Code sample:
Model:
[Required(ErrorMessage = "Campo CPF ou CNPJ obrigatório")]
[Display(Name = "CPF")]
public string CPF { get; set; }
[Display(Name = "CNPJ")]
public string CNPJ { get; set; }
User must fill in one of the CPF or CNPJ fields (either he fills in the CPF, or he fills in the CNPJ). How can I do this with DataAnnotation ?
It is not decorated by attributes that you will solve. Implement IValidatableObject in Model :
public class MeuModel : IValidatableObject
{
...
[Display(Name = "CPF")]
public string CPF { get; set; }
[Display(Name = "CNPJ")]
public string CNPJ { get; set; }
public IEnumerable<ValidationResult> Validate(ValidationContext validationContext)
{
if (String.IsNullOrEmpty(CPF) && String.IsNullOrEmpty(CNPJ))
{
yield return new ValidationResult("É necessário definir ou CPF ou CNPJ.", new [] { "CPF", "CNPJ" });
}
if (!String.IsNullOrEmpty(CPF) && !String.IsNullOrEmpty(CNPJ))
{
yield return new ValidationResult("CPF e CNPJ não podem ambos ter valor.", new [] { "CPF", "CNPJ" });
}
}
}