在IMemoryCache实现中不要使缓存项过期

自从 IMemoryCache 不会提供太多有关缓存项的信息,我正考虑实现一些自定义项,以便在缓存中保留有关项的数据,如 key , AbsoluteExpiration 财产等。

这是我的实现 伊梅莫里奇 :

public class MemoryCacheService : IMemoryCache
{
    private readonly MemoryCache _memoryCache;
    private readonly List<CacheItemRelevantData> _allKeys;
    private readonly string AllKeys = "___All__Keys___";
    public MemoryCacheService()
    {
        _memoryCache = new MemoryCache(new MemoryCacheOptions());
        _allKeys = new List<CacheItemRelevantData>();
        _memoryCache.Set(AllKeys, _allKeys, new MemoryCacheEntryOptions
        {
            AbsoluteExpiration = DateTimeOffset.MaxValue
        });
    }

    public void Dispose()
    {
        _memoryCache.Dispose();
    }

    public bool TryGetValue(object key, out object value)
    {
        return _memoryCache.TryGetValue(key, out value);
    }

    public ICacheEntry CreateEntry(object key)
    {
        var entry = _memoryCache.CreateEntry(key);
        entry.RegisterPostEvictionCallback((o, v, reason, state) =>
        {
            if (reason.In(EvictionReason.Capacity, EvictionReason.Expired, EvictionReason.TokenExpired))
            {
                var item = _allKeys.FirstOrDefault(x => x.Key.ToString() == o.ToString());
                if (item != null)
                {
                    _allKeys.Remove(item);
                }
            }
        });
        if (!_allKeys.Select(x => x.Key).Contains(key))
        {
            _allKeys.Add(new CacheItemRelevantData
            {
                Key = entry.Key,
                AbsoluteExpiration = entry.AbsoluteExpiration,
                Priority = entry.Priority,
                AbsoluteExpirationRelativeToNow = entry.AbsoluteExpirationRelativeToNow,
                Size = entry.Size
            });
        }
        return entry;
    }

    public void Remove(object key)
    {
        var entry = _allKeys.FirstOrDefault(x => x.Key.ToString() == key.ToString());
        if (entry != null)
        {
            _allKeys.Remove(entry);
        }

        _memoryCache.Remove(key);
    }
}

但是自从 _allKeys 是为了存储缓存项的相关数据而创建的,我不希望它过期。

有没有办法将“过期时间”设置为“无”或类似的值 _所有键 列表将永远保存在缓存中?