TokenInMemoryLruCacheTKey, TValueCacheList - поле

A doubly linked list that stores the keys in the order of usage. The most recently used key is moved to the front, while the least recently used is at the end. This is used to efficiently remove the least recently used (LRU) token when the cache reaches its capacity.

protected readonly LinkedList<TKey> CacheList

Protected ReadOnly CacheList As LinkedList(Of TKey)

protected:
initonly LinkedList<TKey>^ CacheList

val CacheList: LinkedList<'TKey>