/// 
        /// 解析相对Url        /// 
        /// 相对Url        public static string ResolveUrl(string relativeUrl)        {            if (string.IsNullOrWhiteSpace(relativeUrl))                return string.Empty;            relativeUrl = relativeUrl.Replace("\\", "/");            if (relativeUrl.StartsWith("/"))                return relativeUrl;            if (relativeUrl.Contains("://"))                return relativeUrl;            return VirtualPathUtility.ToAbsolute(relativeUrl);        }