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）

system.web.caching.cache是.net为我们提供的一个轻量级的缓存，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&pide;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&pide;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&pide;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");

摘自 lose.zhang