Caching common operations

usingSystem;usingSystem.Web.Caching;usingsystem.web;usingSystem.Collections;usingSystem.Text.RegularExpressions;namespacetools{/// <summary>    ///Caching common operations///Autho:songbiao///version:1.4///lastedittime:2015-12-12/// </summary>     Public classCacheutil { PublicCacheutil () {//... Add constructor logic here        }         /// <summary>        ///Add a Cache object/// </summary>        /// <param name= "Strkey" >Key Value name</param>        /// <param name= "Valueobj" >The object being cached</param>        /// <param name= "Durationmin" >cache expiration Time, default is 3 minutes</param>        /// <param name= "priority" >reserved Precedence (enumerated values), 1 is most not cleared, 6 is most easily purged by memory management, 0 is default///"1:notremovable;2:high;3:abovenormal;4:normal;5:belownormal;6:low"</param>        /// <returns>whether the cache write succeeds True, False</returns>         Public Static BOOLInsertcach (stringStrkey,ObjectValueobj,intDurationmin,intPriority )            {TimeSpan ts; if(Strkey! =NULL&& Strkey.length! =0&& Valueobj! =NULL)            {                //create an instance of a callback delegate//OnRemove is the function that the delegate executes, the concrete method looks the following onremove (...)CacheItemRemovedCallback CallBack =NewCacheItemRemovedCallback (onremove); #regionExpiration Time settingif(Durationmin = =0) {TS=NewTimeSpan (0,3,0);//three minutes if not set                }                Else{TS=NewTimeSpan (0, Durationmin,0); }                #endregion                #regionRelative priority of items stored in the System.Web.Caching.Cache objectcacheitempriority cachepriority; Switch(priority) { Case 6: Cachepriority=Cacheitempriority.low;  Break;  Case 5: Cachepriority=Cacheitempriority.belownormal;  Break;  Case 4: Cachepriority=Cacheitempriority.normal;  Break;  Case 3: Cachepriority=Cacheitempriority.abovenormal;  Break;  Case 2: Cachepriority=Cacheitempriority.high;  Break;  Case 1: Cachepriority=cacheitempriority.notremovable;  Break; default: Cachepriority=Cacheitempriority.default;  Break; }                #endregionHttpContext.Current.Cache.Insert (strkey, Valueobj,NULL, DATETIME.NOW.ADD (TS), System.Web.Caching.Cache.NoSlidingExpiration, cachepriority, CallBack); return true; }            Else            {                return false; }        }         /// <summary>        ///determine if the cache object exists/// </summary>        /// <param name= "Strkey" >Cache key Value name</param>        /// <returns>whether there is a true, false</returns>         Public Static BOOLIsexist (stringstrkey) {            returnHttpcontext.current.cache[strkey]! =NULL; }         /// <summary>        ///Reading Cached Objects/// </summary>        /// <param name= "Strkey" >Cache key Value name</param>        /// <returns>Cache object, OBJEC type</returns>         Public Static ObjectGetCache (stringstrkey) {//Remove Value             if(Httpcontext.current.cache[strkey]! =NULL)            {                Objectobj =Httpcontext.current.cache[strkey]; if(obj = =NULL)                {                    return NULL; }                Else                {                    returnobj; }            }            Else            {                return NULL; }        }         /// <summary>        ///To delete a cached object/// </summary>        /// <param name= "Strkey" >Cache key Value name</param>         Public Static voidRemove (stringstrkey) {            if(Httpcontext.current.cache[strkey]! =NULL) {HttpContext.Current.Cache.Remove (strkey); }        }         /// <summary>        ///clears the cache object according to the regular expression set;///the method uses a regular match for the key-value object to be deleted, and if the key value is named uniform, the relevant cache data can be purged by a batch O (∩_∩) o/// </summary>        /// <param name= "pattern" >regular expressions that match key values</param>         Public Static voidRemovebyregexp (stringpattern) {            if(Pattern! ="") {IDictionaryEnumerator enu=HttpContext.Current.Cache.GetEnumerator ();  while(ENU. MoveNext ()) {stringKey =ENU.                    Key.tostring (); if(Regex.IsMatch (key, pattern)) {Remove (key); }                }            }        }         /// <summary>        ///Clear all Cached objects/// </summary>         Public Static voidClear () {IDictionaryEnumerator enu=HttpContext.Current.Cache.GetEnumerator ();  while(ENU. MoveNext ()) {Remove (enu.            Key.tostring ()); }        }          Public StaticCacheItemRemovedReason reason; /// <summary>        ///This method is called before the value is invalidated and can be used to update the database before it expires, or to retrieve the data from the database/// </summary>        /// <param name= "strkey" ></param>        /// <param name= "obj" ></param>        /// <param name= "Reason" ></param>        Private Static voidOnRemove (stringStrkey,Objectobj, CacheItemRemovedReason R) {Reason=R; }    }  }

Caching common operations