Type excluded from validation triggers validation for Required members

[kichalla]

For the following setup:

public class Customer
{
    public int Id { get; set; }

    [Required]
    [MaxLength(5)]
    public string Name { get; set; }

    public Address Address { get; set; }
}

public class Address
{
    [Required]
    [MaxLength(5)]
    public string City { get; set; }

    [Required]
    [MaxLength(5)]
    public string State { get; set; }
}

//-------------------------

services.ConfigureMvc(options =>
{
    options.ValidationExcludeFilters.Add(typeof(Address));
});

//-------------------------

public class CustomersController : Controller
{
    public IActionResult Create(Customer customer)
    {
        if(!ModelState.IsValid)
        {
            return HttpBadRequest(ModelState);
        }

        return Json(customer);
    }
}

Following are the behaviors:

• Request: http://localhost:5001/Customers/Create?Id=10&Name=John
  Result: 200 OK response with body having {"Id":10,"Name":"John","Address":null}
• Request: http://localhost:5001/Customers/Create?Id=10&Name=John&Address.City=Redmondddddddddddddddd
  Result: 400 Bad Request with error {"Address.State":["The State field is required."]}
• Request: http://localhost:5001/Customers/Create
  Result: 400 Bad Request with error {"Name":["The Name field is required."]}
  NOTE: For this case I excluded the type Customer itself

Expected: For the 2nd case, the data should be bound successfully without any validation errors and for the 3rd case the model should be null without any validation errors?

[Eilon]

Seemingly mildly approximately related to #2316

[Eilon]

See if your Required change fixes this. If not, move to beta6.

[ajaybhargavb]

I tried these scenarios.
Looks like case 2 is now working as expected.
Request: http://localhost:5001/Customers/Create?Id=10&Name=John&Address.City=Redmondddddddddddddddd
Result then: 400 Bad Request with error {"Address.State":["The State field is required."]}
Result now: 200 OK response with body {"Id":10,"Name":"John","Address":{"City":"Redmondddddddddddddddd","State":null}}

Whereas case 3 is still the same. (Added Customer type to exclude filter)
Request: http://localhost:5001/Customers/Create
Result: 400 Bad Request with error {"Name":["The Name field is required."]}