Validation error is not thrown when a complex type property with required and from body attributes has null value

[kirthik]

Assume a model like this

public class Customer
{
        public int Id {get; set;}
        [Required]
        [FromBody]
        public Address Address {get; set;}
}

public class Address
{
     public string Street {get; set;}
}

And I have an action

public IActionResult CreateCustomer(int id)
{
     var c = GetCustomer(id);
     TryUpdateModel(c)
     if (!ModelState.IsValid)
    { ....}
}

If I call CreateCustomer with empty json in the body, expectation is I will get a model state error saying Address is required but ModelState does not contain that error.

[danroth27]

@kirthik What happens if you don't use [FromBody] but just do a form post instead? What is the behavior on MVC 5 when using model binding?

[kirthik]

When I do a form post, ModelState shows validation error for Address property