protected virtual void OnRaiseCustomEvent(TimerEventArgs e) { // Make a temporary copy of the event to avoid possibility of // a race condition if the last subscriber unsubscribes // immediately after the null check and before the event is raised. EventHandler<TimerEventArgs> handler = RaiseTimerEvent; // Event will be null if there are no subscribers if (handler != null) { // Format the string to send inside the CustomEventArgs parameter e.Message += DateTime.Now.ToString(); // Use the () operator to raise the event. handler(this, e); } }
// Define what actions to take when the event is raised. private void HandleTimerEvent(object sender, TimerEventArgs e) { Console.WriteLine(e.Message); }