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：

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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             } }

　　

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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; }     } }