public IActionResult TriangleType([FromQuery] int?a, [FromQuery] int?b, [FromQuery] int?c) { if (HasNumberValue(a) && HasNumberValue(b) && HasNumberValue(c)) { return(new JsonResult(_fancyService.GetTriangleType(a, b, c))); } return(BadRequest(new { message = "The request is invalid." })); }