IP address is not showing in a treeview

Question

The IP address is not showing in Treeview.

Here is my XML code:

<?xml version="1.0" standalone="yes"?>
<config>
  <service name="router">
    <ip_address>10.0.3.1</ip_address>
    <action>active</action>
  </service>
  <service name="sname2">
    <ip_address>10.0.3.2</ip_address>
    <weight>4</weight>
    <action>active</action>
  </service>
  <service name="sname3">
    <ip_address>10.0.3.3</ip_address>
    <weight>5</weight>
    <protocol>udp</protocol>
    <action>suspend</action>
  </service>
  <service name="nick">
    <ip_address>10.0.3.93</ip_address>
    <action>active</action>
  </service>
  <owner name="test">
    <content name="rule">
      <vip_address>10.0.3.100</vip_address>
      <protocol>udp</protocol>
      <port>8080</port>
      <add_service>nick</add_service>
      <action>active</action>
    </content>
  </owner>
</config>

In treeview, the IP address is not showing. I am loading from an XML file, so here is my code and screen. What is this issue?

using System.Xml;
using System.IO;

namespace howto_load_treeview_from_xml
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            string filename = Application.StartupPath;
            filename = System.IO.Path.Combine(filename, "..\\..");
            filename = Path.GetFullPath(filename) + "\\test.xml";
            LoadTreeViewFromXmlFile(filename, trvItems);
        }

        // Load a TreeView control from an XML file.
        private void LoadTreeViewFromXmlFile(string filename, TreeView trv)
        {
            // Load the XML document.
            XmlDocument xml_doc = new XmlDocument();
            xml_doc.Load(filename);

            // Add the root node's children to the TreeView.
            trv.Nodes.Clear();
            AddTreeViewChildNodes(trv.Nodes, xml_doc.DocumentElement);
        }

        // Add the children of this XML node
        // to this child nodes collection.
        private void AddTreeViewChildNodes(TreeNodeCollection parent_nodes, XmlNode xml_node)
        {
            foreach (XmlNode child_node in xml_node.ChildNodes)
            {
                // Make the new TreeView node.
                TreeNode new_node = parent_nodes.Add(child_node.Name);

                // Recursively make this node's descendants.
                AddTreeViewChildNodes(new_node.Nodes, child_node);

                // If this is a leaf node, make sure it's visible.
                if (new_node.Nodes.Count == 0) new_node.EnsureVisible();
            }
         }
      }
   }

Answer 1

Those bunch of #text get displayed in the treeview, because you're using Name property of text nodes as the treeview node name.

To get the actual value of the text nodes displayed, use Value property instead. Something like this (untested codes):

private void AddTreeViewChildNodes(TreeNodeCollection parent_nodes, XmlNode xml_node)
{
    foreach (XmlNode child_node in xml_node.ChildNodes)
    {
        var isTextNode = child_node.NodeType == XmlNodeType.Text;
        var treeNodeName = isTextNode ? child_node.Value : child_node.Name;
        
        // Make the new TreeView node.
        TreeNode new_node = parent_nodes.Add(treeNodeName);
        
        // Recursively make this node's descendants.
        AddTreeViewChildNodes(new_node.Nodes, child_node);
        
        // If this is a leaf node, make sure it's visible.
        if(new_node.Nodes.Count == 0) new_node.EnsureVisible();
    }
 }