在C＃中下载目录

Question

我想从云端下载文件夹/目录，现在我只能下载文件。

我如何下载和目录？

代码：

        void Update()
    {
        string url = "url/file.txt";

        if(!string.IsNullOrEmpty(url))
        {
            Thread threat = new Thread(() =>
            {
                Uri uri = new Uri(url);
                string filename = Path.GetFileName(uri.AbsolutePath);
                client.DownloadFileAsync(uri, File.ReadAllText(Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments) + @"\Astro And Aliens Launcher\GameFilesPath.txt") + "/" + filename);
            });
            threat.Start();
        }
    }

    private void Client_DownloadFileCompleted(object sender, AsyncCompletedEventArgs e)
    {
        MessageBox.Show("Update Complete!", "Message", MessageBoxButton.OK, MessageBoxImage.Information);
    }

    private void Client_DownloadProgressChanged(object sender, DownloadProgressChangedEventArgs e)
    {
        Dispatcher.Invoke(new System.Windows.Forms.MethodInvoker(delegate ()
        {
            UpdateProgress.Minimum = 0;
            double receive = double.Parse(e.BytesReceived.ToString());
            double total = double.Parse(e.TotalBytesToReceive.ToString());
            double percentage = receive / total * 100;
            updatePercentText.Content = $"Downloaded {string.Format("{0:0.##}", percentage)}%";
            UpdateProgress.Value = int.Parse(Math.Truncate(percentage).ToString());
        }));
    }