Localization in ASP.NET MVC 4 using App_GlobalResources

Question

I am trying to accomplish two things:

1. Localize the “built-in” error messages for “FieldMustBeDate” and \"FieldMustBeNumeric\".
2. Localize some of the other

Answer 1

I have made some minor additions to the original post, which didn't translate all messages in my case. (String length and invalid property values)

Follow the above steps, to create the *.resx files, set their properties, and then set the locale in web.config, as described by Andreas.

Then create a couple of adapters:

// As described in original post:
public class LocalizedRequiredAttributeAdapter : RequiredAttributeAdapter
{
    public LocalizedRequiredAttributeAdapter(
        ModelMetadata metadata,
        ControllerContext context,
        RequiredAttribute attribute
    )
        : base(metadata, context, attribute)
    {
        if (attribute.ErrorMessageResourceType == null)
            attribute.ErrorMessageResourceType = typeof(Resources.Resources);
        if (attribute.ErrorMessageResourceName == null)
            attribute.ErrorMessageResourceName = "PropertyValueRequired";
    }
}

// Addition to original post:
public class LocalizedStringLengthAttributeAdapter : StringLengthAttributeAdapter
{
    public LocalizedStringLengthAttributeAdapter(
        ModelMetadata metadata,
        ControllerContext context,
        StringLengthAttribute attribute
    )
        : base(metadata, context, attribute)
    {
        if (attribute.ErrorMessageResourceType == null)
            attribute.ErrorMessageResourceType = typeof(Resources.Resources);
        if (attribute.ErrorMessageResourceName == null)
            attribute.ErrorMessageResourceName = "StringLengthAttribute_ValidationError";
    }
}

And in Global.asax.cx:

// Addition to original post: (Used for "PropertyValueInvalid")
DefaultModelBinder.ResourceClassKey = "Resources";

// As described in original post:
ClientDataTypeModelValidatorProvider.ResourceClassKey = "Resources";
DataAnnotationsModelValidatorProvider.RegisterAdapter(typeof(RequiredAttribute), typeof(LocalizedRequiredAttributeAdapter));
DataAnnotationsModelValidatorProvider.RegisterAdapter(typeof(StringLengthAttribute), typeof(LocalizedStringLengthAttributeAdapter));