运行效果.jpg

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;
using System.IO;

namespace TreeViewExample
{
    public partial class TreeViewExampleForm : Form
    {
        public TreeViewExampleForm()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            string path = @"E:\学习开发文件夹";
            LoadDirectoryAndFile(path, LeftTreeView.Nodes);
        }
        //将找到的文件夹和文件添加到节点上
        private void LoadDirectoryAndFile(string path,TreeNodeCollection tc)
        {
            //获得当前这一目录下所有文件夹的全路径
            string[] dics = Directory.GetDirectories(path);
            for (int i = 0; i < dics.Length; i++)
            {
                //从文件夹的全路径中截取出文件夹的名称
                string dicName = Path.GetFileNameWithoutExtension(dics[i]);
                //将文件夹的名称添加到节点集合下，返回新添加的节点
                TreeNode tn = tc.Add(dicName);
                //递归调用自己继续将下级文件夹添加到当前节点下
                LoadDirectoryAndFile(dics[i],tn.Nodes);
            }
            //获得当前文件夹下所有文件的全路径
            string[] fileNames = Directory.GetFiles(path);
            for (int i = 0; i < fileNames.Length; i++)
            {
                //从文件的全路径中截取出文件的名称
                string fileName = Path.GetFileNameWithoutExtension(fileNames[i]);
                TreeNode tn =  tc.Add(fileName);
                tn.Tag = fileNames[i];
            }
        }

        private void LeftTreeView_MouseDoubleClick(object sender, MouseEventArgs e)
        {
            //获得选中的节点
            string filePath = LeftTreeView.SelectedNode.Tag.ToString();
            RighttTextBox.Text = File.ReadAllText(filePath, Encoding.Default);
        }
    }
}