c# - Cache Code

来源：互联网发布：项目管理系统源码编辑：程序博客网时间：2024/05/17 21:58
/// <summary>        /// Get item using cachem, will refresh cache after 1 day.        /// </summary>        /// <typeparam name="T">Type of item to get</typeparam>        /// <param name="cacheKey">Cache key</param>        /// <param name="function">Function to get the item if not available in cache</param>        /// <returns>Retrieved object</returns>        public static T UsingCache<T>(string cacheKey, Func<T> function)        {            object cachedObject = null;            if (HttpContext.Current != null)            {                cachedObject = HttpContext.Current.Cache.Get(cacheKey);            }            else            {                cachedObject = MemoryCache.Default.Get(cacheKey);            }            if (cachedObject != null)            {                if (cachedObject == DBNull.Value)                {                    return default(T);                }                try                {                    return (T) cachedObject;                }                catch                {                    // In this case continue and get result from function                }            }            T result = function();            if (HttpContext.Current != null)            {                HttpContext.Current.Cache.Add(cacheKey,                     (object) result ?? DBNull.Value,                     new CacheDependency(HttpContext.Current.Server.MapPath("~/bin")),                     DateTime.Now.AddDays(1),                     TimeSpan.Zero,                     System.Web.Caching.CacheItemPriority.Default,                     null);            }            else            {                MemoryCache.Default.Add(                    cacheKey,                    (object) result ?? DBNull.Value,                    new CacheItemPolicy()                    {                        AbsoluteExpiration = new DateTimeOffset(DateTime.Now.AddDays(1))                    });            }            return result;        }
0 0