What happens with event handlers when an object goes out of scope?

Question

Let\'s say we have the following setup:

public class ClassA
{
   public event EventHandler SomeEvent;
}

public class ClassB : IDisposable
{
   public void S         


        

Answer 1

Nothing you have above would unhook your event handler. Since both a and b go out of scope at the same time, you'd be safe. Since a and b can both be collected, then a will not keep b alive.

If you were to raise the ClassA.SomeEvent event after your using statement, then ClassB.DoSomething will be called even though b has been disposed. You would have to explicitly remove the event handler in this case.

If you were to retain a reference to a somewhere else, then b would be keep alive by a. Again, because the event handler has not been removed.