c#_xml_to_treeview

using System;
using System.IO;
using System.Windows.Forms;
using System.Drawing;
using System.Xml;

namespace XmlToTreeview
{
    public class Form1 : Form
    {
        TreeView treeView1 = new TreeView();
        Boolean expanded = true;

        public static void Main(string[] args)
        {
            try
            {
                Application.Run(new Form1());
            }
            catch (Exception e)
            {
                Console.WriteLine(e.Message);
            }
        }

        // https://pastebin.com/PGVHnWqs
        /*
        https://ourcodeworld.com/articles/read/913/how-to-render-a-xml-file-string-into-a-treeview-component-in-winforms-with-csharp
        https://stackoverflow.com/questions/8503521/populating-treeview-from-xml
        https://stackoverflow.com/questions/28491166/parse-xml-to-treeview-list
        http://www.thescarms.com/dotnet/XMLTreeview.aspx
        */

        public Form1()
        {
            FileStream fs = new FileStream(@"xml_to_treeview.xml", FileMode.Open, FileAccess.Read);

            Size = new Size(300, 600);
            Text = fs.Name;

            Controls.Add(treeView1);
            treeView1.Dock = DockStyle.Fill;
            treeView1.NodeMouseDoubleClick += new TreeNodeMouseClickEventHandler(TreeView1NodeMouseDoubleClick);

            XmlDocument xmlDoc = new XmlDocument();
            XmlNode xmlnode;

            xmlDoc.Load(fs);
            xmlnode = xmlDoc.ChildNodes[1];


            treeView1.Nodes.Clear();
            treeView1.Nodes.Add(new TreeNode(xmlDoc.DocumentElement.Name));

            AddNode(xmlnode, treeView1.Nodes[treeView1.Nodes.Count - 1]);

            fs.Close();
        }

        private void AddNode(XmlNode inXmlNode, TreeNode inTreeNode)
        {
            // Attribútumok listázása:
            if (inXmlNode.Attributes != null)
            {
                foreach (XmlAttribute attrib in inXmlNode.Attributes)
                {
                    inTreeNode.Nodes.Add(new TreeNode("[ " + attrib.Name + "= '" + attrib.Value + "' ]"));
                }
            }

            // Elemek listázása:
            // Az '... || inXmlNode.InnerText.Trim().Equals("") ' nélkül az üres elem tartalma, azaz a "" felülírja az elem nevét a fában!
            if (inXmlNode.HasChildNodes || inXmlNode.InnerText.Trim().Equals(""))
            {
                foreach (XmlNode xxNode in inXmlNode.ChildNodes)
                {
                    inTreeNode.Nodes.Add(new TreeNode(xxNode.Name));
                    AddNode(xxNode, inTreeNode.Nodes[inTreeNode.Nodes.Count - 1]);
                }
            }
            else
            {
                inTreeNode.Text = "'" + inXmlNode.InnerText.ToString() + "'";
            }
        }

        private void TreeView1NodeMouseDoubleClick(object sender, TreeNodeMouseClickEventArgs e)
        {
            treeView1.BeginUpdate();
            if (expanded)
            {
                treeView1.CollapseAll();
                expanded = false;
            }
            else
            {
                treeView1.ExpandAll();
                expanded = true;
            }
            treeView1.EndUpdate();
        }
    }
}