The value of watcher.position.location is always unknow (C#|gmap|visualstudio2019)

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C#

Watcher = new GeoCoordinateWatcher();
// Start the watcher.
if (Watcher.TryStart(false, TimeSpan.FromSeconds(3)))
{
    MessageBox.Show(Watcher.Position.Location.ToString()); //Always 'Unknow'
}
else
{
    // Position not found after 3 seconds...
}

What I have tried:

C#

Watcher = new GeoCoordinateWatcher();
// Start the watcher.
if (Watcher.TryStart(false, TimeSpan.FromSeconds(3)))
{
    MessageBox.Show(Watcher.Position.Location.ToString()); //Always 'Unknow'
}
else
{
    // Position not found after 3 seconds...
}

Posted 17-Nov-21 23:47pm

-Luca Giacomelli

Updated 21-Nov-21 2:51am

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Comments

phil.o 18-Nov-21 7:15am

You should check the provider, as it seems that no data can be retrieved.

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#realJSOP · Answer 1 · 2021-11-21T02:51:00

You appear to be using it wrong. Furthermore, you can't use MessageBox to display the position because you'll be forced to keep hitting OK to dismiss the dialog.

private GeoCoordinateWatcher watcher = new GeoCoordinateWatcher();
private bool watcherStarted = false;

public void MakeCoordWatcher(int seconds)
{
    if (!eventWatched)
    {
        this.watcherwatcher.PositionChanged += new EventHandler<GeoPositionChangedEventArgs<GeoCoordinate>>(watcher_PositionChanged);
        this.watcherStarted = this.watcher.TryStart(false, TimeSpan.FromMilliseconds(seconds*1000));
        if (!started)
        {
            MessageBox.Show("GeoCoordinateWatcher timed out on start.");
        }
    }
}

private void watcher_PositionChanged(object sender, GeoPositionChangedEventArgs<GeoCoordinate> e)
{
    // Do something with the position data
    Debug.WriteLine("Lat: {0}, Long {1}", e.Position.Location.Latitude, e.Position.Location.Longitude);
}

How you display the watcher updates is up to you, and since you're using MessageBox, I'm assuming the app has a UI, so I would probably create a status bar that is updated by the event handler. Since I have no idea how your app is architechted, I leave that decision up to you.