C#语法糖之 cache操作类 asp.net

因为考虑到我下面我将写session cookies 等 操作类 ，与cache具有共性。 所以都统一继承了IHttpStorageObject abstract class来保函数风格的统一 ，但是又为了调用方便，抽象中又使用了单例来简化调用。

使用方法很简单：

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Web;using System.Web.Caching;using System.Collections;using System.Linq.ExPRessions;namespace SyntacticSugar{    /// <summary>    /// ** 描述：缓存操作类    /// ** 创始时间：2015-6-9    /// ** 修改时间：-    /// ** 作者：sunkaixuan    /// ** 使用说明：http://www.cnblogs.com/sunkaixuan/p/4563462.html    /// </summary>    /// <typeparam name="K">键</typeparam>    /// <typeparam name="V">值</typeparam>    public class CacheManager<V> : IHttpStorageObject<V>    {        #region 全局变量        private static CacheManager<V> _instance = null;        private static readonly object _instanceLock = new object();        #endregion        #region 构造函数        private CacheManager() { }        #endregion        #region  属性        /// <summary>                 ///根据key获取value             /// </summary>                 /// <value></value>              public override V this[string key]        {            get { return (V)HttpRuntime.Cache[CreateKey(key)]; }        }        #endregion        #region 公共函数        /// <summary>                 /// key是否存在               /// </summary>                 /// <param name="key">key</param>                 /// <returns> /// 存在<c>true</c> 不存在<c>false</c>.        /// /// </returns>                 public override bool ContainsKey(string key)        {            return HttpRuntime.Cache[CreateKey(key)] != null;        }        /// <summary>                 /// 获取缓存值                 /// </summary>                 /// <param name="key">key</param>                 /// <returns></returns>                 public override V Get(string key)        {            return (V)HttpRuntime.Cache.Get(CreateKey(key));        }        /// <summary>                 /// 获取实例 （单例模式）               /// </summary>                 /// <returns></returns>                 public static CacheManager<V> GetInstance()        {            if (_instance == null)                lock (_instanceLock)                    if (_instance == null)                        _instance = new CacheManager<V>();            return _instance;        }        /// <summary>                 /// 插入缓存(默认20分钟)                /// </summary>                 /// <param name="key"> key</param>                 /// <param name="value">value</param>                  public override void Add(string key, V value)        {            Add(key, value, Minutes*20);        }        /// <summary>                 /// 插入缓存                /// </summary>                 /// <param name="key"> key</param>                 /// <param name="value">value</param>                 /// <param name="cacheDurationInSeconds">过期时间单位秒</param>                 public  void Add(string key, V value, int cacheDurationInSeconds)        {            Add(key, value, cacheDurationInSeconds, CacheItemPriority.Default);        }        /// <summary>                 /// 插入缓存.                 /// </summary>                 /// <param name="key">key</param>                 /// <param name="value">value</param>                 /// <param name="cacheDurationInSeconds">过期时间单位秒</param>                 /// <param name="priority">缓存项属性</param>                 public void Add(string key, V value, int cacheDurationInSeconds, CacheItemPriority priority)        {            string keyString = CreateKey(key);            HttpRuntime.Cache.Insert(keyString, value, null, DateTime.Now.AddSeconds(cacheDurationInSeconds), Cache.NoSlidingExpiration, priority, null);        }        /// <summary>                 /// 插入缓存.                 /// </summary>                 /// <param name="key">key</param>                 /// <param name="value">value</param>                 /// <param name="cacheDurationInSeconds">过期时间单位秒</param>                 /// <param name="priority">缓存项属性</param>                 public  void Add(string key, V value, int cacheDurationInSeconds, CacheDependency dependency, CacheItemPriority priority)        {            string keyString = CreateKey(key);            HttpRuntime.Cache.Insert(keyString, value, dependency, DateTime.Now.AddSeconds(cacheDurationInSeconds), Cache.NoSlidingExpiration, priority, null);        }        /// <summary>                 /// 删除缓存                 /// </summary>                 /// <param name="key">key</param>                 public override void Remove(string key)        {            HttpRuntime.Cache.Remove(CreateKey(key));        }        /// <summary>        /// 清除所有缓存        /// </summary>        public override void RemoveAll()        {            System.Web.Caching.Cache cache = HttpRuntime.Cache;            IDictionaryEnumerator CacheEnum = cache.GetEnumerator();            ArrayList al = new ArrayList();            while (CacheEnum.MoveNext())            {                al.Add(CacheEnum.Key);            }            foreach (string key in al)            {                cache.Remove(key);            }        }        /// <summary>        /// 清除所有包含关键字的缓存        /// </summary>        /// <param name="removeKey">关键字</param>        public override void RemoveAll(Func<string, bool> removeExpression)        {            System.Web.Caching.Cache _cache = HttpRuntime.Cache;            var allKeyList = GetAllKey();            var delKeyList = allKeyList.Where(removeExpression).ToList();            foreach (var key in delKeyList)            {                Remove(key);            }        }        /// <summary>        /// 获取所有缓存key        /// </summary>        /// <returns></returns>        public override IEnumerable<string> GetAllKey()        {            IDictionaryEnumerator CacheEnum = HttpRuntime.Cache.GetEnumerator();            while (CacheEnum.MoveNext())            {                yield return CacheEnum.Key.ToString();            }        }        #endregion        #region 私有函数        /// <summary>                 ///创建KEY           /// </summary>                 /// <param name="key">Key</param>                 /// <returns></returns>                 private string CreateKey(string key)        {            return "http_cache_"+key.ToString();        }        #endregion    }}

using System;namespace SyntacticSugar{    public abstract class IHttpStorageObject<V>    {        public int Minutes = 60;        public int Hour = 60 * 60;        public int Day = 60 * 60 * 24;        public System.Web.HttpContext context = System.Web.HttpContext.Current;        public abstract void Add(string key, V value);        public abstract bool ContainsKey(string key);        public abstract V Get(string key);        public abstract global::System.Collections.Generic.IEnumerable<string> GetAllKey();        public abstract void Remove(string key);        public abstract void RemoveAll();        public abstract void RemoveAll(Func<string, bool> removeExpression);        public abstract V this[string key] { get; }    }}