C# Cache 设定缓存过期时间方法 绝对过期时间 和 相对过期时间(即:访问激活后不过期)

/// <summary>
        /// 设定绝对的过期时间
        /// </summary>
        /// <param name="CacheKey"></param>
        /// <param name="objObject"></param>
        /// <param name="seconds">超过多少秒后过期</param>
        public static void SetCacheDateTime(string CacheKey, object objObject, long Seconds) 
        {
            System.Web.Caching.Cache objCache = HttpRuntime.Cache;
            objCache.Insert(CacheKey, objObject, null, System.DateTime.Now.AddSeconds(Seconds), TimeSpan.Zero);
        }

/// <summary>
        /// 设置当前应用程序指定包含相对过期时间Cache值
        /// </summary>
        /// <param name="CacheKey"></param>
        /// <param name="objObject"></param>
        /// <param name="timeSpan">超过多少时间不调用就失效，单位是秒</param>
        public static void SetCacheTimeSpan(string CacheKey, object objObject,long timeSpan) 
        {
            System.Web.Caching.Cache objCache = HttpRuntime.Cache;
            objCache.Insert(CacheKey, objObject, null, DateTime.MaxValue, TimeSpan.FromSeconds(timeSpan));
        }