How can I find out which class property is assigned to a given instance?

Question

OOP

Question for C# experts.
I have two classes:

class A {
    public B prop1 {get; set;}
    public B prop2 {get; set;}
}

class B {
    public B() {
        // я присвоен свойству prop1 или prop2?
    }
}

How can I find out from the constructor of class B which of the properties of the parent class A (prop1 or prop2) this instance of class B is assigned to? Interested in the name of the property.

Answer 1

class A
{
    private B _prop1;
    public B prop1
    {
        get => _prop1;
        set => SetProp(value, ref _prop1);
    }

    private B _prop2;
    public B prop2
    {
        get => _prop2;
        set => SetProp(value, ref _prop2);
    }

    private void SetProp(B value, ref B field, [CallerMemberName] string propName = null)
    {
        if(field != null) field.Association = null;
        field = value;
        if (field != null) field.Association = propName;
    }

}

class B
{
    public string Association { get; set; }
}

How do you like this decision?

Answer 2

The question is incorrect. an instance of class B at the time of code execution in the constructor cannot be assigned to anything. First, the type constructor is executed, and then the instance can get into either prop1 or prop2.

Answer 3

Pass class A to the constructor or use reflection. Well, or just pass the name to the constructor.