How to use the required modifier in C# properties correctly?

Question

public class State
{
    public int StateId { get; set; }

    public required string StateName { get; set; }

    public required ICollection<District> Districts { get; set; }


    public static void CreateNewState()
    {

        State state = new State(); 

    }
}

I am using Entity Framework Core.

I want to create a 'New State'.

I get the errors below.

Required member state.StateName must be set in the object initiailzer or attribute constructor.
Required member state.Districts must be set in the object initializer or attribute constructor.

I am looking for guidance to use the required modifier correctly.  I am not able to understand how to use the object initializer or attribute constructor.

Answer 1

This initialization should solve the compilation errors:

public static void CreateNewState( )
{
    State state = new State { StateName = "some name", Districts = new List<District>( ) };


}

You can also set the StateId and add items to Districts.

Answer 2

The required keyword is unrelated to entity framework. It marks a property / field needs it value set during construction. If you want a field required with EF you use the [Required] attribute.