Error when I pass my object to validate equal null

Hello everyone

I’m sorry I do not speak English and also if this channel is not considered appropriate for clarification of doubt. I am building a WebApi in .Net core 2.0 using version 7.5.2.

A validation that I must do is when my client that will consume my WebApi, should check if the object that arrived is null and for this I did the following validation

My validations

public class FaturaDtoValidator: AbstractValidator<FaturaDto>
   {
       public FaturaDtoValidator()
       {


           RuleFor(fatura => fatura).NotNull().WithMessage(Mensagem.FATURA_OBRIGATORIO);

           RuleFor(fatura => fatura.Itens).SetCollectionValidator(new ContratoItemDtoValidator());
           RuleFor(fatura => fatura.Itens).NotNull().WithMessage(Mensagem.ITENS_OBRIGATORIO);
           RuleFor(fatura => fatura.Itens).Must(list => list.Count == 0).WithMessage(Mensagem.ITENS_OBRIGATORIO);


       }
   }

public class ContratoItemDtoValidator : AbstractValidator<ContratoItemDto>
    {
        public ContratoItemDtoValidator()
        {
            RuleFor(item => item.CodigoItem).NotEmpty().NotNull().WithMessage(Mensagem.CODIGO_ITEM_OBRIGATORIO);
        }
    }

My startup class

    services
                .AddTransient<IValidator<FaturaDto>, FaturaDtoValidator>()
                .AddTransient<IValidator<ContratoItemDto>, ContratoItemDtoValidator>();

Meu controller (My controller)

 [Produces("application/json")]
    [Route("api/v1/")]
    public class HubController : Controller
    {

        [HttpPost("{fatura}")]
        [Route("faturamento")]
        public async Task<IActionResult> Faturamento([FromBody]FaturaDto fatura)
        {
            
            OrchestratorApp orc = new OrchestratorApp();
            return await orc.RedirectFaturamento(fatura);
        }
    }

And to trigger validation

 public async Task<JsonResult> RedirectFaturamento(FaturaDto fatura)
        {
          ...
            FaturaDtoValidator validator = new FaturaDtoValidator();
            ValidationResult results = validator.Validate(fatura);

My FaturaDto object came null and it is this test I would like to include but when the validation is triggered an error occurs “ArgumentNullException: Value can not be null. Parameter name: Can not pass null model to Validate.”

[raffaelmiranda]

I understood the explanation and thank you for your time.

[JeremySkinner]

You’re welcome - let me know if you have any other questions.