Check email validity with FluentValidation when property is not empty

Question

I'd like with FluentValidation check the email format. The email is not mandatory. Then I have to check only when the property is not empty.How can I do this ? Below I check all the time.

RuleFor(x => x.Email)
    .EmailAddress()
    .WithLocalizedMessage(() => "My message.");

Thanks

Answer 1

Use where or unless.

RuleFor(x => x.Email)
    .EmailAddress()
    .WithLocalizedMessage(() => "My message.")
    .Unless(x => string.IsNullOrEmpty(x.Email));

EDIT: Updated documentation link.