[RESOLVED] List Directory and Files inside a TreeView

[mbegley]

I'm trying to code a TreeView that lists directory structure and files inside the TreeView, itself. There is no ListView. What is needed is a tree whose root is a directory instead of a drive. Everything I try either breaks the code, or doesn't produce the desired effect.

UPDATE 10/26/10: The following code has been corrected, and now works:

using System;
using System.IO;
using System.Windows.Forms;

namespace WindowsFormsApplication3
{
    public partial class Form1 : Form
    {
        [STAThread]
        static void Main()
        {
            Application.Run(new Form1());
        }        
        public Form1()
        {
            InitializeComponent();
            PopulateTreeView();            
        }
        private void PopulateTreeView()            
        {           
            TreeNode rootNode;           
            DirectoryInfo rootFolder = new DirectoryInfo(@"c:\TEST");
            if (rootFolder.Exists)
            {
                rootNode = new TreeNode(rootFolder.Name);
                rootNode.Tag = rootFolder;
                GetDirectories(rootFolder.GetDirectories(), rootNode);
                AddFiles(rootFolder, rootNode);
                treeView1.Nodes.Add(rootNode);

            }
        }
        private void GetDirectories(DirectoryInfo[] Dirs, TreeNode parentNode)
        {           
            TreeNode dNode;
            DirectoryInfo[] subDirs;
            foreach (DirectoryInfo Di in Dirs)
            {
                dNode = new TreeNode(Di.Name, 0, 0);
                dNode.Tag = Di;
                dNode.ImageKey = "folder";
                
                subDirs = Di.GetDirectories();
                if (subDirs.Length != 0)
                {
                    GetDirectories(subDirs, dNode);
                }
                parentNode.Nodes.Add(dNode);
                AddFiles(Di, dNode);               
            }            
        }
        private void AddFiles(DirectoryInfo Di, TreeNode dNode)
        {
            {
                FileInfo[] fis = Di.GetFiles();
                foreach (FileInfo fi in fis)
                {
                    TreeNode fNode = new TreeNode(fi.Name);
                    fNode.ImageKey = "File.ico";
                    dNode.Nodes.Add(fNode);
                }
            }
        }
    }
}

[Millig]

Your second version doesn't pick up the files in each directory. Add the following method:

void AddFiles(TreeNode dNode, DirectoryInfo Di)
{
FileInfo[] fis = Di.GetFiles();
foreach (FileInfo fi in fis)
{
TreeNode fNode = new TreeNode(fi.Name);
dNode.Nodes.Add(fNode);
}
}

Call that method for the root folder in PopulateTreeView() and each sub directory in GetDirectories() and you will get the display that you describe.

[mbegley]

@ Millig... Your method works perfectly. I tried many times to write that method, but kept getting it wrong. (I was using DirectoryInfo[] as a formal parameter ). I updated the code snippet to show the correct method in case anyone else has the same problem. Thank you for your help.