balexandre balexandre - 3 months ago 26
C# Question

FluentValidation how to check for Length if string is not null?

I'm testing a

PUT
with two
string
:

company.CurrencyCode = request.CurrencyCode ?? company.CurrencyCode;
company.CountryIso2 = request.Country ?? company.CountryIso2;


and I tried with a rule like:

public UpdateCompanyValidator()
{
RuleSet(ApplyTo.Put, () =>
{
RuleFor(r => r.CountryIso2)
.Length(2)
.When(x => !x.Equals(null));

RuleFor(r => r.CurrencyCode)
.Length(3)
.When(x => !x.Equals(null));
});
}


as I don't mind to get a
null
on those properties, but I would like to test the
Length
when the property is not a
null
.

What is the best way to apply rules when a property is
nullable
and we just want to test if it's not null?

Answer

One of the ways would be:

public class ModelValidation : AbstractValidator<Model>
{
    public ModelValidation()
    {
        RuleFor(x => x.Country).Must(x => x == null || x.Length >= 2);
    }
}
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