(C#) Removing / Deleting Child Nodes from XML

Demonstrates various methods for removing child nodes from an XML document.

The input XML, available at http://www.chilkatsoft.com/data/fruit.xml, is this:

<root>
    <fruit color="red">apple</fruit>
    <fruit color="green">pear</fruit>
    <veg color="orange">carrot</veg>
    <meat animal="cow">beef</meat>
    <xyz>
        <fruit color="blue">blueberry</fruit>
        <veg color="green">broccoli</veg>
    </xyz>
    <fruit color="purple">grape</fruit>
    <cheese color="yellow">cheddar</cheese>
</root>

Download: Chilkat .NET Assemblies

Chilkat.Xml xml = new Chilkat.Xml();
Chilkat.Xml xyz = null;

bool success;
//  The sample input XML is available at http://www.chilkatsoft.com/data/fruit.xml
success = xml.LoadXmlFile("fruit.xml");
if (success != true) {
    textBox1.Text += xml.LastErrorText + "\r\n";
    return;
}

//  The RemoveChild method removes (discards) all direct
//  children having the specified tag:
xml.RemoveChild("fruit");

//  Show the resulting XML:
textBox1.Text += "Result with all direct children having a tag equal to \"fruit\" removed:" + "\r\n";
textBox1.Text += xml.GetXml() + "\r\n";

//  The XML with the "fruit" direct children removed is shown below:
//  Notice that the "fruit" node beneath "xyz" was not removed.
//  This correct because it was not a direct child of the calling node.
//  
<root>
    <veg color="orange">carrot</veg>
    <meat animal="cow">beef</meat>
    <xyz>
        <fruit color="blue">blueberry</fruit>
        <veg color="green">broccoli</veg>
    </xyz>
    <cheese color="yellow">cheddar</cheese>
</root>


//  --------------------------------------------------------------------------
//  Restore the original XML:
success = xml.LoadXmlFile("fruit.xml");

//  The RemoveChildWithContent method removes the child
//  having the exact content specified, regardless of the tag.
//  For example:
xml.RemoveChildWithContent("pear");

//  Show the resulting XML:
textBox1.Text += "Result with the node containing \"pear\" removed:" + "\r\n";
textBox1.Text += xml.GetXml() + "\r\n";

//  --------------------------------------------------------------------------
//  Restore the original XML:
success = xml.LoadXmlFile("fruit.xml");

//  The RemoveChildByIndex method removes the Nth direct
//  child.  Indexing begins at 0.  The "xyz" child is at index 4:
xml.RemoveChildByIndex(4);

//  Show the resulting XML:
//  Notice that the entire "xyz" subtree is removed.
textBox1.Text += "Result with the node at index 4 removed:" + "\r\n";
textBox1.Text += xml.GetXml() + "\r\n";

//  --------------------------------------------------------------------------
//  Restore the original XML:
success = xml.LoadXmlFile("fruit.xml");

//  Navigate to the node with tag "xyz"
xyz = xml.FindChild("xyz");

//  Remove the "xyz" subtree making it it's own XML document
//  with the "xyz" node at the root:
xyz.RemoveFromTree();

//  Show both XML documents:
textBox1.Text += xyz.GetXml() + "\r\n";
textBox1.Text += xml.GetXml() + "\r\n";

//  Also, the TreeId property is an integer value assigned
//  to nodes in an XML document.  All nodes belonging to
//  the same XML document will have the same TreeId.
//  Notice that the "xyz" node now has a different TreeId:
textBox1.Text += "xyz TreeId = " + xyz.TreeId + "\r\n";
textBox1.Text += "xml TreeId = " + xml.TreeId + "\r\n";