be null.

Remove an XML element based on child index

In your case looping XmlNodeList not required.

try this

XmlDocument doc = new XmlDocument();
            doc.Load(path);

            if (ListView1.SelectedIndex < doc.DocumentElement.ChildNodes.Count)
            {
                doc.DocumentElement.RemoveChild(doc.DocumentElement.ChildNodes[ListView1.SelectedIndex]);
                doc.Save(path);
            }

How to remove a XMLNode from XMLDocument occuring at multiple nested levels

As you indicated that you are working with an XmlDocument, you need to remove a child XmlElement node via the RemoveChild method on the parent node:

    string xml = @"<?xml version=""1.0"" encoding=""UTF-8""?>
        <books>
            <book>
                <title>The Walking Dead</title>
                <author>Test Name</author>
                <isbn>1239859895</isbn>
            </book>
            <book>
                <title>The Walking Dead</title>
                <author>
                    <isbn>29893893893</isbn>
                    <firstname>test1</firstname>
                    <lastname>test</lastname>
                </author>
            </book>        
        </books>
        ";
    // Initialize and load the XmlDocument
    var doc = new XmlDocument();
    doc.LoadXml(xml);

    // Delete all XmlElements named "isbn".
    var list = doc.DocumentElement.GetElementsByTagName("isbn").OfType<XmlElement>().ToArray();
    foreach (var element in list)
    {
        var parent = element.ParentNode;
        if (parent != null)
            parent.RemoveChild(element);
    }
    var newXml = doc.OuterXml;
    Debug.WriteLine(newXml);

And the output is:

<?xml version="1.0" encoding="utf-16"?>
<books>
  <book>
    <title>The Walking Dead</title>
    <author>Test Name</author>
  </book>
  <book>
    <title>The Walking Dead</title>
    <author>
      <firstname>test1</firstname>
      <lastname>test</lastname>
    </author>
  </book>
</books>

Remove node from xmlDoc, how to delete the parentNode?

I think your issue is the XmlNode.RemoveAll() only removing the children of the node and the chkNode.ParentNode property is selecting the node with the <Set> tag. So when you remove all children, you are left with an empty <Set/> node. You need to be able to remove that specific node as well.

To adapt your existing method, you need to do something like:

foreach (XmlNode chkNode in nodes)
{                
    string currentName = "Test 1";
    if (!nameDict.ContainsKey(currentName))
    {
        XmlNode parent = chkNode.ParentNode;
        parent.ParentNode.RemoveChild(parent);
    }
}

Of course, I can't test this as-is since I am not sure what exactly nameDict and nodes are.

For the sake of completeness, this code will break if chkNode or chkNode.ParentNode are XmlNodes that cannot have parents (such as a Attribute, Document, DocumentFragment, Entity, Notation nodes). If you think this is a possible scenario, you might want to include the appropriate null checks or wrap this method in a try-catch

Something like:

XmlNode parent = chkNode.ParentNode;
if (parent != null && parent.ParentNode != null)
    parent.ParentNode.RemoveChild(parent);

Or:

try
{
    XmlNode parent = chkNode.ParentNode;
    parent.ParentNode.RemoveChild(parent);
}
catch (NullReferenceException ex)
{
    // do something with exception
}

There are several options with LINQ to accomplish what you want in a better way, but since you are using C#2.0, this solution should get you in the right direction.

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