在C# 获取当前应用网址

 /// <summary>
        /// 获取当前应用网址
        /// </summary>
        /// <returns></returns>
        public static String GetCurApplicationUrl()
        {
            String url = HttpContext.Current.Request.Url.IsDefaultPort
                ? HttpContext.Current.Request.Url.Host
                : string.Format("{0}:{1}", HttpContext.Current.Request.Url.Host, HttpContext.Current.Request.Url.Port.ToString());
            if (HttpContext.Current.Request.ApplicationPath != "/")
                return "http://" + url + HttpContext.Current.Request.ApplicationPath;
            else return "http://" + url;
        }