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/// 
        ///项目预警缓存         /// 
        /// 项目ID        /// 配置字段        /// 
           public static string[] GetWoedBy(string brandid,string strConfig)        {            try            {                string cachekey = "GetWoedBy" + brandid + strConfig;                if (HttpContext.Current.Cache[cachekey] != null)                {                    return (string[])HttpContext.Current.Cache[cachekey];                }                else                {                    string keyword = System.Configuration.ConfigurationManager.AppSettings[strConfig].ToString();                    string[] brandkeyword = keyword.Split(';');                    string[] key = null;                    string[] word = null;                    for (int i = 0; i < brandkeyword.Length; i++)                    {                        if (brandkeyword[i] != "")                        {                            key = brandkeyword[i].Split(':');                            if (key[0] == brandid)                            { word = key[1].Split('/'); }                        }                    }                    HttpContext.Current.Cache.Insert(cachekey, word, null, DateTime.Now.AddDays(7), TimeSpan.Zero);                    return word;                }            }            catch (Exception e)            {                throw;            }        }

提示： [System.NullReferenceException] = {"未将对象引用设置到对象的实例。"}

原因：内存不足时，缓存 Cache 在会自动地移除

解决：将Cache用Application代替：

           HttpContext.Current.Application[cachekey]

/// 
        ///项目预警缓存         /// 
        /// 项目ID        /// 配置字段        /// 
           public static string[] GetWoedBy(string brandid, string strConfig)        {            try            {                string cachekey = "GetWoedBy" + brandid + strConfig;                if (HttpContext.Current.Application[cachekey] != null)                {                    return (string[])HttpContext.Current.Application[cachekey];                }                else                {                    string keyword = System.Configuration.ConfigurationManager.AppSettings[strConfig].ToString();                    string[] brandkeyword = keyword.Split(';');                    string[] key = null;                    string[] word = null;                    for (int i = 0; i < brandkeyword.Length; i++)                    {                        if (brandkeyword[i] != "")                        {                            key = brandkeyword[i].Split(':');                            if (key[0] == brandid)                            { word = key[1].Split('/'); }                        }                    }                    HttpContext.Current.Application.Add(cachekey, word);                    return word;                }            }            catch (Exception e)            {                throw;            }        }

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