[Question] Combining FluentValidation and IValidatableObject Errors

Is it possible to run both FluentValidation and IValidatableObject in the same ViewModel? For example if I had the following ViewModel:

public class TestViewModel
{
    public Foo Foo { get; set; }
    public Bar Bar { get; set; }
}

public class Foo : IValidatableObject
{
    public string FooName { get; set; }

    public IEnumerable<ValidationResult> Validate(System.ComponentModel.DataAnnotations.ValidationContext validationContext)
    {
        if (string.IsNullOrEmpty(FooName))
        {
            yield return new ValidationResult("Required from IValidatableObject", new[] { "FooName" });
        }
    }
}

[Validator(typeof(BarValidator))]
public class Bar
{
    public string BarName { get; set; }
}

public class BarValidator : AbstractValidator<Bar>
{
    public BarValidator() {
        RuleFor(x => x.BarName).NotNull().WithMessage("Required from FluentValidation");
    }
}

Is there a way both Foo and Bar validations can run and return the results when my Controller calls ModelState.IsValid?

[JeremySkinner]

I’ve just pushed out 7.2-beta1 with initial support for IValidatableObject. Please feel free to give it a try. Note that this only supports top-level objects, but not child properties

[JeremySkinner]

It’s something I’d like to enable support for in the future in aspnetcore, but there are a lot of implications for doing this and requires a lot of work, so it’s not something that’ll be added soon I’m afraid.