static void getAllFileNameInDir(string path, ref List<string> files)
 {
            DirectoryInfo folder = new DirectoryInfo(path);
            Console.WriteLine(path);
            foreach (FileSystemInfo file in folder.GetFileSystemInfos())
            {

                //如果是文件，进行文件的复制操作
                FileInfo fileInfo = file as FileInfo;
                if (fileInfo != null)
                {
                    //获取文件所在原始路径
                    string new_path = path + "\\" + fileInfo.Name;
                    files.Add(new_path);
                }
                else
                {
                    string pp = path + "\\" + file.Name;
                    getAllFileNameInDir(pp, ref files);
                }

            }
 }