I have problem when I use the Online Rote tak to find the shortest driving distance. The OnlineRouteTask class throws an exception 'System.ArgumentNullException: A value can not be null' in the function 'SolveAsync'. I have tried to set/change all the parameters in the call with no luck. It used to work, so I am a little puzzled. Here is my code: async Task<double> FindDistance(double fromLat, double fromLon, double toLat, double toLon) { double distance = -1; try { const string RouteUrl = "http://route.arcgis.com/arcgis/rest/services/World/Route/NAServer/Route_World"; var fromPoint = new MapPoint(fromLon, fromLat, SpatialReferences.Wgs84); var fromSym = new SimpleMarkerSymbol { Style = SimpleMarkerStyle.X, Size = 10, Color = Colors.Green }; var fromMapGraphic = new Graphic { Geometry = fromPoint, Symbol = fromSym }; var toPoint = new MapPoint(toLon, toLat, SpatialReferences.Wgs84); var toSym = new SimpleMarkerSymbol { Style = SimpleMarkerStyle.X, Size = 10, Color = Colors.GreenYellow }; var toMapGraphic = new Graphic { Geometry = toPoint, Symbol = toSym }; var routeTask = new OnlineRouteTask(new Uri(RouteUrl)); var routeParams = await routeTask.GetDefaultParametersAsync(); //routeParams.OutSpatialReference = ihmMapView.SpatialReference; //routeParams.DirectionsLengthUnit = LinearUnits.Kilometers; routeParams.ReturnDirections = false; routeParams.OutputLines = OutputLine.None; //routeParams.ReturnPointBarriers = true; //routeParams.FindBestSequence = true; var restrictions = new List<string>(); restrictions.Add("Avoid Ferries"); restrictions.Add("Driving an Emergency Vehicle"); routeParams.RestrictionAttributeNames = restrictions; var stopGraphics = new List<Graphic>(); stopGraphics.Add(fromMapGraphic); stopGraphics.Add(toMapGraphic); routeParams.SetStops(stopGraphics); var routeResult = await routeTask.SolveAsync(routeParams); <--- Exception is thrown here foreach (var de in routeResult.Routes[0].TotalCosts) { if (de.Key == "Kilometers") { distance = de.Value; break; } } } catch (Exception e) { log.Error(e); } return distance; } The Exception: ERROR - System.ArgumentNullException: A value can not be null. Parameternavn: source ved System.Linq.Enumerable.Where[TSource](IEnumerable`1 source, Func`2 predicate) ved Esri.ArcGISRuntime.Tasks.NetworkAnalyst.NetworkDescription.GetTimeAndLengthAttributes(NAParameters parameters, String& timeAttribute, String& lengthAttribute) ved Esri.ArcGISRuntime.Tasks.NetworkAnalyst.NAParameters.GetParameters(NetworkDescription networkDescription, Boolean autoNormalize) ved Esri.ArcGISRuntime.Tasks.NetworkAnalyst.RouteParameters.GetParameters(NetworkDescription networkDescription, Boolean autoNormalize) ved Esri.ArcGISRuntime.Tasks.NetworkAnalyst.OnlineRouteTask.<SolveRequest>d__17.MoveNext() --- Afslutningen på staksporingen fra den tidligere placering, hvor undtagelsen blev udløst --- ved System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) ved System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) ved Esri.ArcGISRuntime.Tasks.NetworkAnalyst.OnlineRouteTask.<Solve>d__12.MoveNext() --- Afslutningen på staksporingen fra den tidligere placering, hvor undtagelsen blev udløst --- ved System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) ved System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) ved System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd(Task task) ved InformiGis.IhmMapControl.<FindDistance>d__106.MoveNext() <--- This is my function
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