// 当有新邮件时 , 通知其他class
// 往外发通知的
protected virtual void OnNewMail(NewMailEventArgs e)
{
//EventHandler<NewMailEventArgs> temp = Interlocked.CompareExchange(ref NewMail, null, null);
//if (temp != null) temp(this, e);
Interlocked.CompareExchange(ref NewMail, null, null)?.Invoke(this, e);
e.Raise(this, ref NewMail);
}
private void FaxMsg(Object sender, NewMailEventArgs e)
{
Console.WriteLine("Faxing mail message:");
Console.WriteLine($"From = {e.From}, To={e.To}, Subject={e.Subject}");
}
public void SimulateNewMail(String from, String to, String subject)
{
NewMailEventArgs e = new NewMailEventArgs(from, to, subject);
OnNewMail(e);
}