ASP.NET MVC adds Validation for non-required fields

Question

I have a model class "Country" with property "CultureId" that is NOT marked as required. Another class "CountryViewModel" holds the same property "CultureId".

When rendering the "Create" view, I noticed that validation data attributes were added to the "CultureId" textbox, although there were no data annotations added.

I am using

@Html.HiddenFor(mode => mode.CultureId)

What might be the cause for such a behavior?

Thanks

Answer 1

I'm guessing your CultureId is an int. MVC automatically adds required tags to non-nullable value types.

To turn this off add

DataAnnotationsModelValidatorProvider.AddImplicitRequiredAttributeForValueTypes = false; 

to Application_Start or make your int nullable

Answer 2

There are couple of ways to handle this -
a). Make the property as Nullable like

public int? Age  { get; set; }

b). Use the below in controller class -

ModelState["Age"].Errors.Clear();

c). Add to the startup- DataAnnotationsModelValidatorProvider.AddImplicitRequiredAttributeForValueTypes = false;