Conditional FluentValidation in mvc 4 application

Question

My Model is as below

[Validator(typeof(PersonValidator))]
public class Person
{
    public string Id { get; set; }
    public string Name { get; set; }

}

public class PersonValidator : AbstractValidator<Person>
{
    public PersonValidator()
    {

      RuleFor(x => x.Name).Length(4, 10)
        .When(per => per.Id.ToUpper() == "FOO");
    }
}

My controller is as below

 public class HomeController : Controller
{
    [HttpPost]
    public ActionResult PersonAction(Person p)
    {

        if (ModelState.IsValid)
        {
            return View();
        }
        else
        {
            return View();
        }
    }
}

i want the following validation been set using Fluent Validation

If Id == 'foo',then Name should have its Length validation
If Id !== 'foo',then Name should NOT have Length validation

But Lenght validation seems to be always getting applied. i.e. irrespective of what is the value of Id, What am i missing ?

i tried but am not able to basically get any correct approch as am very new to Fluent validation. Infact today is the first time i have heard of it and am implementing it in my application — ismail baig
– ismail baig, Commented May 13, 2016 at 17:06
i did check this before writing a question as i could not make out how to implement. It would be great if you could post a sample code. — ismail baig
– ismail baig, Commented May 13, 2016 at 17:31

Tarek · Accepted Answer · 2016-06-13 15:45:34Z

1

When(x => string.Equals(x.Id, "foo", System.StringComparison.CurrentCultureIgnoreCase), () => 
{
   RuleFor(x => x.Name).Length(4, 10).WithMessage([YOUR MESSAGE]);
});

answered Jun 13, 2016 at 15:45

Tarek

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