How to add Topology layer to map

Question

How would I use the SDK to add a Topology to my map as a layer?

This post from 2019 says its not possible.  I see the updated topo API stuff, but can't figure out how to automate adding one to my active map.

I've tried this but get the message:   "MyTopoName cannot be added as a layer"

Thanks,

tim

await QueuedTask.Run(() =>
                {
                    Map myMap = MapView.Active.Map;

Geodatabase myGDB = null;
                    var connFile = new DatabaseConnectionFile(new Uri(sdePath, UriKind.Absolute));
                    myGDB = new Geodatabase(connFile);

Topology myTopo = myGDB.OpenDataset<Topology>("MyTopoName");

Layer myLayer = LayerFactory.Instance.CreateLayer(myTopo.GetPath(), myMap);
                });

TimothySmith6 · Answer

Thanks so much for the follow up Wolf.    Looking foward to 3.1!

Wolf · Answer

Hi Tim,

The upcoming release 3.1 is capable of adding 'Topology layers' to the TOC.  I used this code snippet to test this:

var path = @"C:\Data\Topology\GrandTeton.gdb\BackCountry";
Uri uri = new Uri(path);
await QueuedTask.Run(() =>
{
  var item = ItemFactory.Instance.Create(uri.AbsolutePath);
  if (!LayerFactory.Instance.CanCreateLayerFrom(item)) return;
  var topoLyrParams = new TopologyLayerCreationParams(item);
  LayerFactory.Instance.CreateLayer<TopologyLayer>(topoLyrParams, MapView.Active.Map);
});

Both TopologyLayer and TopologyLayerCreationParams were added in 3.1 to support this functionality.

TimothySmith6 · Answer

Thanks for the follow up and confirmation Wolf.  We'll keep an eye out in later versions for a fix.

Thanks again,

tim