public void Add(TKey key, TValue val)
{
if (cache.Count >= capacity)
{
RemoveFirst();
}
var cacheItem = new LruCacheItem <TKey, TValue>(key, val);
var node = new LinkedListNode <LruCacheItem <TKey, TValue> >(cacheItem);
lastUsedItems.AddLast(node);
cache.Add(key, node);
}
private bool IsItemTooOld(LruCacheItem <TKey, TValue> cacheItem)
{
var now = DateTime.Now;
return(now - cacheItem.AddingTime > maxLifeTime);
}