XmlDocument vs XDocument Example and comparison

suggest change
There are several ways interact with an Xml file.
  1. Xml Document
  2. XDocument
  3. XmlReader/XmlWriter

Before LINQ to XML we were used XMLDocument for manipulations in XML > like adding attributes, elements and so on. Now LINQ to XML uses > XDocument for the same kind of thing. Syntaxes are much easier than > XMLDocument and it requires a minimal amount of code.

Also XDocument is mutch faster as XmlDocument. XmlDoucument is an old > and dirty solution for query an XML document.

I am going to show some examples of XmlDocument class and XDocument class class:

Load XML file
string filename = @"C:\temp\test.xml";

XmlDocument

XmlDocument _doc = new XmlDocument();
_doc.Load(filename);

XDocument

XDocument _doc = XDocument.Load(fileName);
Create XmlDocument

XmlDocument

XmlDocument doc = new XmlDocument();
XmlElement root = doc.CreateElement("root");
root.SetAttribute("name", "value");
XmlElement child = doc.CreateElement("child");
child.InnerText = "text node";
root.AppendChild(child);
doc.AppendChild(root);

XDocument

XDocument doc = new XDocument(
    new XElement("Root", new XAttribute("name", "value"), 
    new XElement("Child", "text node"))
);
/*result*/
<root name="value">
    <child>"TextNode"</child>
</root>
Change InnerText of node in XML

XmlDocument

XmlNode node = _doc.SelectSingleNode("xmlRootNode");
node.InnerText = value;

XDocument

XElement rootNote = _doc.XPathSelectElement("xmlRootNode"); 
rootNode.Value = "New Value";
Save File after edit

Make sure to safe the xml after any change.

// Safe XmlDocument and XDocument
_doc.Save(filename);
Retreive Values from XML

XmlDocument

XmlNode node = _doc.SelectSingleNode("xmlRootNode/levelOneChildNode");
string text = node.InnerText;

XDocument

XElement node = _doc.XPathSelectElement("xmlRootNode/levelOneChildNode");
 string text = node.Value;
Retreive value from all from all child elements where attribute = something.

XmlDocument

List<string> valueList = new List<string>(); 
    foreach (XmlNode n in nodelist)
    {
        if(n.Attributes["type"].InnerText == "City")
        {
            valueList.Add(n.Attributes["type"].InnerText);
        }
    }

XDocument

var accounts = _doc.XPathSelectElements("/data/summary/account").Where(c => c.Attribute("type").Value == "setting").Select(c => c.Value);
Append a node

XmlDocument

XmlNode nodeToAppend = doc.CreateElement("SecondLevelNode");
nodeToAppend.InnerText = "This title is created by code";

/* Append node to parent */
XmlNode firstNode= _doc.SelectSingleNode("xmlRootNode/levelOneChildNode");
firstNode.AppendChild(nodeToAppend);

/*After a change make sure to safe the document*/
_doc.Save(fileName);

XDocument

_doc.XPathSelectElement("ServerManagerSettings/TcpSocket").Add(new XElement("SecondLevelNode"));

 /*After a change make sure to safe the document*/
_doc.Save(fileName);

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