How to display, in treeview format, only the folders and subfolders, and the contents of both, that are on the desktop?

Question

Good people, I’d like a little help

I made a file explorer that aims to map all folders, subfolders and files of these folders and subfolders according to the letter that is selected.

The problem is that when selecting any letter, the program shows the folders that start by the selected letter and always shows any files that are not inside a folder, on the desktop. The result looks like this:

The function I used to show the folders and subfolders and the files of both, is this

        var directoryNode = new TreeNode(directoryInfo.Name);
        var directoryNode = new TreeNode(directoryInfo.Name);
        foreach (var directory in directoryInfo.GetDirectories(letra))
        directoryNode.Nodes.Add(CreateDirectoryNode(directory, letra));

        foreach (var file in directoryInfo.GetFiles())
        directoryNode.Nodes.Add(new TreeNode(file.Name));
        return directoryNode;

How can I make so that when selecting the letter, only folders, subfolders and files of both appear ? Thanks for the help

Answer 1

A function is missing before this function you put in your reply. This previous function would only run through desktop folders. Here’s an example, of course, to fit your needs, but basically it would be:

public void SearchDesktopDirectories()
{
    var desktopDirectories = new DirectoryInfo(Environment.GetFolderPath(Environment.SpecialFolder.Desktop));
//aqui já pode fazer a pesquisa pela letra que você quer consultar
    foreach(var desktopDirectory in desktopDirectories.GetDirectories(letra))
    {
        //aqui você percorre apenas as pastas do desktop, passando como parâmetro a letra de pesquisa, e com o retorno insere na sua Tree
        CreateDirectoryNode(desktopDirectory, letra);
    }
}

public void CreateDirectoryNode(DirectoryInfo directoryInfo, string letra)
{
    //aqui dentro segue normal o seu método
    var directoryNode = new TreeNode(directoryInfo.Name);
    foreach (var directory in directoryInfo.GetDirectories(letra))
    directoryNode.Nodes.Add(CreateDirectoryNode(directory, letra));

    foreach (var file in directoryInfo.GetFiles())
    directoryNode.Nodes.Add(new TreeNode(file.Name));
    return directoryNode;
}