“Directory is not empty” error when trying to programmatically delete a folder

Question

In my app, I have built a system where users can create picture galleries. Photos held in folders in the format of category_name/gallery_name/{pictures} on disk. Each upload

Answer 1

This works for me, even though i have File Explorer open:

public static void DeleteFilesAndFoldersRecursively(string target_dir)
{
    foreach (string file in Directory.GetFiles(target_dir))
    {
        File.Delete(file);
    }

    foreach (string subDir in Directory.GetDirectories(target_dir))
    {
        DeleteFilesAndFoldersRecursively(subDir);
    }

    Thread.Sleep(1); // This makes the difference between whether it works or not. Sleep(0) is not enough.
    Directory.Delete(target_dir);
}