muskafidi_pract_gl4/Form10.cs

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

namespace WindowsFormsApp19
{
    public partial class Form10 : Form
    {
        int koef = 1;
        public Form10()
        {
            InitializeComponent();
            treeView1.BeforeSelect += treeView1_BeforeSelect;
            treeView1.BeforeExpand += treeView1_BeforeExpand;
            // заполняем дерево дисками
            FillDriveNodes();
            trackBar1.Scroll += trackBar1_Scroll;
            this.Width = 400;
            button1.Width = 40;
            button1.Left = 40;
            button1.Text = "";
            button1.BackColor = Color.Aqua;

            timer1.Interval = 500; // 500 миллисекунд
            timer1.Enabled = true;
            button1.Click += button1_Click;
            timer1.Tick += timer1_Tick;
        }

        private void Form10_Load(object sender, EventArgs e)
        {

        }
        void treeView1_BeforeExpand(object sender, TreeViewCancelEventArgs e)
        {
            e.Node.Nodes.Clear();
            string[] dirs;
            try
            {
                if (Directory.Exists(e.Node.FullPath))
                {
                    dirs = Directory.GetDirectories(e.Node.FullPath);
                    if (dirs.Length != 0)
                    {
                        for (int i = 0; i < dirs.Length; i++)
                        {
                            TreeNode dirNode = new TreeNode(new DirectoryInfo(dirs[i]).Name);
                            FillTreeNode(dirNode, dirs[i]);
                            e.Node.Nodes.Add(dirNode);
                        }
                    }
                }
            }
            catch (Exception ex) { }
        }
        // событие перед выделением узла
        void treeView1_BeforeSelect(object sender, TreeViewCancelEventArgs e)
        {
            e.Node.Nodes.Clear();
            string[] dirs;
            try
            {
                if (Directory.Exists(e.Node.FullPath))
                {
                    dirs = Directory.GetDirectories(e.Node.FullPath);
                    if (dirs.Length != 0)
                    {
                        for (int i = 0; i < dirs.Length; i++)
                        {
                            TreeNode dirNode = new TreeNode(new DirectoryInfo(dirs[i]).Name);
                            FillTreeNode(dirNode, dirs[i]);
                            e.Node.Nodes.Add(dirNode);
                        }
                    }
                }
            }
            catch (Exception ex) { }
        }

        // получаем все диски на компьютере
        private void FillDriveNodes()
        {
            try
            {
                foreach (DriveInfo drive in DriveInfo.GetDrives())
                {
                    TreeNode driveNode = new TreeNode { Text = drive.Name };
                    FillTreeNode(driveNode, drive.Name);
                    treeView1.Nodes.Add(driveNode);
                }
            }
            catch (Exception ex) { }
        }
        // получаем дочерние узлы для определенного узла
        private void FillTreeNode(TreeNode driveNode, string path)
        {
            try
            {
                string[] dirs = Directory.GetDirectories(path);
                foreach (string dir in dirs)
                {
                    TreeNode dirNode = new TreeNode();
                    dirNode.Text = dir.Remove(0, dir.LastIndexOf("\\") + 1);
                    driveNode.Nodes.Add(dirNode);
                }
            }
            catch (Exception ex) { }
        }

        private void trackBar1_Scroll(object sender, EventArgs e)
        {
            label1.Text = String.Format("Текущее значение: {0}", trackBar1.Value);
        }

        private void timer1_Tick(object sender, EventArgs e)
        {
            progressBar1.PerformStep();
            if (button1.Left == (this.Width - button1.Width - 10))
            {
                koef = -1;
            }
            else if (button1.Left == 0)
            {
                koef = 1;
            }
            button1.Left += 10 * koef;
        }

        // обработчик нажатия на кнопку
        void button1_Click(object sender, EventArgs e)
        {
            if (timer1.Enabled == true)
            {
                timer1.Stop();
            }
            else
            {
                timer1.Start();
            }
        }

        private void button1_Click_1(object sender, EventArgs e)
        {

        }

        private void button2_Click(object sender, EventArgs e)
        {
            Form11 frm11 = new Form11();
            frm11.Show();
        }
    }
}