Either ErrorMessageString or ErrorMessageResourceName must be set, but not both error using CreditCardAttribute

Question

This is my model:

namespace MvcApplication2.Models
{
    public class CreditCard
    {
        [CreditCard(ErrorMessageResourceType = typeof(Messages), Error         


        

Answer 1

I had a simmilar issue with a custom ValidationAttribute.

In the IsValid method I was setting the ErrorMessage. The fix was to remove the assignation to the ErrorMessage propety...

protected override ValidationResult IsValid(object value, ValidationContext validationContext)
{
    //code before ...
    this.ErrorMessage = this.FormatErrorMessage(validationContext.DisplayName); //NOT GOOD...
    ValidationResult validationResult = new ValidationResult(this.ErrorMessage, //And using the ErrorMessage Here...
        new[] { validationContext.MemberName });
    return validationResult;
}

I was writting Unit test and they were pasisng only if i was running/debugging one by one. But when I click "Run All", only the first one was passing? They are not Linked in any ways...

So yeah, just remove the remove the assignation to the ErrorMessage propety

I hope it will help someone!