Question

Using a resx file in the App_GlobalResources directory, I ve been able to change the default message for the PropertyValueInvalid string of the model validators.

But it doesn t work to translate the message when a value is required (PropertyValueRequired.)

In the Global.asax.cs Application_Start() I ve changed the resource class key, like this:

DefaultModelBinder.ResourceClassKey = "Messages";

And in the Messages.resx files I ve put two entries:

"PropertyValueInvalid" => "O valor {0} é inválido para o campo {1}."
"PropertyValueRequired" = > "É necessário digitar o {0}."

Thanks.

Answer 1

RequiredAttribute not used DefaultModelBinder.GetValueRequiredResource. Create custom DataAnnotationsModelValidator class.

public class MyRequiredAttributeAdapter : RequiredAttributeAdapter
{
  public MyRequiredAttributeAdapter(ModelMetadata metadata, 
                                    ControllerContext context, 
                                    RequiredAttribute attribute) 
         : base(metadata, context, attribute)
  {
    attribute.ErrorMessageResourceType = typeof (Messages);
    attribute.ErrorMessageResourceName = "PropertyValueRequired";
  }
}

and register adapter in Global.asax.

DataAnnotationsModelValidatorProvider.RegisterAdapter(
    typeof(RequiredAttribute), 
    typeof(MyRequiredAttributeAdapter));

Hope this help!

Reusable Validation Error Message Resource Strings for DataAnnotations

Answer 2

This message is baked into System.ComponentModel.DataAnnotations assembly under the key RequiredAttribute_ValidationError. You could write a custom validation attribute:

public class MyRequiredAttribute : RequiredAttribute
{
    public MyRequiredAttribute()
    {
        ErrorMessageResourceType = typeof(Messages);
        ErrorMessageResourceName = "Required";
    }
}

and then inside your Messages.resx file define the Required string:

Required => É necessário digitar o {0}.

and finally decorate your view model property with this custom attribute:

public class MyViewModel
{
    [MyRequired]
    public int Foo { get; set; }
}

Answer 3

How about

[Required (ErrorMessageResourceName="Required",ErrorMessageResourceType=typeof(Messages)]

public string Foo { get; set; }

Required => É necessário digitar o {0}.

Or

Required => {0} field is required.

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Answer 4

Just add like this

[Required(ErrorMessage = "Your Error Message, here..!")]

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