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    /// <summary>    /// 內(nèi)存緩存幫助類，支持絕對過期時(shí)間、滑動(dòng)過期時(shí)間、文件依賴三種緩存方式。    /// </summary>    class MemoryCacheHelper    {        private static readonly object _locker1 = new object(), _locker2 = new object();        /// <summary>        /// 取緩存項(xiàng)，如果不存在則返回空。        /// </summary>        /// <typeparam name="T"></typeparam>        /// <param name="key"></param>        /// <returns></returns>        public static T GetCacheItem<T>(string key)        {            try            {                return (T)MemoryCache.Default[key];            }            catch            {                return default(T);            }        }        /// <summary>        /// 是否包含指定鍵的緩存項(xiàng)        /// </summary>        /// <param name="key"></param>        /// <returns></returns>        public static bool Contains(string key)        {            return MemoryCache.Default.Contains(key);        }        /// <summary>        /// 取緩存項(xiàng)，如果不存在則新增緩存項(xiàng)。        /// </summary>        /// <typeparam name="T"></typeparam>        /// <param name="key"></param>        /// <param name="cachePopulate"></param>        /// <param name="slidingExpiration"></param>        /// <param name="absoluteExpiration"></param>        /// <returns></returns>        public static T GetOrAddCacheItem<T>(string key, Func<T> cachePopulate, TimeSpan? slidingExpiration = null, DateTime? absoluteExpiration = null)        {            if (string.IsNullOrWhiteSpace(key)) throw new ArgumentException("Invalid cache key");            if (cachePopulate == null) throw new ArgumentNullException("cachePopulate");            if (slidingExpiration == null && absoluteExpiration == null) throw new ArgumentException("Either a sliding expiration or absolute must be provided");            if (MemoryCache.Default[key] == null)            {                lock (_locker1)                {                    if (MemoryCache.Default[key] == null)                    {                        T cacheValue = cachePopulate();                        if (!typeof(T).IsValueType && cacheValue == null)   //如果是引用類型且為NULL則不存緩存                        {                            return cacheValue;                        }                        var item = new CacheItem(key, cacheValue);                        var policy = CreatePolicy(slidingExpiration, absoluteExpiration);                        MemoryCache.Default.Add(item, policy);                    }                }            }            return (T)MemoryCache.Default[key];        }        /// <summary>        /// 取緩存項(xiàng)，如果不存在則新增緩存項(xiàng)。        /// </summary>        /// <typeparam name="T"></typeparam>        /// <param name="key"></param>        /// <param name="cachePopulate"></param>        /// <param name="dependencyFilePath"></param>        /// <returns></returns>        public static T GetOrAddCacheItem<T>(string key, Func<T> cachePopulate, string dependencyFilePath)        {            if (string.IsNullOrWhiteSpace(key)) throw new ArgumentException("Invalid cache key");            if (cachePopulate == null) throw new ArgumentNullException("cachePopulate");            if (MemoryCache.Default[key] == null)            {                lock (_locker2)                {                    if (MemoryCache.Default[key] == null)                    {                        T cacheValue = cachePopulate();                        if (!typeof(T).IsValueType && cacheValue == null)   //如果是引用類型且為NULL則不存緩存                        {                            return cacheValue;                        }                        var item = new CacheItem(key, cacheValue);                        var policy = CreatePolicy(dependencyFilePath);                        MemoryCache.Default.Add(item, policy);                    }                }            }            return (T)MemoryCache.Default[key];        }        /// <summary>        /// 指定緩存項(xiàng)的一組逐出和過期詳細(xì)信息        /// </summary>        /// <param name="slidingExpiration"></param>        /// <param name="absoluteExpiration"></param>        /// <returns></returns>        private static CacheItemPolicy CreatePolicy(TimeSpan? slidingExpiration, DateTime? absoluteExpiration)        {            var policy = new CacheItemPolicy();            if (absoluteExpiration.HasValue)            {                policy.AbsoluteExpiration = absoluteExpiration.Value;            }            else if (slidingExpiration.HasValue)            {                policy.SlidingExpiration = slidingExpiration.Value;            }            policy.Priority = CacheItemPriority.Default;            return policy;        }        /// <summary>        /// 指定緩存項(xiàng)的一組逐出和過期詳細(xì)信息        /// </summary>        /// <param name="filePath"></param>        /// <returns></returns>        private static CacheItemPolicy CreatePolicy(string filePath)        {            CacheItemPolicy policy = new CacheItemPolicy();            policy.ChangeMonitors.Add(new HostFileChangeMonitor(new List<string>() { filePath }));            policy.Priority = CacheItemPriority.Default;            return policy;        }        /// <summary>        /// 移除指定鍵的緩存項(xiàng)        /// </summary>        /// <param name="key"></param>        public static void RemoveCacheItem(string key)        {            if (Contains(key))            {                MemoryCache.Default.Remove(key);            }        }    }

    /// <summary>    /// Unity容器幫助類    /// </summary>    public static class UnityHelper    {        /// <summary>        /// Unity容器創(chuàng)建對象(不含別名)        /// </summary>        /// <param name="containerName">容器名稱</param>        /// <returns></returns>        public static T GetObject<T>(string containerName)        {            IUnityContainer container = MemoryCacheHelper.GetOrAddCacheItem(containerName, () =>            {                IUnityContainer unityContainer = new UnityContainer();                ExeConfigurationFileMap fileMap = new ExeConfigurationFileMap                {                    ExeConfigFilename = Path.Combine(AppDomain.CurrentDomain.BaseDirectory + @"ConfigFiles\Unity.config")                };                Configuration configuration = ConfigurationManager.OpenMappedExeConfiguration(fileMap, ConfigurationUserLevel.None);                UnityConfigurationSection configSection = (UnityConfigurationSection)configuration.GetSection(UnityConfigurationSection.SectionName);                configSection.Configure(unityContainer, containerName);                return unityContainer;            },TimeSpan.FromMinutes(30),null);                        return container.Resolve<T>();        }        /// <summary>        /// Unity容器創(chuàng)建對象(含別名)        /// </summary>        /// <typeparam name="T"></typeparam>        /// <param name="containerName">容器名稱</param>        /// <param name="alisName">對象別名</param>        /// <returns></returns>        public static T GetObject<T>(string containerName, string alisName)        {            IUnityContainer container = MemoryCacheHelper.GetOrAddCacheItem(containerName, () =>            {                IUnityContainer unityContainer = new UnityContainer();                ExeConfigurationFileMap fileMap = new ExeConfigurationFileMap                {                    ExeConfigFilename = Path.Combine(AppDomain.CurrentDomain.BaseDirectory + @"ConfigFiles\Unity.config")                };                Configuration configuration = ConfigurationManager.OpenMappedExeConfiguration(fileMap, ConfigurationUserLevel.None);                UnityConfigurationSection configSection = (UnityConfigurationSection)configuration.GetSection(UnityConfigurationSection.SectionName);                configSection.Configure(unityContainer, containerName);                return unityContainer;            }, TimeSpan.FromMinutes(30), null);            return container.Resolve<T>(alisName);        }    }