/// 
        /// 取得网站的根目录的URL        /// 
        /// 
             public static string GetRootURI()        {            string AppPath = "";            HttpContext HttpCurrent = HttpContext.Current;            HttpRequest Req;            if (HttpCurrent != null)            {                Req = HttpCurrent.Request;                string UrlAuthority = Req.Url.GetLeftPart(UriPartial.Authority);                if (Req.ApplicationPath == null || Req.ApplicationPath == "/")                    //直接安装在   Web   站点                       AppPath = UrlAuthority;                else                    //安装在虚拟子目录下                       AppPath = UrlAuthority + Req.ApplicationPath;            }            return AppPath;        }        /// 
        /// 取得网站的根目录的URL        /// 
        ///         /// 
             public static string GetRootURI(HttpRequest Req)        {            string AppPath = "";            if(Req != null)            {                string UrlAuthority = Req.Url.GetLeftPart(UriPartial.Authority);                if (Req.ApplicationPath == null || Req.ApplicationPath == "/")                    //直接安装在   Web   站点                       AppPath = UrlAuthority;                else                    //安装在虚拟子目录下                       AppPath = UrlAuthority + Req.ApplicationPath;            }            return AppPath;        }        /// 
        /// 取得网站根目录的物理路径        /// 
        /// 
             public static string GetRootPath()        {            string AppPath = "";            HttpContext HttpCurrent = HttpContext.Current;            if (HttpCurrent != null)            {                AppPath = HttpCurrent.Server.MapPath("~");            }            else            {                AppPath = AppDomain.CurrentDomain.BaseDirectory;                if (Regex.Match(AppPath, @"\\$", RegexOptions.Compiled).Success)                    AppPath = AppPath.Substring(0, AppPath.Length - 1);            }            return AppPath;        }