Standardize error messages in Dataannotations in Viewmodels classes

Question

It is possible to standardize the error messages used in Dataannotations, so that it is not necessary to pass a string like:

[Required(ErrorMessage = "Este campo é obrigatório.")]

But you can use it more or less like this:

string mensagem = "Este campo é obrigatório.";
[Required(ErrorMessege = mensagem)]

Answer 1

Yes, use a Resource for that. In my case it’s called Mensagemerro.resx:

[Required(ErrorMessageResourceName = "CampoObrigatorio", ErrorMessageResourceType = typeof(MensagemErro))]

Basically I say I have a resource like MensagemErro with a name called CampoObrigatorio.

In this example I still use a {0} to concatenate a name, but ignore in your case.