/// <summary>
        /// 刪除單個檔案
        /// </summary>
        /// <param name="_filepath">檔案相對路徑</param>
        public static bool DeleteFile(string _filepath)
        {
            if (string.IsNullOrEmpty(_filepath))
            {
                return false;
            }
            string
 
 fullpath = GetMapPath(_filepath);
            if (File.Exists(fullpath))
            {
                File.Delete(fullpath);
                return true;
            }
            return false;
        }

        /// <summary>
        /// 刪除上傳的檔案(及縮圖)
        /// </summary>
        /// <param name="_filepath">
 
</param>
        public static void DeleteUpFile(string _filepath)
        {
            if (string.IsNullOrEmpty(_filepath))
            {
                return;
            }
            string fullpath = GetMapPath(_filepath); //原圖
            if (File.Exists(fullpath))
            {
                File.Delete(fullpath);
            }
            if
 
 (_filepath.LastIndexOf("/") >= 0)
            {
                string thumbnailpath = _filepath.Substring(0, _filepath.LastIndexOf("/")) + "mall_" + _filepath.Substring(_filepath.LastIndexOf("/") + 1);
                string fullTPATH = GetMapPath(thumbnailpath); //宿略圖
                if (File.Exists(fullTPATH))
                {
                    File.Delete(fullTPATH);
                }
            }
        }

        /// <summary>
        /// 刪除內容圖片
        /// </summary>
        /// <param name="content">內容</param>
        /// <param name="startstr">匹配開頭字串</param>
        public static void DeleteContentPic(string content, string startstr)
        {
            if (string.IsNullOrEmpty(content))
            {
                return;
            }
            Regex reg = new Regex("IMG[^>]*?src\\s*=\\s*(?:\"(?<1>[^\"]*)\"|'(?<1>[^\']*)')", RegexOptions.IgnoreCase);
            MatchCollection m = reg.Matches(content);
            foreach (Match math in m)
            {
                string imgUrl = math.Groups[1].Value;
                string fullPath = GetMapPath(imgUrl);
                try
                {
                    if (imgUrl.ToLower().StartsWith(startstr.ToLower()) && File.Exists(fullPath))
                    {
                        File.Delete(fullPath);
                    }
                }
                catch { }
            }
        }

        /// <summary>
        /// 刪除指定資料夾
        /// </summary>
        /// <param name="_dirpath">檔案相對路徑</param>
        public static bool DeleteDirectory(string _dirpath)
        {
            if (string.IsNullOrEmpty(_dirpath))
            {
                return false;
            }
            string fullpath = GetMapPath(_dirpath);
            if (Directory.Exists(fullpath))
            {
                Directory.Delete(fullpath, true);
                return true;
            }
            return false;
        }

        /// <summary>
        /// 修改指定資料夾名稱
        /// </summary>
        /// <param name="old_dirpath">舊相對路徑</param>
        /// <param name="new_dirpath">新相對路徑</param>
        /// <returns>bool</returns>
        public static bool MoveDirectory(string old_dirpath, string new_dirpath)
        {
            if (string.IsNullOrEmpty(old_dirpath))
            {
                return false;
            }
            string fulloldpath = GetMapPath(old_dirpath);
            string fullnewpath = GetMapPath(new_dirpath);
            if (Directory.Exists(fulloldpath))
            {
                Directory.Move(fulloldpath, fullnewpath);
                return true;
            }
            return false;
        }

        /// <summary>
        /// 返回檔案大小KB
        /// </summary>
        /// <param name="_filepath">檔案相對路徑</param>
        /// <returns>int</returns>
        public static int GetFileSize(string _filepath)
        {
            if (string.IsNullOrEmpty(_filepath))
            {
                return 0;
            }
            string fullpath = GetMapPath(_filepath);
            if (File.Exists(fullpath))
            {
                FileInfo fileInfo = new FileInfo(fullpath);
                return ((int)fileInfo.Length) / 1024;
            }
            return 0;
        }

        /// <summary>
        /// 返回副檔名，不含“.”
        /// </summary>
        /// <param name="_filepath">檔案全名稱</param>
        /// <returns>string</returns>
        public static string GetFileExt(string _filepath)
        {
            if (string.IsNullOrEmpty(_filepath))
            {
                return "";
            }
            if (_filepath.LastIndexOf(".") > 0)
            {
                return _filepath.Substring(_filepath.LastIndexOf(".") + 1); //副檔名，不含“.”
            }
            return "";
        }

        /// <summary>
        /// 返回檔名，不含路徑
        /// </summary>
        /// <param name="_filepath">檔案相對路徑</param>
        /// <returns>string</returns>
        public static string GetFileName(string _filepath)
        {
            return _filepath.Substring(_filepath.LastIndexOf(@"/") + 1);
        }

        /// <summary>
        /// 檔案是否存在
        /// </summary>
        /// <param name="_filepath">檔案相對路徑</param>
        /// <returns>bool</returns>
        public static bool FileExists(string _filepath)
        {
            string fullpath = GetMapPath(_filepath);
            if (File.Exists(fullpath))
            {
                return true;
            }
            return false;
        }

        /// <summary>
        /// 獲得遠端字串
        /// </summary>
        public static string GetDomainStr(string key, string uriPath)
        {
            string result = CacheHelper.Get(key) as string;
            if (result == null)
            {
                System.Net.WebClient client = new System.Net.WebClient();
                try
                {
                    client.Encoding = System.Text.Encoding.UTF8;
                    result = client.DownloadString(uriPath);
                }
                catch
                {
                    result = "暫時無法連線!";
                }
                CacheHelper.Insert(key, result, 60);
            }

            return result;
        }

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