/// 
        /// 裁剪图片 返回服务器保存的路径        /// 
        ///         ///         ///         ///         ///         /// 文件名        /// 保存路径        /// 
             public static string ImgCut(Bitmap bit, int startX, int startY, int iWidth, int iHeight, string filename = "1.jpeg", string dirpath = "图片保存目录")        {            var img = Cut(bit, startX, startY, iWidth, iHeight);            if (!Directory.Exists(HttpContext.Current.Server.MapPath(dirpath)))            {                Directory.CreateDirectory(HttpContext.Current.Server.MapPath(dirpath));            }            var filepath = dirpath + "/" + filename;            img.Save(HttpContext.Current.Server.MapPath(filepath), ImageFormat.Jpeg);            img.Clone();            img.Dispose();            return filepath;        }