Steps:

• configure the memory cache on Services: services.AddMemoryCache();
• Inject it with DI: [FromServices]IMemoryCache cache
• Get the cached data or set it with GetOrCreate: (SlidingExpiration or AbsoluteExpirationRelativeToNow to control the cache expiration)

      ...
      var date = cache.GetOrCreate("MyCacheKey", item =>
        {
          item.SlidingExpiration = TimeSpan.FromSeconds(1);
          // entry.AbsoluteExpirationRelativeToNow = TimeSpan.FromHours(1);
          // entry.SetPriority(CacheItemPriority.High);
          return DateTime.Now;
        }
      );
      ...