获取请求Url

        /// <summary>

        /// 获取请求Url

        /// 例：http://www.text:1234

        /// </summary>

        /// <returns></returns>

        public string GetRequestUrl()

        {

            return string.Format("{0}://{1}", HttpContext.Current.Request.Url.Scheme,

                HttpContext.Current.Request.ServerVariables["HTTP_HOST"]);

        }