在C＃中读取复杂的XML文件（Unity3d）

Question

I'm having big trouble reading an XML Document with c# in Unity. The XML I'm trying to read has a structure like this:

<Classes A>
 <Class A></Class A>
 <Class A></Class A>
  <Class A></Class A>
   <Class A>
    <Detail X>
    <Detail Y>
   </Class A>
   <Class A>
   (...)

Sometimes, Class A has children; sometimes, Class A is a child of another Class A etc.

I've been trying and researching for 2 days, however I can't manage to understand how to read this using System.XML or System.XML.Linq

I'm able to read all the Elements and their Attributes using XDocument.Read(), however I'm not able to get any information on whether they're inherited by another class or have children themselves. How can I read an Element and then have it check whether there are any children and if

a) there are children, continue to read the children

or

b) there are no children, continue to read the next Element.

I understand that XNodes presumably contain the information I want. I'm able to read all of the XNodes, too. But I'm not able to cast any XNode to an XElement or vice versa. None of the functions behave as I'd expect.

Answer 1

Sample XML

<?xml version="1.0" encoding="utf-8" ?>
<Classes A="1">
  <Class A="1.1"/>
  <Class A="1.2">
    <Detail X="1.2.1"/>
  </Class>
  <Class A="1.3">
    <Detail X="1.3.1"/>
    <Detail Y="1.3.2"/>
  </Class>
  <Class A="1.4"/>
</Classes>

C# Code

        public void XMLToTreeView()
        {
            var reader = XmlReader.Create(@"Path\Sample.xml");
            var xElement = XElement.Load(reader);
            reader.Close();
            findAllNodes(xElement, treeView1);
        }

        private void findAllNodes(XElement xElement, TreeView treeView)
        {
            TreeNode ParentNode = treeView.Nodes.Add(xElement.Attributes().FirstOrDefault().Value);
            foreach (XElement childElement in xElement.Elements())
            {
                TreeNode node = new TreeNode();
                node.Text = childElement.Attributes().FirstOrDefault().Value;
                ParentNode.Nodes.Add(node);
                findAllNodes(childElement, node);
            }
        }

        private void findAllNodes(XElement xElement, TreeNode node)
        {
            foreach (XElement childElement in xElement.Elements())
            {
                TreeNode childNode = new TreeNode();
                childNode.Text = childElement.Attributes().FirstOrDefault().Value;
                node.Nodes.Add(childNode);
                findAllNodes(childElement, childNode);
            }
        }