实现

System.IO.DirectoryInfo dir = new System.IO.DirectoryInfo("指定路径");
System.IO.DirectoryInfo[] subDirs = dir.GetDirectories();
foreach(System.IO.DirectoryInfo subDir in subDirs)
   {
      node = new DataTreeNode();
      node.Id = subDir.FullName;
      node.NodeText = subDir.Name;
      node.CreateDate = String.Format("{0:yyyy-MM-dd HH:mm:ss}", subDir.CreationTime);
      
    }