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 WindowsFormsTreeView2
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            //添加根节点
            TreeNode tn1 = treeView1.Nodes.Add("组织结构");
            //添加三个子节点
            TreeNode Ntn1 = new TreeNode("C#部门");
            TreeNode Ntn2 = new TreeNode("ASP.NET部门");
            TreeNode Ntn3 = new TreeNode("VB部门");
            tn1.Nodes.Add(Ntn1);
            tn1.Nodes.Add(Ntn2);
            tn1.Nodes.Add(Ntn3);
            //向ImageList中添加两个图像，先通过FromFile实例化成Image对象
            imageList1.Images.Add(Image.FromFile("1.png"));
            imageList1.Images.Add(Image.FromFile("2.png"));
            treeView1.ImageList = imageList1;
            //通过构造方法Size设置图像大小
            imageList1.ImageSize = new Size(16, 16);
            //设置图像索引
            treeView1.ImageIndex = 0;
            //设置某一个被选定节点的图像
            treeView1.SelectedImageIndex = 1;
        }
    }
}