Updating GMap.NET Markers in C#

Question

I need to update my GMap.NET Markers in C#. I added my markers like below:

GMap.NET.WindowsForms.GMapMarker marker2 =
                new GMap.NET.WindowsForms.Markers.GMarkerGoogle(
                    new GMap.NET.PointLatLng(39.81750, 30.52686),
                    new Bitmap("hello.png"));
            marker2.ToolTipText = "Hello";
            marker2.ToolTip.Fill = Brushes.Black;
            marker2.ToolTip.Foreground = Brushes.White;
            marker2.ToolTip.Stroke = Pens.Black;
            markers.Markers.Add(marker2);
            gMapControl1.Overlays.Add(markers); 

I want to update this marker's position in a timer. How can i change this variable in a timer thread? Do i need to make these markers global variables? Thanks for answers.

Answer 1

You will need to pass the overlay into the timer:

System.Timers.Timer t = new System.Timers.Timer();
GMapOverlay overlay_ = new GMapOverlay();
//do stuff to your overlay
t.Elapsed += (sender, e) => MyElapsedMethod(sender, e, overlay_);

Your overlays are all references so you can simply update the markers and it should update on the map (assuming you have added it to the gmapcontrol):

static void MyElapsedMethod(object sender, System.Timers.ElapsedEventArgs e, GMapOverlay overlay) 
{
     overlay.Markers[..].Position = new PointLatLng(0,0); //for your new position
}

I have not tested this code, but I have good success doing something similar using a background worker.