.net 服务端缓存 Cache/CacheHelper
服务端缓存公共类
/// <summary> /// 公共缓存类 /// </summary> public static class CacheHelper { private static ObjectCache cache = MemoryCache.Default; /// <summary> /// 查询缓存是否存在 /// </summary> /// <param name="key">缓存键</param> /// <returns>是否存在</returns> public static bool ExistsCache(string key) { return cache.Contains(key); } /// <summary> /// 根据缓存键移除缓存对象 /// </summary> /// <typeparam name="T">对象类型</typeparam> /// <param name="key">缓存键</param> public static void RemoveCache(string key) { if (!cache.Contains(key)) return; cache.Remove(key); } /// <summary> /// 设置缓存对象 /// </summary> /// <typeparam name="T">对象类型</typeparam> /// <param name="key">缓存键</param> /// <param name="obj">缓存对象</param> /// <param name="expires">过期时间(单位:分钟)</param> public static void SetCache<T>(string key, T obj, double expires = 20) where T : class { CacheItemPolicy policy = new CacheItemPolicy() { AbsoluteExpiration = DateTimeOffset.Now.AddMinutes(expires) }; cache.Set(key, obj, policy); } /// <summary> /// 根据缓存键获取缓存对象 /// </summary> /// <typeparam name="T">对象类型</typeparam> /// <param name="key">缓存键</param> /// <returns>缓存对象</returns> public static T GetCache<T>(string key) where T : class { if (!cache.Contains(key)) return null; var item = cache.GetCacheItem(key); if (item != null) { return item.Value as T; } return null; } /// <summary> /// 获取缓存对象,如果不存在,则重新设置 /// </summary> /// <typeparam name="T">对象类型</typeparam> /// <param name="key">缓存键</param> /// <param name="func">缓存委托</param> /// <param name="expires">过期时间(单位:分钟)</param> /// <returns>缓存对象</returns> public static T GetCache<T>(string key, Func<T> func, double expires = 20) where T : class { if (!cache.Contains(key)) { CacheItemPolicy policy = new CacheItemPolicy() { AbsoluteExpiration = DateTimeOffset.Now.AddMinutes(expires) }; T obj = null; if (func != null) { obj = func(); if (obj != null) { cache.Set(key, obj, policy); } } return obj; } else { return cache.GetCacheItem(key).Value as T; }; } }
作者:apegu
地址:http://www.cnblogs.com/jiangqw
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