normalScope.cs

public class HappyService
{
    public HappyService()
    {
        Console.WriteLine("HappyService create");
    }
    public void Do()
    {
        Console.WriteLine("Ha ha ha ha ha ha ha ha ha ha ha ha ha ha ha");
    }
}

[ApiController]
[Route("[controller]")]
public class WeatherForecastController : ControllerBase
{
    private readonly HappyService _happy;

    public WeatherForecastController(HappyService happy)
    {
        _happy = happy;
    }

    [HttpGet]
    public ActionResult Get()
    {
        _happy.Do();
        
        return Ok();
    }
}