PdfDocument.Notifications.ObserveDidBeginPageWrite 方法
定义
重要
一些信息与预发行产品相关，相应产品在发行之前可能会进行重大修改。 对于此处提供的信息，Microsoft 不作任何明示或暗示的担保。
重载
ObserveDidBeginPageWrite(EventHandler<NSNotificationEventArgs>)
常量的强类型通知 DidBeginPageWriteNotification 。
public static Foundation.NSObject ObserveDidBeginPageWrite (EventHandler<Foundation.NSNotificationEventArgs> handler);static member ObserveDidBeginPageWrite : EventHandler<Foundation.NSNotificationEventArgs> -> Foundation.NSObject参数
- handler
- EventHandler<NSNotificationEventArgs>
发布通知时调用的方法。
返回
令牌对象，可用于停止接收通知，方法是释放通知或将其传递给 RemoveObservers(IEnumerable<NSObject>)
注解
此方法可用于订阅 DidBeginPageWriteNotification 通知。
// Listen to all notifications posted for any object
var token = PdfDocument.Notifications.ObserveDidBeginPageWrite ((notification) => {
Console.WriteLine ("Observed DidBeginPageWriteNotification!");
};
// Listen to all notifications posted for a single object
var token = PdfDocument.Notifications.ObserveDidBeginPageWrite (objectToObserve, (notification) => {
Console.WriteLine ($"Observed DidBeginPageWriteNotification for {nameof (objectToObserve)}!");
};
// Stop listening for notifications
token.Dispose ();
适用于
ObserveDidBeginPageWrite(NSObject, EventHandler<NSNotificationEventArgs>)
常量的强类型通知 DidBeginPageWriteNotification 。
public static Foundation.NSObject ObserveDidBeginPageWrite (Foundation.NSObject objectToObserve, EventHandler<Foundation.NSNotificationEventArgs> handler);static member ObserveDidBeginPageWrite : Foundation.NSObject * EventHandler<Foundation.NSNotificationEventArgs> -> Foundation.NSObject参数
- objectToObserve
- NSObject
要观察的对象。
- handler
- EventHandler<NSNotificationEventArgs>
发布通知时调用的方法。
返回
令牌对象，可用于停止接收通知，方法是释放通知或将其传递给 RemoveObservers(IEnumerable<NSObject>)
注解
此方法可用于订阅 DidBeginPageWriteNotification 通知。
// Listen to all notifications posted for any object
var token = PdfDocument.Notifications.ObserveDidBeginPageWrite ((notification) => {
Console.WriteLine ("Observed DidBeginPageWriteNotification!");
};
// Listen to all notifications posted for a single object
var token = PdfDocument.Notifications.ObserveDidBeginPageWrite (objectToObserve, (notification) => {
Console.WriteLine ($"Observed DidBeginPageWriteNotification for {nameof (objectToObserve)}!");
};
// Stop listening for notifications
token.Dispose ();