public static void Perform()
{
var mailManager = new MailManager();
var fax = new Fax(mailManager);
mailManager.SimulateNewEmail("Modi", "Trump", "H1-B");
}
public static void PerfromUnregisterNonListener()
{
var mailManager = new MailManager();
var fax = new Fax(mailManager);
fax.Unregister(mailManager);
//Again...Doesn't cause any exception.
fax.Unregister(mailManager);
}
public Fax(MailManager mm)
{
mm.NewMail += mm_NewMail;
}
/// <summary>
/// Removing the non existing listener doesn't throw exception.
/// </summary>
public void Unregister(MailManager mm)
{
mm.NewMail -= mm_NewMail;
}
