Cache 判断Ip几分钟内攻击次数

要做一个防止一个Ip攻击网站的功能,想到了使用Cache,里面有Add  和  Insert方法。方法中有很多参数，他是以key-Value 方式存储，区别在于，Add方法一旦创建，里面的数据不可以修改。Inset 可以key不变修改 value参数。 

  设计思路是这样的，key为ip，value 为次数。代码如下：

 /// <summary>
        /// 获取当前应用程序指定CacheKey的Cache值
        /// </summary>
        /// <param name="CacheKey"></param>
        /// <returns></returns>
        public static object GetCache(string CacheKey)
        {
            System.Web.Caching.Cache objCache = HttpRuntime.Cache;
            return objCache[CacheKey];
        }

        /// <summary>
        /// 设置当前应用程序指定CacheKey的Cache值
        /// </summary>
        /// <param name="CacheKey"></param>
        /// <param name="objObject"></param>
        /// <param name="m">分钟</param>
        public static void SetCache(string CacheKey, object objObject, int m)
        {
            System.Web.Caching.Cache objCache = HttpRuntime.Cache;
            objCache.Insert(CacheKey, objObject, null, DateTime.Now.AddMinutes(m), Cache.NoSlidingExpiration);
        }
        /// <summary>
        /// 
        /// </summary>
        /// <param name="ip"></param>
        /// <param name="duration">时常（分钟）</param>
        /// <param name="count"> 访问量最大阀门值</param>
        /// <returns></returns>
        public static bool IpConfig(string ip, int duration = 1, int count = 10)
        {
            bool result = false;
            string urlIndex = "~/css/IpConfig.xml";
            string FileName = System.Web.HttpContext.Current.Server.MapPath(urlIndex);
            XDocument doc = XDocument.Load(FileName);

            var rel = from p in doc.Descendants("item") where p.Attribute("ip").Value.ToLower() == ip select p;
            result = (rel != null && rel.Count() > 0) ? true : false;
            if (!result)
            {
                object obj = null;
                if (string.IsNullOrWhiteSpace(ip)) { result = true; }
                else
                {
                    obj = GetCache(ip);
                    if (obj != null)
                    {
                        int _count = (int)obj;
                        if (_count >= count)
                        {
                            if (_count == count)
                            {
                                insertIP(ip);
                                sendmobile(ip);
                            }
                            return true;
                        }
                        else
                        {
                            System.Web.Caching.Cache objCache = HttpRuntime.Cache;
                            objCache.Insert(ip, _count + 1, null, DateTime.Now.AddSeconds(duration), Cache.NoSlidingExpiration);
                        }
                    }
                    else
                    {
                        SetCache(ip, 1, duration);
                    }
                }
            }
            return result;
        }

      
        #region 将IP插入到XML中
        public static void insertIP(string ip)
        {
            string urlIndex = "~/css/IpConfig.xml";
            string FileName = System.Web.HttpContext.Current.Server.MapPath(urlIndex);
            XmlDocument xmlDoc = new XmlDocument();
            xmlDoc.Load(FileName);
            XmlNode root = xmlDoc.SelectSingleNode("root");
            XmlNode root0 = root.ChildNodes.Item(0);
            XmlElement xe1 = xmlDoc.CreateElement("item");
            xe1.SetAttribute("ip", ip);

            root0.AppendChild(xe1);
            xmlDoc.Save(FileName);
        }
        #endregion