static void Main(string[] args)
{
ClassA a = new ClassA();
ReferenceClassB b = (ReferenceClassB)a.GetType().GetField("reference", BindingFlags.NonPublic | BindingFlags.Instance).GetValue(a);
WeakReference weakA = new WeakReference(a);
WeakReference weakB = new WeakReference(b);
a = null;
b = null;
GC.Collect();
Debug.Assert(weakA.IsAlive == false);
Debug.Assert(weakB.IsAlive == false);
}
public ClassA()
{
reference = new ReferenceClassB(this);
}