// Pass the MailManager object to the constructor
public Pager(MailManager mm)
{
// Construct an instance of the ProcessMailMsgEventHandler
// delegate that refers to our SendMsgToPager callback method.
// Register our callback with MailManager's ProcessMailMsg event
mm.NewMail += SendMsgToPager;
}
// Pass the MailManager object to the constructor
public Fax(MailManager mm)
{
// Construct an instance of the EventHandler<NewMailEventArgs>
// delegate that refers to our FaxMsg callback method.
// Register our callback with MailManager's NewMail event
mm.NewMail += FaxMsg;
}
public static void Go()
{
// Construct a MailManager object
MailManager mm = new MailManager();
// Construct a Fax object passing it the MailManager object
Fax fax = new Fax(mm);
// Construct a Pager object passing it the MailManager object
Pager pager = new Pager(mm);
// Simulate an incoming mail message
mm.SimulateNewMail("Jeffrey", "Kristin", "I Love You!");
// Force the Fax object to unregister itself with the MailManager
fax.Unregister(mm);
// Simulate an incoming mail message
mm.SimulateNewMail("Jeffrey", "Mom & Dad", "Happy Birthday.");
}
static void Main(string[] args)
{
MailManager.Go();
TypeWithLotsOfEventsTest();
}
public void Unregister(MailManager mm)
{
// Unregister ourself with MailManager's ProcessMailMsg event
mm.NewMail -= SendMsgToPager;
}
// This method could be executed to have the Fax object unregister itself with the NewMail
// event so that it no longer receives notifications
public void Unregister(MailManager mm)
{
// Unregister ourself with MailManager's NewMail event
mm.NewMail -= FaxMsg;
}