Validation with Modelstate

Question

I have a web application in . NET Framework 4.6.1 with a method similar to the one shown below:

public class MeuControladorController : ApiController
{
    public IHttpActionResult Post([FromBody]AlgumRequest algumRequest)
    {
       try
       {
          if(!ModelState.IsValid)
          {
             return BadRequest(ModelState);
          }

          // Outras cositas mais...

       }
       catch (Exception exception)
       {
          return InternalServerError(exception);
       }
    }
}

The class AlgumRequest is similar to this:

public class AlgumRequest
{
   public IQueDor QueDor { get; set; }
   public byte[] Prop2 { get; set; }
   // ...
}

The estate QueDor is an interface:

public interface IQueDor
{
   string Gritar();
}

Here’s a class that implements it:

public class ChuteCanela : IQueDor, IValidatableObject
{
   [Required]
   public string Texto { get; set; }

   public string Gritar()
   {
      return Texto.ToUpper();
   }

   public IEnumerable<ValidationResult> Validate(ValidationContext validationContext)
   {
      if(Texto == "Palavrão")
      {
         yield return new ValidationResult("Calma, acredite que a ideia era acertar a bola. Mantenha a amizade.");
      }
      // ...
   }
}

The problem is that when sending the data to the method Post the property ModelState.IsValid is true even when I send an instance of some class that implements the interface and should be invalidated.

It is possible to solve this problem while using the ModelState?