缓存技术，封装好的缓存类

来源：互联网发布：白葡萄酒淘宝编辑：程序博客网时间：2024/04/30 11:36

using System;using System.Collections.Generic;using System.Linq;using System.Web;namespace Admin.Helper{    /// <summary>    /// .net 本身自带的cache相关方法    /// </summary>    public static class CacheHelper    {        /// <summary>        /// fileds        /// </summary>        private static System.Web.Caching.Cache ObjCache = System.Web.HttpRuntime.Cache;        #region Exist方法        /// <summary>        /// 判断指定Key的缓存是否存在        /// </summary>        /// <param name="Key"></param>        /// <returns></returns>        public static bool Exist(string Key)        {            if (ObjCache[Key] == null)            {                return false;            }            return true;        }        #endregion        #region  Get方法        /// <summary>        /// 获得指定Key的缓存对象        /// </summary>        /// <param name="Key"></param>        /// <returns></returns>        public static Object Get(string Key)        {            object objkey = null;            if (ObjCache[Key] != null)            {                objkey = ObjCache.Get(Key);            }            return objkey;        }        #endregion        #region Set方法        /// <summary>        /// 设置缓存        /// </summary>        /// <param name="Key">Cache Key</param>        /// <param name="expiry">缓存时间</param>        /// <param name="obj">缓存对象</param>        public static void Set(string Key, DateTime expiry, object obj)        {            if (ObjCache[Key] != null)            {                ObjCache.Remove(Key);            }            ObjCache.Insert(Key, obj, null, expiry, TimeSpan.Zero);        }        /// <summary>        /// 设置缓存        /// </summary>        /// <param name="Key">Cache Key</param>        /// <param name="min">缓存时间【分钟】</param>        /// <param name="obj">缓存对象</param>        public static void Set(string Key, int min, object obj)        {            double douNum = double.Parse(min.ToString());            Set(Key, DateTime.Now.AddMinutes(douNum), obj);        }        #endregion        #region Del方法        /// <summary>        /// 删除指定Key的缓存        /// </summary>        /// <param name="Key"></param>        public static void Del(string Key)        {            if (ObjCache[Key] != null)            {                ObjCache.Remove(Key);            }        }        #endregion        #region 其他        /// <summary>        /// 获取缓存中的项数        /// </summary>        public static int Count        {            get            {                return ObjCache.Count;            }        }        /// <summary>        /// 获取可用于缓存的千字节数        /// </summary>        public static long PrivateBytes        {            get            {                return ObjCache.EffectivePrivateBytesLimit;            }        }        #endregion    }}

<pre code_snippet_id="155522" snippet_file_name="blog_20140114_2_3856905" name="code" class="csharp">  使用方法如下：/// <summary>        /// 获取产品详情        /// </summary>        /// <param name="proId"></param>        /// <returns></returns>        public static ProductDto GetProduct(string proId)        {            var key = "_ProductId" + proId;            //通过key找到缓存的对象            var cache = Helper.CacheHelper.Get(key);            if (cache != null)            {                return (ProductDto)cache;            }            var pro = ServiceLocator.Create<IProductService>().Get(proId);            if (pro == null) return new ProductDto();            Helper.CacheHelper.Set(key, DateTime.Now.AddHours(8), pro);            return pro;        }

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