treeView和递归的简单运用

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using
System;

using
System.Collections.Generic;

using
System.ComponentModel;

using
System.Data;

using
System.Drawing;

using
System.IO;

using
System.Linq;

using
System.Text;

using
System.Threading.Tasks;

using
System.Windows.Forms;

namespace
treeview

{

    public
partial class
Form1 : Form

    {

        public
Form1()

        {

            InitializeComponent();

        }

        private
void Form1_Load(object
sender, EventArgs e)

        {

            string
path = @"F:\demo";

            LoadDirectoryAndFile(treeView1.Nodes,path);

        }

        private
void LoadDirectoryAndFile(TreeNodeCollection tnc, string
path)

        {

            //获取文件夹

           string[] dirs = Directory.GetDirectories(path);

           for
(int
i = 0; i < dirs.Length; i++)

           {

              TreeNode tn = tnc.Add(Path.GetFileName(dirs[i]));

              LoadDirectoryAndFile(tn.Nodes, dirs[i]);//递归遍历

           }

            //获取文件

           string[] files = Directory.GetFiles(path,"*.txt"); //只加载.txt

           for
(int
i = 0; i < files.Length; i++)

           {

              TreeNode tn1 = tnc.Add(Path.GetFileName(files[i]));

               ////Tag:可以存任何东西，在这里存的是文本文件的路径，因为文件夹不需要显示在文本框中

              tn1.Tag = files[i];

           }

        }

        private
void treeView1_NodeMouseDoubleClick(object
sender, TreeNodeMouseClickEventArgs e)

        {

            if
(treeView1.SelectedNode.Tag != null)

            {

                textBox1.Text = File.ReadAllText(treeView1.SelectedNode.Tag.ToString(), Encoding.Default);

            }

        }

    }

}