How to require parameters in action

问题

I want to validate that a parameter is present in the action.

public string PorCarrera([Required] DateTime fechaDesde, [Required] DateTime fechaHasta, string carrera = null) {
            return InformacionInscripcionesViewModel.GetTotalesInscripcionesPorCarrera(fechaDesde, fechaHasta, carrera);
        }

I would expect the framework to throw a BadRequest when calling the action without parameters but it is not happening.

All examples talk about modelState.IsValid but I don't have any model that represents this data, because these are just queries to a DB.

回答1:

What you need to is make a model to represent your parameters. Something like this:

public class PorCarreraModel
{
    [Required]
    DateTime fechaDesde { get; set; }
    [Required]
    DateTime fechaHasta { get; set; }
    string carrera { get; set; }
}

Then you can make your controller action like this:

public IActionResult PorCarrera(PorCarreraModel model) {
     if(ModelState.IsValid == false)
     {
          return BadRequest(ModelState);
     }
     string totals = InformacionInscripcionesViewModel.GetTotalesInscripcionesPorCarrera(model.fechaDesde, model.fechaHasta, model.carrera);
     return Content(totals);
}

来源：https://stackoverflow.com/questions/39536081/how-to-require-parameters-in-action