// get the FULL paths of all directories and files under a specific directory
public static void GetDirsAndFiles(this IDirectoryManager manager,
string rootFullPath, out IEnumerable <string> dirs, out IEnumerable <string> files)
{
try
{
dirs = manager.GetDirectories(rootFullPath);
files = manager.GetFiles(rootFullPath);
}
catch (Exception ex)
{
dirs = null; files = null;
throw new ApplicationException($"Cannot get dorectory info in \"{rootFullPath}\"", ex);
}
}