GMap.NET route is returning null

Question

I'm working on a programme with C# and I want to calculate the route, but it's returning null.

Here's my code ;

PointLatLng start = new PointLatLng(38.481858, 27.089006);
PointLatLng end = new PointLatLng(38.468447, 27.113793);

MapRoute route = GMap.NET.MapProviders.GoogleMapProvider
                                      .Instance.GetRoute(start, end, false, false, 15);
GMapRoute r = new GMapRoute(route.Points , "My route");
GMapOverlay routeOverlay = new GMapOverlay("route");
routeOverlay.Routes.Add(r);
gMap.Overlays.Add(routeOverlay);
double distance;
distance = route.Distance;

r.Stroke.Width = 2;
r.Stroke.Color = Color.OrangeRed;

I don't know where I am making mistakes. Any kind of help would be appreciated.

Agnes

Have you tried passing in the strings of the adresses? – Gavage

@Gavage can you give me an example please? – Agnes

try this ::if (route == null) { List lstPoints = new List {start ,end}; route = new MapRoute (lstPoints); – Tussis

GoogleMapProvider.Instance.GetRoute("broadway, new york city", "15th street, new york city", false, false, 15); – Gavage

@Gavage it also returns null plus I have to work with coordinates.. – Agnes

@Tussis it didn't work.. – Agnes

what does it mean "didnt work" ? U get null exception again?? – Tussis

@Tussis MapRoute only accepts MapRoute(string) – Agnes

@nozzleman,sakir, I found the problem.. The routing service was been removed by google recently.. – Agnes

is there any workaround? – Gavage

@Gavage If you don't need to get the route's distance value, you can use GetDirections. I couldn't manage to find any other solutions on WinForm using Google Map Service, but now I'm using BingMapProvider with Devexpress Extension on VS – Agnes

Answer 1

The problem is solved.. The reason why route returns null is because the routing service was been removed by google.

Agnes

What is the replacment then? – Fellowship

Answer 2

GDirections ss;
var xx = GMapProviders.GoogleMap.GetDirections(out ss, start, end, false, false, false, false, false);
GMapRoute r = new GMapRoute(ss.Route, "My route");

Try this...

Money

I was trying to get the distance from the route, I don't need directions but thanks for suggestion – Agnes

@Vinicious Did this code work for you?On codeplex forums they told me that google has removed routing service. link – Agnes

this give Object reference not set to an instance of an object.' on this line: GMapRoute r = new GMapRoute(ss.Route, "My route"); – Fellowship

This gives me the same error - ss ends up being null. – Lock

Answer 3

Your Api key is invalid Add GMap from nuget use this code :

 public static double GetDistanceByRoute(double startLat, double startLng, double endLat, double endLng)
    {
        GoogleMapProvider.Instance.ApiKey = "Your Api Key";
        PointLatLng start = new PointLatLng(startLat, startLng);
        PointLatLng end = new PointLatLng(endLat, endLng);
        MapRoute route = GMap.NET.MapProviders.GoogleMapProvider.Instance.GetRoute(start, end, false, false, 15);
        return route.Distance;
    }

Mirabel

Answer 4

        PointLatLng startp = new PointLatLng(-25.974134, 32.593042);
        PointLatLng endp = new PointLatLng(-25.959048, 32.592827);
        MapRoute route = BingMapProvider.Instance.GetRoute(startp, endp, false, false, 15);
        GMapRoute r = new GMapRoute(route.Points,"Myroutes");
        GMapOverlay routesOverlay = new GMapOverlay("Myroutes");
        routesOverlay.Routes.Add(r);
        gmap.Overlays.Add(routesOverlay);
        r.Stroke.Width = 2;
        r.Stroke.Color = Color.SeaGreen; 

//use BingMapProvider

Mandeville

Answer 5

Your API key is missing, i had the same problem, added the api key and it works fine.

Wretch