C# TreeView SampleCode

[창공]

// https://youtu.be/m2Uc_d_dVdU

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using System.Windows.Forms;

namespace TreeViewCode

{

    public partial class Form1 : Form

    {

        public Form1()

        {

            InitializeComponent();

        }

        private void Form1_Load(object sender, EventArgs e)

        {

            label1.Text = "Node : " + GetTotalNodes(treeView1) ;

        }

        private int GetTotalNodes(TreeView treeView)

        {

            return GetChildNodesCount(treeView.Nodes) ;

        }

        private int GetChildNodesCount(TreeNodeCollection nodes)

        {

            int nodeC = nodes.Count ;

            foreach(TreeNode node in nodes)

            {

                nodeC += GetChildNodesCount(node.Nodes) ;

            }

            return nodeC ;

        }

        private void button1_Click(object sender, EventArgs e)

        {

            if(treeView1.Nodes[0].IsExpanded)

                treeView1.CollapseAll();

            else

                treeView1.ExpandAll();

        }

        private void button2_Click(object sender, EventArgs e)

        {

            if(treeView1.SelectedNode==null) return ;

            if(treeView1.SelectedNode.IsExpanded)

                treeView1.SelectedNode.Collapse();

            else

                treeView1.SelectedNode.Expand();

        }

        private void button3_Click(object sender, EventArgs e)

        {   // Node Add

            if(treeView1.SelectedNode==null) return ;

            string nName = "Node" + GetTotalNodes(treeView1) ;

            TreeNode newNode = new TreeNode(nName);

            treeView1.SelectedNode.Nodes.Add(newNode);

            treeView1.SelectedNode.Expand();

            label1.Text = "Node : " + GetTotalNodes(treeView1) ;

        }

        private void button4_Click(object sender, EventArgs e)

        {   // Node Remove

            if(treeView1.SelectedNode==null) return ;

            treeView1.Nodes.Remove(treeView1.SelectedNode);

            label1.Text = "Node : " + GetTotalNodes(treeView1) ;

        }

        TreeNode searchNode=null;

        private void button5_Click(object sender, EventArgs e)

        {

            searchNode=null;

            SearchChildNodes(treeView1.Nodes, textBox1.Text) ;

            if(searchNode==null) return ;

            treeView1.SelectedNode = searchNode ;            

            treeView1.Focus();

        }

        private void SearchChildNodes(TreeNodeCollection nodes, string name)

        {

            if(searchNode!=null) return ;

            foreach(TreeNode node in nodes)

            {

                if(name==node.Text)

                {

                    searchNode = node ;

                    return ;

                }

                SearchChildNodes(node.Nodes, name);

            }

        }

        private void treeView1_NodeMouseClick(object sender, TreeNodeMouseClickEventArgs e)

        {   // currently selected

            if(treeView1.SelectedNode==null) return ;

            // previously selected node text is displayed...

            label2.Text = treeView1.SelectedNode.Text;

        }

        private void treeView1_AfterSelect(object sender, TreeViewEventArgs e)

        {   // after select

            if(treeView1.SelectedNode==null) return ;

            label2.Text = treeView1.SelectedNode.Text;

        }

    }

}