ObjectID Property (FeatureInfo)
The object ID of the parent feature.
public long ObjectID {get;}
Public ReadOnly Property ObjectID As Long
ExploreTopologyGraph
public void ExploreTopologyGraph()
{
using (Geodatabase geodatabase = new Geodatabase(new FileGeodatabaseConnectionPath(new Uri(@"C:\TestData\GrandTeton.gdb"))))
using (Topology topology = geodatabase.OpenDataset<Topology>("Backcountry_Topology"))
{
// Build a topology graph using the extent of the topology dataset.
topology.BuildGraph(topology.GetExtent(), (topologyGraph) =>
{
using (Feature campsites12 = GetFeature(geodatabase, "Campsites", 12))
{
IReadOnlyList<TopologyNode> topologyNodesViaCampsites12 = topologyGraph.GetNodes(campsites12);
TopologyNode topologyNodeViaCampsites12 = topologyNodesViaCampsites12[0];
IReadOnlyList<TopologyEdge> allEdgesConnectedToNodeViaCampsites12 = topologyNodeViaCampsites12.GetEdges();
IReadOnlyList<TopologyEdge> allEdgesConnectedToNodeViaCampsites12CounterClockwise = topologyNodeViaCampsites12.GetEdges(false);
System.Diagnostics.Debug.Assert(allEdgesConnectedToNodeViaCampsites12.Count == allEdgesConnectedToNodeViaCampsites12CounterClockwise.Count);
foreach (TopologyEdge edgeConnectedToNodeViaCampsites12 in allEdgesConnectedToNodeViaCampsites12)
{
TopologyNode fromNode = edgeConnectedToNodeViaCampsites12.GetFromNode();
TopologyNode toNode = edgeConnectedToNodeViaCampsites12.GetToNode();
bool fromNodeIsTheSameAsTopologyNodeViaCampsites12 = (fromNode == topologyNodeViaCampsites12);
bool toNodeIsTheSameAsTopologyNodeViaCampsites12 = (toNode == topologyNodeViaCampsites12);
System.Diagnostics.Debug.Assert(fromNodeIsTheSameAsTopologyNodeViaCampsites12 || toNodeIsTheSameAsTopologyNodeViaCampsites12,
"The FromNode *or* ToNode of each edge connected to 'topologyNodeViaCampsites12' should be the same as 'topologyNodeViaCampsites12' itself.");
IReadOnlyList<FeatureInfo> leftParentFeaturesBoundedByEdge = edgeConnectedToNodeViaCampsites12.GetLeftParentFeatures();
foreach (FeatureInfo featureInfo in leftParentFeaturesBoundedByEdge)
{
System.Diagnostics.Debug.Assert(!String.IsNullOrEmpty(featureInfo.FeatureClassName));
System.Diagnostics.Debug.Assert(featureInfo.ObjectID > 0);
EnsureShapeIsNotEmpty(featureInfo);
}
IReadOnlyList<FeatureInfo> leftParentFeaturesNotBoundedByEdge = edgeConnectedToNodeViaCampsites12.GetLeftParentFeatures(false);
foreach (FeatureInfo featureInfo in leftParentFeaturesNotBoundedByEdge)
{
System.Diagnostics.Debug.Assert(!String.IsNullOrEmpty(featureInfo.FeatureClassName));
System.Diagnostics.Debug.Assert(featureInfo.ObjectID > 0);
EnsureShapeIsNotEmpty(featureInfo);
}
IReadOnlyList<FeatureInfo> rightParentFeaturesBoundedByEdge = edgeConnectedToNodeViaCampsites12.GetRightParentFeatures();
foreach (FeatureInfo featureInfo in rightParentFeaturesBoundedByEdge)
{
System.Diagnostics.Debug.Assert(!String.IsNullOrEmpty(featureInfo.FeatureClassName));
System.Diagnostics.Debug.Assert(featureInfo.ObjectID > 0);
EnsureShapeIsNotEmpty(featureInfo);
}
IReadOnlyList<FeatureInfo> rightParentFeaturesNotBoundedByEdge = edgeConnectedToNodeViaCampsites12.GetRightParentFeatures(false);
foreach (FeatureInfo featureInfo in rightParentFeaturesNotBoundedByEdge)
{
System.Diagnostics.Debug.Assert(!String.IsNullOrEmpty(featureInfo.FeatureClassName));
System.Diagnostics.Debug.Assert(featureInfo.ObjectID > 0);
EnsureShapeIsNotEmpty(featureInfo);
}
}
}
});
}
}
private void EnsureShapeIsNotEmpty(FeatureInfo featureInfo)
{
using (Feature feature = featureInfo.GetFeature())
{
System.Diagnostics.Debug.Assert(!feature.GetShape().IsEmpty, "The feature's shape should not be empty.");
}
}
FindClosestElement
public void FindClosestElement()
{
using (Geodatabase geodatabase = new Geodatabase(new FileGeodatabaseConnectionPath(new Uri(@"C:\TestData\GrandTeton.gdb"))))
using (Topology topology = geodatabase.OpenDataset<Topology>("Backcountry_Topology"))
{
// Build a topology graph using the extent of the topology dataset.
topology.BuildGraph(topology.GetExtent(), (topologyGraph) =>
{
MapPoint queryPointViaCampsites12 = null;
using (Feature campsites12 = GetFeature(geodatabase, "Campsites", 12))
{
queryPointViaCampsites12 = campsites12.GetShape() as MapPoint;
}
double searchRadius = 1.0;
TopologyElement topologyElementViaCampsites12 =
topologyGraph.FindClosestElement<TopologyElement>(
queryPointViaCampsites12, searchRadius);
System.Diagnostics.Debug.Assert(
topologyElementViaCampsites12 != null, "There should be a topology element corresponding to 'queryPointViaCampsites12' within the 'searchRadius' units.");
IReadOnlyList<FeatureInfo> parentFeatures = topologyElementViaCampsites12.GetParentFeatures();
Console.WriteLine("The parent features that spawn 'topologyElementViaCampsites12' are:");
foreach (FeatureInfo parentFeature in parentFeatures)
{
Console.WriteLine($"\t{parentFeature.FeatureClassName}; OID: {parentFeature.ObjectID}");
}
TopologyNode topologyNodeViaCampsites12 = topologyGraph.FindClosestElement<TopologyNode>(queryPointViaCampsites12, searchRadius);
if (topologyNodeViaCampsites12 != null)
{
// There exists a TopologyNode nearest to the query point within searchRadius units.
}
TopologyEdge topologyEdgeViaCampsites12 = topologyGraph.FindClosestElement<TopologyEdge>(queryPointViaCampsites12, searchRadius);
if (topologyEdgeViaCampsites12 != null)
{
// There exists a TopologyEdge nearest to the query point within searchRadius units.
}
});
}
}
Target Platforms: Windows 11, Windows 10
ArcGIS Pro version: 3 or higher.