.NET Core Web API - Size limits

WeatherForecastController.cs

// In Startup.ConfigureServices, 
services.AddMemoryCache(options =>
{
    // Overall 1024 size (no unit)
    options.SizeLimit = 1024;
});

// In WeatherForecastController.cs
[HttpGet]
public IEnumerable<WeatherForecast> Get()
{
    IEnumerable<WeatherForecast> weatherForecastCollection = null;
    if (_memoryCache.TryGetValue(weatherForecastKey, out weatherForecastCollection))
    {
        return weatherForecastCollection;
    }

    weatherForecastCollection = GetWeatherForecast();
    var cacheOptions = new MemoryCacheEntryOptions()
        .SetSize(1)                                   // Set size of current item
        .SetSlidingExpiration(TimeSpan.FromSeconds(10))
        .SetAbsoluteExpiration(TimeSpan.FromSeconds(30));

    _memoryCache.Set(weatherForecastKey, weatherForecastCollection, cacheOptions);
    return weatherForecastCollection;
}