System.Web.Caching.Cache是.net为我们提供的一个轻量级的缓存组件，它提供了最基础的增，增过期，删除，获取等操作，下面是对Cache进行的一个封装，方便以后统一调用和扩展。

/// <summary>
    /// 缓o存?相à关?的?操ù作÷类à
    /// 占?占?
    /// </summary>
    public class DataCache
    {
        /// <summary>
        /// 获?取?当±前°应|用?程ì序ò指?定¨CacheKey的?Cache值μ
        /// </summary>
        /// <param name="CacheKey"></param>
        /// <returns></returns>
        public static object GetCache(string CacheKey)
        {
            System.Web.Caching.Cache objCache = HttpRuntime.Cache;
            return objCache[CacheKey];

        }
        /// <summary>
        /// 设è置?当±前°应|用?程ì序ò指?定¨CacheKey的?Cache值μ
        /// 调÷用?：oDataCache.SetCache("name", "zzl");
        /// </summary>
        /// <param name="CacheKey"></param>
        /// <param name="objObject"></param>
        public static void SetCache(string CacheKey, object objObject)
        {
            System.Web.Caching.Cache objCache = HttpRuntime.Cache;
            objCache.Insert(CacheKey, objObject);
        }

        /// <summary>
        /// 设è置?当±前°应|用?程ì序ò指?定¨CacheKey的?Cache值μ
        /// 调÷用?：oDataCache.SetCache("name", "zzl", DateTime.Now.AddMinutes(1), TimeSpan.Zero);
        /// </summary>
        /// <param name="CacheKey"></param>
        /// <param name="objObject"></param>
        public static void SetCache(string CacheKey, object objObject, DateTime absoluteExpiration, TimeSpan slidingExpiration)
        {
            System.Web.Caching.Cache objCache = HttpRuntime.Cache;
            objCache.Insert(CacheKey, objObject, null, absoluteExpiration, slidingExpiration);
        }

        /// <summary>
        /// 移?除y指?定¨Cache
        /// </summary>
        /// <param name="CacheKey"></param>
        public static void RemoveCache(string CacheKey)
        {
            System.Web.Caching.Cache objCache = HttpRuntime.Cache;
            objCache.Remove(CacheKey);

        }

        #region Events
        /// <summary>
        /// 缓o存?删?除y事?件t
        /// </summary>
        public static event CacheEventHandler CacheDeleted;
        #endregion

        #region Methods
        /// <summary>
        /// 触￥发￠缓o存?删?除y事?件t
        /// </summary>
        public static void OnCacheDeleted(string key)
        {
            if ((CacheDeleted != null))
            {
                CacheDeleted(null, new CacheEventArgs(key));
            }

          　Remove(key);

        }
        #endregion
    }

    #region Delegates
    /// <summary>
    /// 缓o存?委ˉ托D
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    public delegate void CacheEventHandler(object sender, CacheEventArgs e);
    #endregion

    /// <summary>
    /// 缓o存?事?件t源′
    /// </summary>
    public class CacheEventArgs
    {
        public CacheEventArgs()
        {

        }
        public CacheEventArgs(string cacheKey)
        {
            this.CacheKey = cacheKey;
        }
        public string CacheKey { get; set; }
    }

在这个类中，有一个关于删除键时的事件，它的作用是在删除某个键时，进行与它关联的其它操作，例如：在用户登出时，希望将它的cache记录清除，并删除一些记录性的操作，但记录性的操作是不固定的，为了为破坏程序的完整性，我们可以在登出时，先去将其需要的操作进行有订阅，如果以后有其它删除cache键需要的关联操作，只要订阅就可以了

代码如下：

static CommonMethod()
       {
           iUserRepository = new UserRepository();
           //订?阅?了?CacheDeleted这a个?事?件t，?当±它ü被?触￥发￠时±，?将?自?动ˉ执′行D被?绑ó定¨的?方?法¨
           DataCache.CacheDeleted += new CacheEventHandler(ClearUserRecord);
           DataCache.CacheDeleted += new CacheEventHandler(ClearProductRecord);
       }

 　　 #region 删?除yCache后ó，?需è要a做?的?其?它ü事?情é
        static void ClearUserRecord(object sender, CacheEventArgs e)
        {
            DataCache.SetCache("msg1", e.CacheKey + "被?删?除y了?");
        }


        static void ClearProductRecord(object sender, CacheEventArgs e)
        {
            DataCache.SetCache("msg2", e.CacheKey + "真?的?被?删?除y了?");
        }
        #endregion

在登出操作后，可以去触发删除cache键的操作：

 

public static ActionResult UserLogOutModule(Controller controller)
       {
           string returnUrl = controller.Request.QueryString["returnUrl"];
           Standard.ClientHelper.UserLogout();

　 DataCache.OnCacheDeleted("name");

本文转自博客园张占岭（仓储大叔）的博客，原文链接：System.Web.Caching.Cache删除某键后，希望同时触发其它动作（关键时刻，还是事件靠的住），如需转载请自行联系原博主。