更新 Xamarin.Android 上的通知文本

如何解决更新 Xamarin.Android 上的通知文本

        public void StartAppService()
        {
            ...

            using (var intent = new Intent(Application.Context,typeof(RunningAppService)))
            {
                Application.Context.StartForegroundService(intent);
            }
        }

        private const int ServiceRunningNotificationId = 10000;

        public override StartCommandResult OnStartCommand(Intent intent,StartCommandFlags flags,int startId)
        {
            CreateNotificationChannel();

            using (var notification = new Notification.Builder(this,"10111")
                .SetContentTitle("Artemis HZ")
                .SetContentText("90 HZ")
                .SetSmallIcon(Resource.Drawable.icon)
                .Setongoing(true)
                .Build())
            {
                StartForeground(ServiceRunningNotificationId,notification);
            }

            ...

            return StartCommandResult.Sticky;
        }

        private void CreateNotificationChannel()
        {
            const string channelName = "TopAppServiceChannel";
            const string channelDescription = "TopAppServiceChannel";
            using (var channel = new NotificationChannel("10111",channelName,NotificationImportance.Default)
            {
                Description = channelDescription
            })
            {
                using (var notificationmanager = (notificationmanager)GetSystemService(NotificationService))
                {
                    notificationmanager?.CreateNotificationChannel(channel);
                }
            }
        }

我想以编程方式更改它的 SetContentText。我试着这样做：

                using (var notificationBuilder = new Notification.Builder(this,"10111")
                    .SetContentText($"{(int)hz} HZ"))
                {
                    using (var notificationmanager = (notificationmanager)GetSystemService(NotificationService))
                    {
                        notificationmanager?.Notify(10111,notificationBuilder.Build());
                    }
                }

然后什么也没有发生。它只在应用启动的前几秒有效，但之后它就保持原样，不会再次改变。