11th article Customizing a cache class (very use ~)

1 //Custom Cache Classes2     Public classCachehelper<t>whereT:class3     {4         Private classEntity5         {6              PublicT value{Get;Set;}7              PublicDateTime Expiretime {Get;Set; }8         }9         Private Static ReadOnlydictionary<string, Entity> dic=Newdictionary<string,entity>();Ten  One          PublicT This[stringKey] A         { -             Get -             { the                 if(! Dic.Keys.Contains (Key))return NULL; -                 vardata =Dic[key]; -                 if(Data. Expiretime >=DateTime.Now) -                 { +                     returndata. Value; -                 } + Remove (key); A                 return NULL; at             } -         } -  -          Public voidADD (stringKey, T value,intmin) -         { -              if(Key = =NULL ) { in                  Throw NewException ("key value cannot be empty"); -             } to              if(Dic.Keys.Contains (key)) +                  Throw NewException ("key value already exists"); -  the              if(Min <=0)Throw NewException ("The expiration time cannot be less than 0 or equal to 0"); *  $              varentity =NewEntity {value = value, Expiretime =DateTime.Now.AddSeconds (min)};Panax Notoginseng Dic.add (key, entity); -         } the  +          Public voidUpdate (stringKey, T value,intmin) A         { the             if(Key = =NULL) +             { -                 Throw NewException ("key value cannot be empty"); $             } $             if(Min <=0)Throw NewException ("The expiration time cannot be less than 0 or equal to 0"); -  -             varentity =NewEntity {value = value, Expiretime =DateTime.Now.AddSeconds (min)}; theDic[key] =entity; -         }Wuyi  the          Public voidRemove (stringkey) -         { Wu             if(Key = =NULL) -             { About                 Throw NewException ("key value cannot be empty"); $             } -             if(!Dic.Keys.Contains (key)) -                 Throw NewException ("key value does not exist"); - Dic.remove (key); A         } +  the}

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How to use:

Private cachehelper<_type> cache =            new cachehelper<_type>(); if NULL ){//......   5*); // ......}

11th article Customizing a cache class (very use ~)