httpHelper 從URL擷取值的執行個體代碼

/// <summary>        /// 從URL擷取值(字串)        /// </summary>        public static string GetValueFromUrl(string key)        {            string keyvalue = HttpContext.Current.Request.QueryString[key];            if (keyvalue != null)            {                keyvalue = KillBadString(keyvalue);                return keyvalue;            }            return "";        }        /// <summary>        /// 從URL擷取值(整型)        /// </summary>        /// <param name="key"></param>        /// <returns></returns>        public static int GetIntValueFromUrl(string key)        {            string keyvalue = HttpContext.Current.Request.QueryString[key];            int result = 0;            if (int.TryParse(keyvalue, out result))            {                return result;            }            return result;        }        /// <summary>        /// 過濾SQL敏感字元        /// </summary>        /// <param name="str"></param>        /// <returns></returns>        public static string KillBadString(string str)        {            if (str == null || str.Length == 0)            {                return "";            }            str = System.Text.RegularExpressions.Regex.Replace(str, "'", "''");            return str;        }