Windows 10(UWP)中的TimeTrigger/Scheduler不到15分钟

以下是在10秒内安排祝酒的示例代码.

namespace UWPApp
{
    /// <summary>
    /// An empty page that can be used on its own or navigated to within a Frame.
    /// </summary>
    public sealed partial class MainPage : Page
    {
        private Random random = new Random((int)DateTime.Now.Ticks);

        const string TOAST = @"
<toast>
  <visual>
    <binding template=""ToastGeneric"">
      <text>Sample</text>
      <text>This is a simple toast notification example</text>
      <image placement = ""AppLogoOverride"" src=""oneAlarm.png"" />
    </binding>
  </visual>
  <actions>
    <action content = ""check"" arguments=""check"" imageUri=""check.png"" />
    <action content = ""cancel"" arguments=""cancel""/>
  </actions>
  <audio src =""ms-winsoundevent:Notification.Reminder""/>
</toast>";


        public MainPage()
        {
            this.InitializeComponent();
        }

        private void Button_Click(object sender,RoutedEventArgs e)
        {
            var when = DateTime.Now.AddSeconds(10);

            var offset = new DateTimeOffset(when);

            Windows.Data.Xml.Dom.XmlDocument xml = new Windows.Data.Xml.Dom.XmlDocument();

            xml.LoadXml(TOAST);

            ScheduledToastNotification toast = new ScheduledToastNotification(xml,offset);

            toast.Id = random.Next(1,100000000).ToString();

            ToastNotificationManager.CreateToastNotifier().AddToSchedule(toast);
        }
    }
}