public void Subscribe(IRandomEventCOMEvents callback)
{
if (callback == null)
throw new ArgumentNullException("callback");
// Note: Make sure multi-threaded concurrency is set. Because timer
// events can execute on different threads, the COM callback
// calls will freeze if multi-threaded concurrency is NOT set.
if (Thread.CurrentThread.GetApartmentState() != ApartmentState.MTA)
throw new Exception("Multithreaded object concurrency required");
if (m_callback == null)
{
m_callback = callback;
}
else
{
throw new Exception("Callback is already specified");
}
}
public void Unsubscribe()
{
m_callback = null;
}