每x秒后在listview上填充项目

Question

I have a method that detects beacons after each 30 seconds. The scenario is as follows:

1. The scan period of beacons is 60 seconds.
2. The waiting period before the next scan is 30 seconds.

The above settings have already been defined in the BeaconDectector class. Now to display the beacons scanned on my UI, I have the following:

 private void Button_Clicked(object sender, EventArgs e)
 {       
    bool start = true; 
    while (start) {
       beaconsFound = StartDetection(); 
                Device.BeginInvokeOnMainThread(() =>
                  {
                      listView.ItemsSource = beaconsFound;

                  });
    }
 }

The StartDetection contains the logic that take place every 30 seconds and the scan period is 60 seconds. How can I ensure that I don't miss any beacons to get displayed on my listview?

Please advise. Thank you.

Answer 1

You should definitely not use active waiting while(start) to manage this. A better solution would be a Timer . You can see the basics for this in this blogpost .

Furthermore, ensure you are not running any long running code on the UI thread (which is what Button_Clicked runs on). Ideally, your timer should fire each 30 seconds, start a new Task for the detection and use Device.BeginInvokeOnMainThread to update the list when appropriate.