ArcGIS Pro 2.7 API Reference Guide
GetFeatureClassNames Method
Example 

ArcGIS.Core.Data.Topology Namespace > TopologyDefinition Class : GetFeatureClassNames Method
Gets the name of all the ArcGIS.Core.Data.FeatureClasss that participate in the Topology. This method must be called on the MCT. Use QueuedTask.Run.
Syntax
public IReadOnlyList<string> GetFeatureClassNames()
Public Function GetFeatureClassNames() As IReadOnlyList(Of String)

Return Value

The name of all the ArcGIS.Core.Data.FeatureClasss that participate in the Topology.
Exceptions
ExceptionDescription
A geodatabase-related exception has occurred.
Example
public void OpenTopologyAndProcessDefinition()
{
  // Open a geodatabase topology from a file geodatabase and process the topology definition.

  using (Geodatabase geodatabase = new Geodatabase(new FileGeodatabaseConnectionPath(new Uri(@"C:\TestData\GrandTeton.gdb"))))
  using (Topology topology = geodatabase.OpenDataset<Topology>("Backcountry_Topology"))
  {
    ProcessDefinition(geodatabase, topology);
  }

  // Open a feature service topology and process the topology definition.

  const string TOPOLOGY_LAYER_ID = "0";

  using (Geodatabase geodatabase = new Geodatabase(new ServiceConnectionProperties(new Uri("https://sdkexamples.esri.com/server/rest/services/GrandTeton/FeatureServer"))))
  using (Topology topology = geodatabase.OpenDataset<Topology>(TOPOLOGY_LAYER_ID))
  {
    ProcessDefinition(geodatabase, topology);
  }
}

private void ProcessDefinition(Geodatabase geodatabase, Topology topology)
{
  // Similar to the rest of the Definition objects in the Core.Data API, there are two ways to open a dataset's 
  // definition -- via the Topology dataset itself or via the Geodatabase.

  using (TopologyDefinition definitionViaTopology = topology.GetDefinition())
  {
    OutputDefinition(geodatabase, definitionViaTopology);
  }

  using (TopologyDefinition definitionViaGeodatabase = geodatabase.GetDefinition<TopologyDefinition>("Backcountry_Topology"))
  {
    OutputDefinition(geodatabase, definitionViaGeodatabase);
  }
}

private void OutputDefinition(Geodatabase geodatabase, TopologyDefinition topologyDefinition)
{
  Console.WriteLine($"Topology cluster tolerance => {topologyDefinition.GetClusterTolerance()}");
  Console.WriteLine($"Topology Z cluster tolerance => {topologyDefinition.GetZClusterTolerance()}");

  IReadOnlyList<string> featureClassNames = topologyDefinition.GetFeatureClassNames();
  Console.WriteLine($"There are {featureClassNames.Count} feature classes that are participating in the topology:");

  foreach (string name in featureClassNames)
  {
    // Open each feature class that participates in the topology.

    using (FeatureClass featureClass = geodatabase.OpenDataset<FeatureClass>(name))
    using (FeatureClassDefinition featureClassDefinition = featureClass.GetDefinition())
    {
      Console.WriteLine($"\t{featureClass.GetName()} ({featureClassDefinition.GetShapeType()})");
    }
  }
}
Requirements

Target Platforms: Windows 10, Windows 8.1

See Also

Reference

TopologyDefinition Class
TopologyDefinition Members