PsGet.Abstractions.PhysicalFileSystem.GetAllFiles C# (CSharp) Method

        private IEnumerable<IEnumerable<string>> GetAllFiles(string dir)
        {
            foreach (var subdir in Directory.EnumerateDirectories(dir))
            {
                yield return GetAllFiles(subdir).SelectMany(s => s);
            }
            yield return Directory.EnumerateFiles(dir).Select(f =>
                (f.StartsWith(_root) ? f.Substring(_root.Length) : f).TrimStart('\\'));
        }