.net 缓存之应用程序数据缓存

CaCheHelp类中代码如下：

        #region 根据键从缓存中读取保持的数据
        /// <summary>
        /// 根据键从缓存中读取保持的数据
        /// </summary>
        /// <param name="CaCheKey">索引键值</param>
        /// <returns></returns>
        public static object GetCaChe(string CaCheKey)
        {
            System.Web.Caching.Cache ca = HttpRuntime.Cache;
            return ca[CaCheKey];
        } 
        #endregion

        #region 设置当前应用程序中指定的缓存项
        /// <summary>
        /// 设置当前应用程序中指定的缓存项
        /// </summary>
        /// <param name="CaCheKey">索引键值</param>
        /// <param name="objValue">缓存对象</param>
        public static void SetCaChe(string CaCheKey, object objValue)
        {
            System.Web.Caching.Cache ca = HttpRuntime.Cache;
            ca.Insert(CaCheKey, objValue);
        } 
        #endregion

        #region 设置当前应用程序中指定的缓存项  重载
        /// <summary>
        /// 设置当前应用程序中指定的缓存项  重载
        /// </summary>
        /// <param name="CaCheKey">索引键值</param>
        /// <param name="objValue">缓存对象</param>
        /// <param name="ab">绝对过期时间</param>
        /// <param name="sp">最后一次访问所插入对象时与该对象过期时之间的时间间隔<</param>
        public static void SetCaChe(string CaCheKey, object objValue, DateTime ab, TimeSpan sp)
        {
            System.Web.Caching.Cache ca = HttpRuntime.Cache;
            ca.Insert(CaCheKey, objValue, null, ab, sp);
        } 
        #endregion

页面调用代码：

string CaCheKey = "cachekey";
            object objModel = CaCheHelp.GetCaChe(CaCheKey);
            if (objModel == null)
            {
                objModel = DateTime.Now; //缓存对象：当前系统时间
                if (objModel != null)
                {
                    int CaCheTime = 5; //五秒
                    CaCheHelp.SetCaChe(CaCheKey, objModel, DateTime.Now.AddSeconds(CaCheTime), TimeSpan.Zero);
                }
            }
            
            lable_time.InnerText = objModel.ToString();