KnowledgeGraphLayer Class
A knowledge graph layer is a composite layer with a knowledge graph as its
data source.
Getting a Connection from a KnowledgeGraphLayer
var kgLayer = MapView.Active.Map.GetLayersAsFlattenedList()
.OfType<KnowledgeGraphLayer>().FirstOrDefault();
QueuedTask.Run(() =>
{
// use the layer directly
KnowledgeGraph datastore = kgLayer.GetDatastore();
// or you can use any of the sub items since
//KnowledgeGraphLayer is a composite layer - get the first
// child feature layer or standalone table
var featlayer = kgLayer?.GetLayersAsFlattenedList()?
.OfType<FeatureLayer>()?.FirstOrDefault();
KnowledgeGraph kg = null;
if (featlayer != null)
{
using (var fc = featlayer.GetFeatureClass())
kg = fc.GetDatastore() as KnowledgeGraph;
//TODO use KnowledgeGraph
}
else
{
//try standalone table
var stbl = kgLayer?.GetStandaloneTablesAsFlattenedList()?
.FirstOrDefault();
if (stbl != null)
{
using (var tbl = stbl.GetTable())
kg = tbl.GetDatastore() as KnowledgeGraph;
//TODO use KnowledgeGraph
}
}
});
Create a KG Layer containing all Entity and Relate types
QueuedTask.Run(() =>
{
//With a connection to a KG established or source uri available...
//Create a KnowledgeGraphLayerCreationParams
var kg_params = new KnowledgeGraphLayerCreationParams(kg)
{
Name = "KG_With_All_Types",
IsVisible = false
};
//Or
var kg_params2 = new KnowledgeGraphLayerCreationParams(new Uri(url))
{
Name = "KG_With_All_Types",
IsVisible = false
};
//Call layer factory with map or group layer container.
//A KG layer containing a feature layer and/or standalone table per
//entity and relate type (except provenance) is created
var kg_layer = LayerFactory.Instance.CreateLayer<KnowledgeGraphLayer>(
kg_params, map);
});
SubLayers of a KnowledgeGraph Layer
var map = MapView.Active.Map;
var kgLayer = map.GetLayersAsFlattenedList().OfType<KnowledgeGraphLayer>().FirstOrDefault();
if (kgLayer == null)
return;
if (map.MapType == MapType.LinkChart)
{
// if map is of MapType.LinkChart then the first level
// children of the kgLayer are of type LinkChartFeatureLayer
var childLayers = kgLayer.Layers;
foreach (var childLayer in childLayers)
{
if (childLayer is LinkChartFeatureLayer lcFeatureLayer)
{
var isEntity = lcFeatureLayer.IsEntity;
var isRel = lcFeatureLayer.IsRelationship;
// TODO - continue processing
}
}
}
else if (map.MapType == MapType.Map)
{
// if map is of MapType.Map then the children of the
// kgLayer are the standard Featurelayer and StandAloneTable
var chidlren = kgLayer.GetMapMembersAsFlattenedList();
foreach (var child in chidlren)
{
if (child is FeatureLayer fl)
{
// TODO - process the feature layer
}
else if (child is StandaloneTable st)
{
// TODO - process the standalone table
}
}
}
Target Platforms: Windows 11, Windows 10
ArcGIS Pro version: 3.2 or higher.