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 WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            FolderBrowserDialog dlg = new FolderBrowserDialog();
            if (dlg.ShowDialog() != DialogResult.OK)
            {
                return;
            }
            
            textBox1.Text = dlg.SelectedPath;
            listBox1.Items.Clear();
            Stack<Tuple<string, int>> stack = new Stack<Tuple<string, int>>();
            stack.Push(new Tuple<string, int>(dlg.SelectedPath, 0));

            while (stack.Count > 0)
            {
                var temp = stack.Pop();
                var dir = temp.Item1;
                var rank = temp.Item2;

                listBox1.Items.Add(
                    new String(' ', rank * 2) +
                    Path.GetFileName(dir) + "[フォルダ]");

                var subfs = Directory.GetFiles(dir, "*");
                foreach (var f in subfs)
                {
                    listBox1.Items.Add(
                        new String(' ', (rank + 1) * 2) +
                        Path.GetFileName(f) + "[ファイル]");
                }
                if (subfs.Length > 0)
                {
                    listBox1.Items.Add("");
                }

                var subds = Directory.GetDirectories(dir, "*");
                foreach (var d in subds)
                {
                    stack.Push(new Tuple<string, int>(d, rank + 1));
                }
            }
        }
    }
}