/// <summary>
/// 重载基类方法，删除传入的CacheItem
/// </summary>
/// <param name="cacheItem">缓存队列对象</param>
internal protected override void RemoveItem(CacheItemBase cacheItem)
{
this.Remove(((CacheItem <TKey, TValue>)cacheItem).Key);
}
/// <summary> /// 虚方法，删除Cache项 /// </summary> /// <param name="cacheItem">被删除的Cache项</param> internal protected abstract void RemoveItem(CacheItemBase cacheItem);