前言

一、效果

二、界面设计

三、代码

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace 自练1
{
    public partial class treeview控件 : Form
    {
        public treeview控件()
        {
            InitializeComponent();

            TreeNode RootNode1 = new TreeNode("根节点1");
            TreeNode RootNode2 = new TreeNode("根节点2");
            TreeNode ChildNode1 = new TreeNode("子节点1");
            TreeNode ChildNode2 = new TreeNode("子节点2");
            TreeNode ChildNode1_1 = new TreeNode("子节点1_1");
            TreeNode ChildNode1_2 = new TreeNode("子节点1_2");

            treeView1.Nodes.Add(RootNode1);
            treeView1.Nodes.Add(RootNode2);
            RootNode1.Nodes.AddRange(new TreeNode[] { ChildNode1, ChildNode2 });
            ChildNode1.Nodes.AddRange(new TreeNode[] { ChildNode1_1, ChildNode1_2 });

            
        }

        private void button1_Click(object sender, EventArgs e)
        {
            
            MessageBox.Show("hello,world","弹出的对话框");
        }

        private void button2_Click(object sender, EventArgs e)
        {
            Application.Exit();
        }

        private void treeview控件_FormClosing(object sender, FormClosingEventArgs e)
        {
            DialogResult choice = MessageBox.Show("确定要关闭窗体吗？", "注意", MessageBoxButtons.OKCancel, MessageBoxIcon.Question);

            if (choice == DialogResult.Cancel)   //判断是否单击“取消按钮”
            {
                e.Cancel = true;
            }
        }
    }

    public class MessageFilter : System.Windows.Forms.IMessageFilter     //禁止窗体拖动的类，继承自System.Windows.Forms.IMessageFilter 接口
    {
        const int WM_NCLBUTTONDOWN = 0x00A1;
        const int HTCAPTION = 2;


        public bool PreFilterMessage(ref System.Windows.Forms.Message m)
        {
            if (m.Msg == WM_NCLBUTTONDOWN && m.WParam.ToInt32() == HTCAPTION)
                return true;
            return false;
        }
    }
}

总结