C#获取当前页面的URL地址

#region 获取页面地址
        /// <summary>
        /// 获取页面地址
        /// </summary>
        /// <returns></returns>
        public static string GetUrl()
        {
            string strTemp = "http://";
            if (System.Web.HttpContext.Current.Request.ServerVariables["HTTPS"] == "off")
            {
                strTemp = "http://";
            }
            else
            {
                strTemp = "https://";
            }

            strTemp = strTemp + System.Web.HttpContext.Current.Request.ServerVariables["SERVER_NAME"];

            if (System.Web.HttpContext.Current.Request.ServerVariables["SERVER_PORT"] != "80")
            {
                strTemp = strTemp + ":" + System.Web.HttpContext.Current.Request.ServerVariables["SERVER_PORT"];
            }

            strTemp = strTemp + System.Web.HttpContext.Current.Request.ServerVariables["URL"];

            if (System.Web.HttpContext.Current.Request.QueryString.AllKeys.Length > 0)
            {
                strTemp = strTemp + "?" + System.Web.HttpContext.Current.Request.QueryString;
            }

            return strTemp;
        }
        #endregion