共用方式為


NSMetadataQuery.Notifications.ObserveGatheringProgress 方法

定義

多載

ObserveGatheringProgress(EventHandler<NSNotificationEventArgs>)

常數的 GatheringProgressNotification 強型別通知。

ObserveGatheringProgress(NSObject, EventHandler<NSNotificationEventArgs>)

常數的 GatheringProgressNotification 強型別通知。

ObserveGatheringProgress(EventHandler<NSNotificationEventArgs>)

常數的 GatheringProgressNotification 強型別通知。

public static Foundation.NSObject ObserveGatheringProgress (EventHandler<Foundation.NSNotificationEventArgs> handler);
static member ObserveGatheringProgress : EventHandler<Foundation.NSNotificationEventArgs> -> Foundation.NSObject

參數

handler
EventHandler<NSNotificationEventArgs>

張貼通知時叫用的方法。

傳回

權杖物件,可用來停止接收通知,方法是處置通知或傳遞至 RemoveObservers(IEnumerable<NSObject>)

備註

下列範例示範如何在程式碼中使用此方法

//
// Lambda style
//

// listening
notification = NSMetadataQuery.Notifications.ObserveGatheringProgress ((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 = NSMetadataQuery.Notifications.ObserveGatheringProgress (Callback);
}

void Teardown ()
{
    notification.Dispose ();
}

適用於

ObserveGatheringProgress(NSObject, EventHandler<NSNotificationEventArgs>)

常數的 GatheringProgressNotification 強型別通知。

public static Foundation.NSObject ObserveGatheringProgress (Foundation.NSObject objectToObserve, EventHandler<Foundation.NSNotificationEventArgs> handler);
static member ObserveGatheringProgress : Foundation.NSObject * EventHandler<Foundation.NSNotificationEventArgs> -> Foundation.NSObject

參數

objectToObserve
NSObject

要觀察的物件。

handler
EventHandler<NSNotificationEventArgs>

張貼通知時叫用的方法。

傳回

權杖物件,可用來停止接收通知,方法是處置通知或傳遞至 RemoveObservers(IEnumerable<NSObject>)

備註

這個方法可用來訂閱 GatheringProgressNotification 通知。

// Listen to all notifications posted for any object
var token = NSMetadataQuery.Notifications.ObserveGatheringProgress ((notification) => {
	Console.WriteLine ("Observed GatheringProgressNotification!");
};

// Listen to all notifications posted for a single object
var token = NSMetadataQuery.Notifications.ObserveGatheringProgress (objectToObserve, (notification) => {
	Console.WriteLine ($"Observed GatheringProgressNotification for {nameof (objectToObserve)}!");
};

// Stop listening for notifications
token.Dispose ();

適用於