.net简单的缓存类

来源：互联网发布：mac运行32位软件编辑：程序博客网时间：2024/06/06 03:16
接着上一篇内容，下面处理webapi宿主到windows服务中时，简单的缓存类处理：
using System;using System.Collections;using System.Web;using System.Web.Caching;namespace aaaaa.Api.Business{    /// <summary>    /// 缓存类    /// </summary>    public class CacheHelper    {        /// <summary>        /// 增加一个缓存对象        /// </summary>        /// <param name="strKey">键值名称</param>        /// <param name="valueObj">被缓存对象</param>        /// <param name="durationMin">缓存失效时间（默认为5分钟）</param>        /// <param name="cachePriority">保留优先级(枚举数值)</param>        /// <returns>缓存写入是否成功true 、false</returns>        public static bool InsertCach(string strKey, object valueObj, int durationMin,            CacheItemPriority cachePriority = CacheItemPriority.Default)        {            TimeSpan ts;            if (!string.IsNullOrWhiteSpace(strKey) && valueObj != null)            {                //onRemove是委托执行的函数，具体方法看下面的onRemove(...)                CacheItemRemovedCallback callBack = new CacheItemRemovedCallback(onRemove);                ts = durationMin == 0 ? new TimeSpan(0, 5, 0) : new TimeSpan(0, durationMin, 0);                //HttpContext.Current.Cache.Insert(                HttpRuntime.Cache.Insert(                    strKey,                    valueObj,                    null,                    DateTime.Now.Add(ts),                    Cache.NoSlidingExpiration,                    cachePriority,                    callBack                );                return true;            }            else            {                return false;            }        }        /// <summary>        /// 判断缓存对象是否存在        /// </summary>        /// <param name="strKey">缓存键值名称</param>        /// <returns>是否存在true 、false</returns>        public static bool IsExist(string strKey)        {            //return HttpContext.Current.Cache[strKey] != null;            return HttpRuntime.Cache.Get(strKey) != null;        }        /// <summary>        /// 读取缓存对象        /// </summary>        /// <param name="strKey">缓存键值名称</param>        /// <returns>缓存对象，objec类型</returns>        public static object GetCache(string strKey)        {            //if (HttpContext.Current.Cache[strKey] != null)            if (IsExist(strKey))            {                object obj = HttpRuntime.Cache.Get(strKey);                return obj ?? null;            }            else            {                return null;            }        }        /// <summary>        /// 移除缓存对象        /// </summary>        /// <param name="strKey">缓存键值名称</param>        public static void Remove(string strKey)        {            //if (HttpContext.Current.Cache[strKey] != null)            if (IsExist(strKey))            {                HttpRuntime.Cache.Remove(strKey);            }        }        /// <summary>        /// 清除所有缓存        /// </summary>        public static void Clear()        {            IDictionaryEnumerator enu = HttpRuntime.Cache.GetEnumerator();            while (enu.MoveNext())            {                Remove(enu.Key.ToString());            }        }        public static CacheItemRemovedReason reason;        /// <summary>        /// 此方法在值失效之前调用，可以用于在失效之前更新数据库，或从数据库重新获取数据        /// </summary>        /// <param name="strKey"></param>        /// <param name="obj"></param>        /// <param name="reason"></param>        private static void onRemove(string strKey, object obj, CacheItemRemovedReason r)        {            reason = r;        }        //...    }}
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