/// <summary>
        /// 应用程序虚拟根目录路径
        /// </summary>
        public static String AppBasePath
        {
            get
            {
                if (HttpContext.Current.Request.ApplicationPath == "/")
                    return "";
                return HttpContext.Current.Request.ApplicationPath;
            }
        }

        /// <summary>
        /// 应用程序物理路径
        /// </summary>
        public static String PhysicalApplicationPath
        {
            get {
                return HttpContext.Current.Request.PhysicalApplicationPath;
            }
        }