Reference to an object is not updating the object

Question

Hi I am working with code that looks something like this .

class A
{
    Custom objA;

    public A()
    {
        //Assign some value to objA;
        B obj =          


        

Answer 1

In function Func you assign null to the field of B object (not A object) so after this function call field objB of B object is not pointing to any object of type Custom, but objA field of A object is still pointing to a single Custom object.

Here is example of code, where Func will change objA field of A object:

class A
{
    public Custom objA = new Custom();

    public A()
    {
        B obj = new B(this);
        B.Func(); // after this, objA field will be null
    }
}

class B
{
    А obj;

    public B(А obj)
    {
        this.obj = obj;
    }

    public void Func()
    {
        obj.objA = null;
    }
}

Also note:

1. When you create an A object, its objA field is null, so in constructor of A you actually calling B obj = new B(null);, so its objB field is null too.
2. After A object is constructed, object obj of type B will be disposed, since you don't hold a reference to it, so you not calling a Func function in your example.