How to solve problems with binding?

Question

ASP.NET

There is a model:

[Bind]
public class Person
{
  [ScaffoldColumn(false)]
  public int Id { get; set; }

  [Required]
  [Display(Name = "Фамилия")]
  public string LastName { get; set; }
  
  [Required]
  [Display(Name = "Имя")]
  public string FirstName { get; set; }
  
  [Required]
  [Display(Name = "Отчество")]
  public string MiddleName { get; set; }
  
  [Required]
  [Display(Name = "Возраст")]
  public int Age { get; set; }
}

There are two problems:
1. When receiving data from a request (for example, POST), despite required, it skips empty field values. More precisely, the fields are not specified at all. And it binds.
2. And when I make a GET request for a list of models of this type, on the contrary, I throw an exception because one of the required entries has a null field. But I don't need it to work on receiving - only on request.
PS By the way, I'm wondering how the request data type is determined? Empirically, I found out that the data must be sent in json so that the binding works and there is no error. But what if I wanted to use xml or form-data in general? Can this be specified somewhere?