深层目录文件复制，C# 递归，录音录像图片文件过多，用于测试程序

/// <summary>
        /// 录音录像图片文件过多只复制目录的前几个文件，用于测试程序
        /// d:file/images/2019-10/01/01/xxxxx.jpg（前几个文件）
        /// 复制到
        /// E:file/images/2019-10/01/01/xxxxx.jpg
        /// 
        /// copyfiles("d:file","e:file");
        /// </summary>
        /// <param name="path">源目录</param>
        /// <param name="toPath">目的目录</param>
        /// <param name="Num">文件个数</param>
        public static void CopyFiles(string path,string toPath,int Num)
        {
            var logger = NLog.LogManager.GetCurrentClassLogger();
            DirectoryInfo dir = new DirectoryInfo(path);
            DirectoryInfo[] childs = dir.GetDirectories();
            string newdirStr;
            if (dir.Name.IndexOf(':') == -1)
            {
                DirectoryInfo newdir = Directory.CreateDirectory(toPath + "\" + dir.Name);
                newdirStr = newdir.FullName;
            }
            else
            {
                newdirStr = toPath;
            }
            if (childs.Length>0)
            {
                foreach (var child in childs)
                {
                    if ((child.Attributes & FileAttributes.Hidden) == FileAttributes.Hidden)
                    {
                        continue;
                    }
                    CopyFiles(child.FullName, newdirStr, Num);
                }
            }
            else
            {
                dir.GetFiles().Take(Num).ToList().ForEach(f => {
                    string newfilename = newdirStr + "\" + f.Name;
                    File.Copy(f.FullName, newfilename, true);
                    logger.Info($"复制文件:{f.FullName}");
                    logger.Info($"复制文件:{newfilename}");
                });
            }
        }