Hello,
I’m trying to load a 450MB .mbtiles file coupled with a pre-delivered JSON-Style.
I’m using the following dataset:
- https://vectortiles.geo.admin.ch/styles/ch.swisstopo.leichte-basiskarte.vt/style.json
- https://vectortiles.geo.admin.ch/tiles/ch.swisstopo.leichte-basiskarte.vt/v3.0.0/ch.swisstopo.leichte-basiskarte.vt.mbtiles
And here below is my code, which throws a NullreferenceException (see below codebase) when trying to load the map/style.
Can you please tell me if I’m doing something wrong or if the library has some problems with the provided data?
I tested both json and .mbtiles with QGIS and Maptiler, and they work fine.
Thanks!
private void MapView_Loaded(object sender, RoutedEventArgs e)
{
// It is important to set the map unit first to either feet, meters or decimal degrees.
mapView.MapUnit = GeographyUnit.Meter;
// Create a new overlay that will hold our new layer
LayerOverlay layerOverlay = new LayerOverlay();
// Create the background world maps using vector tiles stored locally in our MBTiles file and also set the styling though a json file
ThinkGeoMBTilesLayer mbTilesLayer = new ThinkGeoMBTilesLayer( @"E:\Desktop-Maps\ThinkGeoVectorTiles\Resources\ch.swisstopo.leichte-basiskarte.vt.mbtiles", new Uri(@"E:\Desktop-Maps\ThinkGeoVectorTiles\Resources\leichte-basiskarte.json"));
mbTilesLayer.Projection = new Projection(2056);
layerOverlay.Layers.Add(mbTilesLayer);
try {
layerOverlay.Open();
// Add the overlay to the map
mapView.Overlays.Add(layerOverlay);
// Set the current extent of the map to an area in the data
mapView.CurrentExtent = mbTilesLayer.GetBoundingBox();
layerOverlay.Close();
} catch(Exception ex) {
Console.WriteLine(ex.StackTrace);
}
// Refresh the map.
mapView.Refresh();
}
An unhandled exception of type ‘System.ArgumentNullException’ occurred in ThinkGeo.Core.dll: ‘Value cannot be null.’
at System.ThrowHelper.ThrowArgumentNullException(ExceptionArgument argument)
at System.Collections.Generic.List1.InsertRange(Int32 index, IEnumerable1 collection)
at EhU=.9zI=.9TI=(JObject jsonObject)
at EhU=.9zI=.hxU=(JObject jsonObject)
at ThinkGeo.Core.StyleJsonDocument.Parse(Byte[] styleJsonBytes)
at ThinkGeo.Core.ThinkGeoMBTilesLayer.lCs=()
at ThinkGeo.Core.ThinkGeoMBTilesLayer.OpenCore()
at ThinkGeo.Core.Layer.Open()
at ThinkGeo.Core.LayerOverlay.OpenCore()
at ThinkGeo.Core.Overlay.Open()
at ThinkGeoVectorTiles.MainWindow.MapView_Loaded(Object sender, RoutedEventArgs e) in E:\POCS\Desktop-Maps\ThinkGeoVectorTiles\MainWindow.xaml.cs:line 46
at System.Windows.RoutedEventHandlerInfo.InvokeHandler(Object target, RoutedEventArgs routedEventArgs)
at System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised)
at System.Windows.UIElement.RaiseEventImpl(DependencyObject sender, RoutedEventArgs args)
at System.Windows.UIElement.RaiseEvent(RoutedEventArgs e)
at System.Windows.BroadcastEventHelper.BroadcastEvent(DependencyObject root, RoutedEvent routedEvent)
at System.Windows.BroadcastEventHelper.BroadcastLoadedEvent(Object root)
at System.Windows.Media.MediaContext.FireLoadedPendingCallbacks()
at System.Windows.Media.MediaContext.FireInvokeOnRenderCallbacks()
at System.Windows.Media.MediaContext.RenderMessageHandlerCore(Object resizedCompositionTarget)
at System.Windows.Media.MediaContext.RenderMessageHandler(Object resizedCompositionTarget)
at System.Windows.Media.MediaContext.Resize(ICompositionTarget resizedCompositionTarget)
at System.Windows.Interop.HwndTarget.OnResize()
at System.Windows.Interop.HwndTarget.HandleMessage(WindowMessage msg, IntPtr wparam, IntPtr lparam)
at System.Windows.Interop.HwndSource.HwndTargetFilterMessage(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
at MS.Win32.HwndWrapper.WndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
at MS.Win32.HwndSubclass.DispatcherCallbackOperation(Object o)
at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler)
at System.Windows.Threading.Dispatcher.LegacyInvokeImpl(DispatcherPriority priority, TimeSpan timeout, Delegate method, Object args, Int32 numArgs)
at MS.Win32.HwndSubclass.SubclassWndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam)