Question

我有一个活动，当应用程序处于活动状态时会触发，我会收到通知gulp compileUnit --page about。在此功能中，我想找出当前显示的页面，以了解通知是否应更新页面上的内容。因此，问题是双重的，如何知道当前显示哪个页面并与Toast通知进行交互。

更新问题是由于与OS线程（Dispatcher）的冲突，我无法与元素交互。

因此，使用下面的代码，它允许我访问消息的内容。但我仍然无法获得current_page的信息

CurrentChannel_PushNotificationReceived

private void OnPushNotificationReceived（PushNotificationChannel sender，PushNotificationReceivedEventArgs args） { switch（args.NotificationType） { case PushNotificationType.Badge： this.OnBadgeNotificationReceived（args.BadgeNotification.Content.GetXml（））; 打破;

  _channel = await PushNotificationChannelManager.CreatePushNotificationChannelForApplicationAsync();
_channel.PushNotificationReceived += OnPushNotificationReceived;

问题

如何访问不同case PushNotificationType.Tile: this.OnTileNotificationReceived(args.TileNotification.Content.GetXml()); break; case PushNotificationType.Toast: this.OnToastNotificationReceived(args.ToastNotification.Content.GetXml()); break; case PushNotificationType.Raw: this.OnRawNotificationReceived(args.RawNotification.Content); break; } args.Cancel = true; } private void OnBadgeNotificationReceived(string notificationContent) { // Code when a badge notification is received when app is running } private void OnTileNotificationReceived(string notificationContent) { // Code when a tile notification is received when app is running } private void OnToastNotificationReceived(string notificationContent) { // Code when a toast notification is received when app is running // Show a toast notification programatically var xmlDocument = new XmlDocument(); xmlDocument.LoadXml(notificationContent); var toastNotification = new ToastNotification(xmlDocument); //toastNotification.SuppressPopup = true; ToastNotificationManager.CreateToastNotifier().Show(toastNotification); } private void OnRawNotificationReceived(string notificationContent) { // Code when a raw notification is received when app is running }中的当前页面信息。当前的片段有效但不在这些功能范围内：

onXXXXNotificationReceived

或

var currentPage = ((PhoneApplicationFrame)Application.Current.RootVisual).Content;
        var tempBool = currentPage.GetType() is BC_Menu.StartUp.SecondScreen;

我的猜测是因为UI线程。那么如何使用调度程序获取信息呢？我已经向调度员尝试了一些解决方案，但我不能等待这些信息，因此不适用。

RootFrame.CurrentSource;

Answer 1

没有理由等待调度程序到UI线程。只需调度到UI线程，然后执行其余逻辑，例如在UI线程中显示toast或导航到页面......

注册活动......

var channel = await PushNotificationChannelManager.CreatePushNotificationChannelForApplicationAsync();
channel.PushNotificationReceived += Channel_PushNotificationReceived;

在事件处理程序上，取消显示通知，然后分派到UI线程......

private void Channel_PushNotificationReceived(PushNotificationChannel sender, PushNotificationReceivedEventArgs args)
{
    // Make sure you cancel displaying the toast on this thread (not on UI thread)
    // since cancellation needs to be set before this thread/method returns
    args.Cancel = true;

    // Then dispatch to the UI thread
    App.RootFrame.Dispatcher.BeginInvoke(delegate
    {
        var currPage = ((PhoneApplicationFrame)Application.Current.RootVisual).Content;

        switch (args.NotificationType)
        {
            case PushNotificationType.Toast:
                // TODO
                break;
        }
    });
}

在调度程序的委托中执行所有代码。您的所有代码都将在UI线程上执行...您将能够导航页面，获取当前页面等。

Answer 2

确定。试试这个。在App.xaml.cs上创建一个静态属性。

public static object CurrentPageInfo { get; set; }

并将页面类型或页面名称分配给＆＃39; OnNavigatedTo＆＃39;每页的方法。

protected override void OnNavigatedTo(NavigationEventArgs e)
{
  base.OnNavigatedTo(e);
  var currentPage = ((PhoneApplicationFrame)Application.Current.RootVisual).Content;
  App.CurrentPageInfo = currentPage.GetType() is BC_Menu.StartUp.SecondScreen;
}

通过访问App.CurrentPageInfo属性，您可以在接收通知时识别页面源类型。希望它有所帮助！

收到Toast通知时获取当前页面（WP8.1 Silverlight，接收WNS Toast通知）

2 个答案: