Output some kind of identity for failing objects

We have the following validation of an input:

public class UserRegisterValidator : AbstractValidator<UserRegister>
    {
        public UserRegisterValidator()
        {
            RuleFor(s => s.Users).SetCollectionValidator(new UserValidator());
        }
    }

public class UserValidator : AbstractValidator<User>
    {
        public UserValidator ()
        {
            RuleFor(s => s.Email).NotEmpty()
        }
    }

This will present the user with messages like

‘Email’ should not be empty.

But who’s email should not be empty?

I’ve seen others getting messages like

'Users[0].Email should not be empty

How can I enable such messages?

But I would like to go one step further. I would like to specify some kind of id for the object, recognizable for the user, like

‘User[John Smith].Email’ should not be empty.

How is that possible?

I guess the answer lies in the PropertyNameResolver, but I’m not sure how…

[vegar]

Another idea I had, was to create a new WithMessage( ) that get the default message as input:

RuleFor(x => x...).Empty().WithMessage(msg => msg + " (User {0})", x => x.Name)

Allowing for ‘light’ customization of the defaults.

[JeremySkinner]

Correct, but because it’s separate there’s probably scope for extending it to support this in a similar way to how WithMessage allows custom format options to be applied via the overload of WithMessage that takes an array of lambda expressions.