c#樹控制元件treeview_新增treenode節點_選中顯示_刪除

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Data.OracleClient; //引入oracle的連線物件名稱空間


namespace learncomboxanddatagridview
{
    public partial class Form1 : Form
    {
        
        public Form1()
        {
            InitializeComponent();
        }
       
        //窗體載入事件
        private void Form1_Load(object sender, EventArgs e)
        {
            //初始化樹控制元件的節點層次結構 共計新增二層樹狀節點結構
            TreeNode tn1 = treeView1.Nodes.Add("科藍公司");
            TreeNode tn2 = treeView1.Nodes.Add("華為");
            TreeNode tn1sub1 = tn1.Nodes.Add("專案管理部");
            TreeNode tn1sub2 = tn1.Nodes.Add("技術管理部");
            TreeNode tn2sub1 = tn2.Nodes.Add("海外部");
            TreeNode tn2sub2 = tn2.Nodes.Add("國內部");
        }

        //選中樹控制元件treeview不同節點後發生,經測試用afterselect可提取選中節點資訊
        private void treeView1_AfterSelect(object sender, TreeViewEventArgs e)
        {
            this.textBox1.Text ="當前選中的節點是："+ e.Node.Text;
        }

        //測試刪除樹控制元件節點
        private void button1_Click(object sender, EventArgs e)
        {
            try
            {
                if ((treeView1.SelectedNode.Text == "科藍公司") || (treeView1.SelectedNode.Text == "華為"))
                {
                    MessageBox.Show("請選擇其子節點進行刪除");
                }
                //remove為刪除樹控制元件節點方法
                treeView1.Nodes.Remove(treeView1.SelectedNode);
                MessageBox.Show("刪除節點成功");
            }
            //學習異常處理模組try catch
            catch (Exception x)
            {
                //彈出異常資訊,不至於讓程式執行中斷，可繼續執行
                MessageBox.Show(x.Message);
                //呼叫窗體載入事件重新初始化樹控制元件
                Form1_Load(sender,e);
            }
        }

    }
}