NSManagedObjectContext.Notifications.ObserveWillSave Method
Definition
Important
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Overloads
| ObserveWillSave(EventHandler<NSNotificationEventArgs>) |
Strongly typed notification for the WillSaveNotification constant. |
| ObserveWillSave(NSObject, EventHandler<NSNotificationEventArgs>) |
Strongly typed notification for the WillSaveNotification constant. |
ObserveWillSave(EventHandler<NSNotificationEventArgs>)
Strongly typed notification for the WillSaveNotification constant.
public static Foundation.NSObject ObserveWillSave (EventHandler<Foundation.NSNotificationEventArgs> handler);static member ObserveWillSave : EventHandler<Foundation.NSNotificationEventArgs> -> Foundation.NSObjectParameters
- handler
- EventHandler<NSNotificationEventArgs>
Method to invoke when the notification is posted.
Returns
Token object that can be used to stop receiving notifications by either disposing it or passing it to RemoveObservers(IEnumerable<NSObject>)
Remarks
The following example shows how you can use this method in your code
//
// Lambda style
//
// listening
notification = NSManagedObjectContext.Notifications.ObserveWillSave ((sender, args) => {
/* Access strongly typed args */
Console.WriteLine ("Notification: {0}", args.Notification);
});
// To stop listening:
notification.Dispose ();
//
//Method style
//
NSObject notification;
void Callback (object sender, Foundation.NSNotificationEventArgs args)
{
// Access strongly typed args
Console.WriteLine ("Notification: {0}", args.Notification);
}
void Setup ()
{
notification = NSManagedObjectContext.Notifications.ObserveWillSave (Callback);
}
void Teardown ()
{
notification.Dispose ();
}
Applies to
ObserveWillSave(NSObject, EventHandler<NSNotificationEventArgs>)
Strongly typed notification for the WillSaveNotification constant.
public static Foundation.NSObject ObserveWillSave (Foundation.NSObject objectToObserve, EventHandler<Foundation.NSNotificationEventArgs> handler);static member ObserveWillSave : Foundation.NSObject * EventHandler<Foundation.NSNotificationEventArgs> -> Foundation.NSObjectParameters
- objectToObserve
- NSObject
The object to observe.
- handler
- EventHandler<NSNotificationEventArgs>
Method to invoke when the notification is posted.
Returns
Token object that can be used to stop receiving notifications by either disposing it or passing it to RemoveObservers(IEnumerable<NSObject>)
Remarks
This method can be used to subscribe for WillSaveNotification notifications.
// Listen to all notifications posted for any object
var token = NSManagedObjectContext.Notifications.ObserveWillSave ((notification) => {
Console.WriteLine ("Observed WillSaveNotification!");
};
// Listen to all notifications posted for a single object
var token = NSManagedObjectContext.Notifications.ObserveWillSave (objectToObserve, (notification) => {
Console.WriteLine ($"Observed WillSaveNotification for {nameof (objectToObserve)}!");
};
// Stop listening for notifications
token.Dispose ();