/// <summary>        /// 遞歸獲取文件夾目錄下文件        /// </summary>        /// <param name="pathName">需要遞歸遍歷的文件夾</param>        /// <param name="fileRule">遍歷規則『委托』</param>        public static void LoopFolder(string pathName, Action<FileInfo> fileRule)        {            if (string.IsNullOrEmpty(pathName))                throw new ArgumentNullException(pathName);            Queue<string> _pathQueue = new Queue<string>();            _pathQueue.Enqueue(pathName);            while (_pathQueue.Count > 0)            {                string _path = _pathQueue.Dequeue();                DirectorySecurity _pathSecurity = new DirectorySecurity(_path, accessControlSections.Access);                if (!_pathSecurity.AreAccessRulesPRotected)//文件夾權限是否可訪問                {                    DirectoryInfo _directoryInfo = new DirectoryInfo(_path);                    foreach (DirectoryInfo diChild in _directoryInfo.GetDirectories())                    {                        _pathQueue.Enqueue(diChild.FullName);                    }                    foreach (FileInfo file in _directoryInfo.GetFiles())                    {                        fileRule(file);                    }                }            }        }

舉例使用

                CSharpToolV2.LoopFolder(@"C:/Users/Administrator/Downloads/", (FileInfo file) =>                {                    if (file.Extension.Equals(".xls"))//獲取Excel類型文件                    {                        Console.WriteLine(string.Format("============{0}==============", file.FullName));                    }                });