Question

what happens if i link a method of some object to a delegate, and then dispose of the object?

Like this:

class Hunter
{
    public event Action Shoot;

    public execute()
    {
        Form formBabySeal = new Form();

        Shoot += formBabySeal.Close;

        formBabySeal.Show();
        formBabySeal.Close(); //Dispose Form

        if (Shoot != null)
        {
             Shoot(); //event is null?
        }
    }
}

Answer 1

formBabySeal is not null just because you dispose it. So, formBabySeal.Close() will be called.

Your code is equivalent to this when looking at what methods are called:

Form formBabySeal = new Form();

formBabySeal.Show();
formBabySeal.Close(); //Dispose Form
formBabySeal.Close();

This will close the form (first call to Close) and the second call won’t do anything, because the form is already closed.

However, as Steve points out in the comment section, your code will introduce a memory leak, because Shoot still holds a reference to the Close method of formBabySeal and because of this formBabySeal will be kept alive as long as the instance of the class Hunter is alive.