文件批量 复制 粘贴 删除 格式限定

        /// <summary>        /// 处理指定工作方式，只工作指定文件类型        /// </summary>        /// <param name="workWhat">[工作方式]目前支持 复制 剪切 删除</param>        /// <param name="fromDir">[来自]</param>        /// <param name="toDir">[到]</param>        /// <param name="extension">工作文件扩展名</param>        private void copyDir(string workWhat, string fromDir, string toDir, string extension)        {            string[] files = Directory.GetFiles(@fromDir);            foreach (string file in files)            {                FileInfo fiE = new FileInfo(@file);                //loading文本说明 赋值                if (workWhat == "copy")                {                    if (fiE.Extension == extension)                    {                        File.Copy(@file, @toDir + "\\" + Path.GetFileName(@file), true);                    }                }                else if (workWhat == "paste")                {                    if (fiE.Extension == extension)                    {                        File.Move(@file, @toDir + "\\" + Path.GetFileName(@file));                    }                }                else if (workWhat == "delete")                {                    if (fiE.Extension == extension)                    {                        File.Delete(@file);                    }                }            }            //子目录处理            string[] dirs = Directory.GetDirectories(@fromDir);            foreach (string dir in dirs)            {                if (!Directory.Exists(@toDir + "\\" + Path.GetFileName(@dir)))                {                    Directory.CreateDirectory(@toDir + "\\" + Path.GetFileName(@dir));                }                copyDir(workWhat, fromDir, @toDir + "\\" + Path.GetFileName(@dir), extension);            }            //使用            //copyDir("复制", @"D:\", @"E:\receive", ".txt");            //copyDir("剪切", @"D:\", @"E:\receive" , ".txt");            //copyDir("删除", @"D:\", string.Empty, ".txt");        }