Two TreeView structure in two Drives

Question

I have a WinForm Application which takes the structure of two TreeViews and implements them as Folders into the path which the users chose in the Drop Down.

The Drop Down currently gets all the chooseable folders from Z:

Now my TreeView loremPath has the right Drive with Z: but ipsumPath should go into R: but with the same Drop Down - Because the second Drive has the exact folder structure as Z: so instead of building a whole new Drop Down, I just need to change the path in ipsumPath to R: and can use one Drop Down for both Treeviews.

So I had a previous Question on StackOverflow and I got recommended to use Hardcoded paths for both TreeViews, but I can't figure out how to implement that.

I tried something like:

        var testPath= new DirectoryInfo("R:\\").GetDirectories();
        var treeSeperator = ipsumPath.PathSeparator;
        var dirSep = Path.DirectorySeparatorChar.ToString();

        foreach (var node in GetCheckedNodes(ipsumPath.Nodes))
        {
            var sPath = Path.Combine(testPath.ToString(), node.FullPath.Replace(treeSeperator, dirSep));
            Directory.CreateDirectory(sPath);
        }

But that didn't work at all.

My whole Code:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Runtime.InteropServices;
using System.IO;
using IWshRuntimeLibrary;
using System.Reflection;

namespace Form1
{
    public partial class Form1 : Form
    {
        [DllImport("Gdi32.dll", EntryPoint = "CreateRoundRectRgn")]
        private static extern IntPtr CreateRoundRectRgn
         (
             int nLeftRect,
             int nTopRect,
             int nRightRect,
             int nBottomRect,
             int nWidthEllipse,
             int nHeightEllipse
         );

        public Form1()
        {
            InitializeComponent();
            this.FormBorderStyle = FormBorderStyle.None;
            Region = System.Drawing.Region.FromHrgn(CreateRoundRectRgn(0, 0, Width, Height, 20, 20));
            foreach (TreeNode tn in loremPath.Nodes)
            {
                tn.Expand();
            }
            foreach (TreeNode tn in ipsumPath.Nodes)
            {
                tn.Expand();
            }
            ipsumDropDown.Items.AddRange(new[] { "R:\\", "Z:\\" });
            loremDropDown.DataSource = new DirectoryInfo($"{ipsumDropDown.SelectedItem}").GetDirectories();
        }

        private void CreateShortcutToCurrentAssembly(string saveDir)
        {
            var testPath = loremDropDown.SelectedValue.ToString();
            WshShell wshShell = new WshShell();
            string fileName = testPath + "\\" + Application.ProductName + ".lnk";
            IWshShortcut shortcut = (IWshShortcut)wshShell.CreateShortcut(fileName);
            shortcut.TargetPath = Application.ExecutablePath;
            shortcut.Save();
        }

        private void close_Click(object sender, EventArgs e)
        {
            System.Windows.Forms.Application.Exit();
        }

        private void loremPath_AfterCheck(object sender, TreeViewEventArgs e)
        {
            if (e.Action == TreeViewAction.Unknown) return;

            foreach (TreeNode n in e.Node.Children())
                n.Checked = e.Node.Checked;

            foreach (TreeNode p in e.Node.Parents())
                p.Checked = p.Nodes.OfType<TreeNode>().Any(n => n.Checked);
        }

        private IEnumerable<TreeNode> GetCheckedNodes(TreeNodeCollection nodeCol)
        {
            foreach (TreeNode node in nodeCol)
            {
                if (node.Checked ||
                    node.Nodes.Cast<TreeNode>().Any(n => n.Checked))
                {
                    yield return node;
                }

                foreach (TreeNode childNode in GetCheckedNodes(node.Nodes))
                {
                    if (childNode.Checked)
                        yield return childNode;
                }
            }
        }
        private void projektordnerGenerieren_Click(object sender, EventArgs e)
        {
            var destPath = loremDropDown.SelectedValue.ToString();
            var treeSep = loremPath.PathSeparator;
            var dirSep = Path.DirectorySeparatorChar.ToString();

            foreach (var node in GetCheckedNodes(loremPath.Nodes))
            {
                var sPath = Path.Combine(destPath, node.FullPath.Replace(treeSep, dirSep));
                Directory.CreateDirectory(sPath);
            }
            foreach (var node in GetCheckedNodes(ipsumPath.Nodes))
            {
                var sPath = Path.Combine(destPath, node.FullPath.Replace(treeSep, dirSep));
                Directory.CreateDirectory(sPath);
            }
            string folder = Environment.GetFolderPath(Environment.SpecialFolder.Desktop);
            CreateShortcutToCurrentAssembly(folder);
        }

        private void textBox1_TextChanged(object sender, EventArgs e)
        {
            this.loremPath.SelectedNode = this.loremPath.Nodes[0];
            this.ipsumPath.SelectedNode = this.ipsumPath.Nodes[0];
            loremPath.SelectedNode.Text = textBox1.Text;
            ipsumPath.SelectedNode.Text = textBox1.Text;
        }

        private void ipsumPath_AfterCheck(object sender, TreeViewEventArgs e)
        {
            if (e.Action == TreeViewAction.Unknown) return;

            foreach (TreeNode n in e.Node.Children())
                n.Checked = e.Node.Checked;

            foreach (TreeNode p in e.Node.Parents())
                p.Checked = p.Nodes.OfType<TreeNode>().Any(n => n.Checked);
        }

        public const int WM_NCLBUTTONDOWN = 0xA1;
        public const int HT_CAPTION = 0x2;

        [System.Runtime.InteropServices.DllImport("user32.dll")]
        public static extern int SendMessage(IntPtr hWnd, int Msg, int wParam, int lParam);
        [System.Runtime.InteropServices.DllImport("user32.dll")]
        public static extern bool ReleaseCapture();

        private void Form1_MouseDown(object sender, System.Windows.Forms.MouseEventArgs e)
        {
            if (e.Button == MouseButtons.Left)
            {
                ReleaseCapture();
                SendMessage(Handle, WM_NCLBUTTONDOWN, HT_CAPTION, 0);
            }
        }

        private void alleErweitern_Click(object sender, EventArgs e)
        {
            foreach (TreeNode tn in loremPath.Nodes)
            {
                tn.Expand();
            }
            foreach (TreeNode tn in ipsumPath.Nodes)
            {
                tn.Expand();
            }
        }

        private void alleReduzieren_Click(object sender, EventArgs e)
        {
            foreach (TreeNode tn in loremPath.Nodes)
            {
                tn.Collapse();
            }
            foreach (TreeNode tn in ipsumPath.Nodes)
            {
                tn.Collapse();
            }
        }

        private void minimize_Click(object sender, EventArgs e)
        {
            this.WindowState = FormWindowState.Minimized;
        }
    }
    static class TreeViewExtensions
    {
        public static IEnumerable<TreeNode> Children(this TreeNode node)
        {
            foreach (TreeNode n in node.Nodes)
            {
                yield return n;

                foreach (TreeNode child in Children(n))
                    yield return child;
            }
        }

        public static IEnumerable<TreeNode> Parents(this TreeNode node)
        {
            var p = node.Parent;

            while (p != null)
            {
                yield return p;

                p = p.Parent;
            }
        }
    }
}

Answer 1

The problem you are trying to solve here is to mirror the checked TreeNode branches in the file system and create similar directory structure in a destination directory. A destination directory can be in one of specific drives such as R: and Z:. So, let's break it down.

Destination Drives

First, you need to list the target drives in list-control such as ComboBox to select one. You can get the fixed and ready drives in your system by the DriveInfo.GetDrives method or by adding them manually if don't want to list them all. I'll use here the later approach. From here, in the designer, drop a ComboBox and name it cmbDrives then add in the form`s constructor:

public Form1()
{
    InitializeComponent();
    // ...

    cmbDrives.Items.AddRange(new[] { "R:\\", "Z:\\" });
    cmbDrives.SelectedIndex = 0;  
}

Destination Directories

You already have the loremDropDown combo box which lists the destination directories/folders. Handle the cmbDrives.SelectedIndexChanged event to populate the destination directories in the selected drive. Revisit the constructor to add:

public Form1()
{
    InitializeComponent();
    // ...

    cmbDrives.Items.AddRange(new[] { "R:\\", "Z:\\" });
    cmbDrives.SelectedIndex = 0; 

    loremDropDown.DisplayMember = "Name";
    loremDropDown.ValueMember = "FullName"; 
}

And add the event handler:

private void cmbDrives_SelectedIndexChanged(object sender, EventArgs e)
{
    var selDrive = cmbDrives.SelectedItem.ToString();
    loremDropDown.DataSource = new DirectoryInfo(selDrive).GetDirectories();
}

Now when you select the R: drive for example, loremDropDown.SelectedValue returns the full path of the selected destination directory like R:\\SomeSelectedDirectory\. When you select another drive like Z:, the path of the same directory will be Z:\\SomeSelectedDirectory\. So you don't need to do anything else.

Create the Directory Structure

Brought from the previous answer:

private void SomeButton_Click(object sender, EventArgs e)
{
    var destPath = loremDropDown.SelectedValue.ToString();
    var treeSep = pathLorem.PathSeparator;
    var dirSep = Path.DirectorySeparatorChar.ToString();

    foreach (var node in GetCheckedNodes(pathLorem.Nodes))
    {
        var sPath = Path.Combine(destPath, node.FullPath.Replace(treeSep, dirSep));
        Directory.CreateDirectory(sPath);
    }

    // The same for `ipsumPath` TreeView if the target destination is the same.
}

private IEnumerable<TreeNode> GetCheckedNodes(TreeNodeCollection nodeCol)
{
    foreach (TreeNode node in nodeCol)
    {
        if (node.Checked ||
            node.Nodes.Cast<TreeNode>().Any(n => n.Checked))
        {
            yield return node;
        }

        foreach (TreeNode childNode in GetCheckedNodes(node.Nodes))
        {
            if (childNode.Checked)
                yield return childNode;
        }
    }
}

---

On the other hand, if you have two TreeView controls and you need to create directory structures in two different drives at the same time where both drives have the same destination directory structure, then you just need to change the drive... (ignore the cmbDrives in this scenario)...

public Form1()
{
    InitializeComponent();
    // ...

    loremDropDown.DisplayMember = "Name";
    loremDropDown.ValueMember = "FullName";
    loremDropDown.DataSource = new DirectoryInfo("F:\\").GetDirectories();
}

private void SomeButton_Click(object sender, EventArgs e)
{
    var driveF = "C:\\";
    var driveZ = "D:\\";
    var selDir = loremDropDown.SelectedValue.ToString();
    var destPathF = selDir.Replace(Path.GetPathRoot(selDir), driveF);
    var destPathZ = selDir.Replace(Path.GetPathRoot(selDir), driveZ);
    var treeSep = pathLorem.PathSeparator;
    var dirSep = Path.DirectorySeparatorChar.ToString();
    var shortcuts = new HashSet<string>();

    foreach (var node in GetCheckedNodes(pathLorem.Nodes))
    {
        var sPath = Path.Combine(destPathF, node.FullPath.Replace(treeSep, dirSep));
        Directory.CreateDirectory(sPath);

        if (node.Level == 0) shortcuts.Add(sPath.TrimStart(driveF.ToArray()));
    }

    foreach (var node in GetCheckedNodes(ipsumPath.Nodes))
    {
        var sPath = Path.Combine(destPathZ, node.FullPath.Replace(treeSep, dirSep));
        Directory.CreateDirectory(sPath);

        if (node.Level == 0) shortcuts.Add(sPath.TrimStart(driveZ.ToArray()));
    }

    foreach (var shortcut in shortcuts)
    {
        var dirF = $"{driveF}{shortcut}";
        var dirZ = $"{driveZ}{shortcut}";

        if (Directory.Exists(dirF) && Directory.Exists(dirZ))
        {
            CreateShortcut(dirF, dirZ);
            CreateShortcut(dirZ, dirF);
        }
    }

    // Optional...
    // CreateShortcut(destPathF, destPathZ);
    // CreateShortcut(destPathZ, destPathF);
}

private void CreateShortcut(string shortcutPath, string targetPath)
{
    WshShell wshShell = new WshShell();
    string fileName = Path.Combine(shortcutPath, $"{Application.ProductName}.lnk");
    IWshShortcut shortcut = (IWshShortcut)wshShell.CreateShortcut(fileName);
    shortcut.TargetPath = targetPath;
    shortcut.Save();
}

Moreover, if it is possible that pathLorem and ipsumPath each of which can output in F: or Z: or somewhere else, then you need to combine the two ideas mentioned here and add two drive selectors (ex. ComboBox) to select from them the destination drive for each instead of hard-coding them. Or, if handling a single TreeView a time is acceptable, then you just need a single cmbDrives combo box and two RadioButton controls to select accordingly pathLorem or ipsumPath control to process.