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 this problem because I had implemented a RequiredAttributeAdapter, which was setting the ErrorMessageResourceName property automatically.

You can fix it by checking to see if the ErrorMessage property has been set before setting the ErrorMessageResourceName:

/// 

/// Creates a new instance of the RequiredAttributeAdapter, used for switching the default required message
/// format
/// 
public CustomMessageRequiredAttributeAdapter(
    ModelMetadata metadata,
    ControllerContext context,
    RequiredAttribute attribute
)
    : base(metadata, context, attribute)
{
    if (string.IsNullOrEmpty(attribute.ErrorMessage))
    {
        attribute.ErrorMessageResourceType = typeof (ValidationMessages);
        attribute.ErrorMessageResourceName = "PropertyValueRequired";
    }
}