How to get Geometry from KmlNode

Question

Hello, I'm new with the ArcGIS SDK and try to find a way how to get the Geometry from a KmlNode, respectively from a kml file.

The general idea is to show to whole KmlNode structure from the kml file in a XAML TreeView and when you click on an item it should extract the Geometry.

Uri kmlUri = new Uri(path);
KmlDataset dataset = new KmlDataset(kmlUri);
KmlLayer layer = new KmlLayer(dataset);
MyMapView.Map.OperationalLayers.Add(layer);

foreach (KmlNode kmlRootNode in dataset.RootNodes)
{
  KmlPlacemark kmlPlacemark = kmlRootNode as KmlPlacemark;
  Geometry geometry = kmlPlacemark.Geometry;
}

I cast the KmlNode as a KmlPlacemark correctly, but the Geometry is ALWAYS null, I don't know why. Everything else like the GrahicType, the BalloonContent or the Extent of the KmlPlacemark are correct.

Does somebody have a hint for me what I am doing wrong or how I can solve this issue?

Thanks in advance.

RobWag · Answer

Cool, that helped a lot. Thank you very much.

SomeGISGuy · Answer

Try the .Geometries property instead. They are slightly different. See the doc:

RobWag · Answer

Hi,

thanks for your reply. For the sake of simplicity I only copy & pasted the important parts of the code.

The more detailed code would be:

I first load the kml file with an open file dialog. And when the loading succeeds, I create the dataset and the layer:

string path = openFileDialog.FileName;
Uri kmlUri = new Uri(path);
KmlDataset dataset = new KmlDataset(kmlUri);
KmlLayer layer = new KmlLayer(dataset);
MyMapView.Map.OperationalLayers.Add(layer);
await LoadKmlData(dataset);

The method LoadKmlData would add all the KmlNodes to the WPF/XAML TreeView:

await dataset.LoadAsync();
foreach (KmlNode kmlRootNode in dataset.RootNodes)
{
   TreeViewItem treeViewItem = new TreeViewItem(kmlRootNode, null);
   treeViewItems.Add(treeViewItem);
   TreeViewItem.AddChildrenItemsToRootItem(treeViewItem);
}
TreeView.ItemsSource = treeViewItems;

The TreeView shows all the items from my kml file correctly. When I click on a TreeView item, I would like to get the Geometry of that item by the Event handler TreeView_SelectedItemChanged:

TreeViewItem selectedItem = e.NewValue as TreeViewItem;
if(selectedItem != null)
{
   KmlNode node = selectedItem.Node;
   if(node.GetType() == typeof(KmlPlacemark))
   {
      Geometry geometry = ((KmlPlacemark)node).Geometry;
   }
}

But unfortunately the geometry is null.