using System;

using System.Reflection;

​

public class NullableTestParent

{

    public string? StringNullable { get; set; }

    public string StringNotNullable { get; set; } = "";

    public NullableTestChild Child { get; set; } = new();

    public class NullableTestChild

    {

        public string? StringNullableChild { get; set; }

        public string StringNotNullableChild { get; set; } = "";

    }

}

​

public class Program

{

    public string? Prop {get;set;}

    public string Prop2 {get;set;}

    private static NullabilityInfoContext _nullabilityContext = new NullabilityInfoContext();

    public static void Main()

    {

        var p1 = typeof(NullableTestParent.NullableTestChild).GetProperty(nameof(NullableTestParent.NullableTestChild.StringNullableChild));

        var p2 = typeof(NullableTestParent.NullableTestChild).GetProperty(nameof(NullableTestParent.NullableTestChild.StringNotNullableChild));

        var nullabilityInfo1 = _nullabilityContext.Create(p1);

        var nullabilityInfo2 = _nullabilityContext.Create(p2);

        Console.WriteLine($"{nameof(NullableTestParent.NullableTestChild.StringNullableChild)} is: " + nullabilityInfo1.WriteState);

        Console.WriteLine($"{nameof(NullableTestParent.NullableTestChild.StringNotNullableChild)} is: " + nullabilityInfo2.WriteState);

    }

}

​