httpHelper 从URL获取值的实例代码

/// <summary>          /// 从URL获取值(字符串)          /// </summary>          public static string GetValueFromUrl(string key)          {              string keyvalue = HttpContext.Current.Request.QueryString[key];              if (keyvalue != null)              {                  keyvalue = KillBadString(keyvalue);                    return keyvalue;              }              return "";          }          /// <summary>          /// 从URL获取值(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>          /// 过滤SQL敏感字符          /// </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;          }