CacheService.cs

public class CacheService : ICacheService
{
    private readonly MemoryCache _memoryCache = new MemoryCache("Cache.Key");
    
    public void Add<T>(T cacheObject, string key)
    {
        var cacheItemPolicy = new CacheItemPolicy
        {
            AbsoluteExpiration = DateTimeOffset.Now.AddHours(24)
        };
        _memoryCache.Add(new CacheItem(key, cacheObject), cacheItemPolicy);
    }
    
    public void Remove(string key)
    {
        _memoryCache.Remove(key);
    }

    public T Get<T>(string key)
    {
        var cacheItem = _memoryCache.GetCacheItem(key);
        return (T)cacheItem.Value;
    }
    
    public bool IsCached(string key)
    {
        var isCached = _memoryCache.Contains(key);
        
        return isCached;
    }
}

ICacheService.cs

public interface ICacheService
{
    void Add<T>(T cacheObject, string key);
    void Remove(string key);
    T Get<T>(string key);
    bool IsCached(string key);
}