public sealed class FindDiagramFeatureQuery 

{
  // Given a list of utility network feature GlobalIDs, find the corresponding diagram features in a network diagram
  static void FindDiagramFeatures(NetworkDiagram diagram, List<Guid> globalIDs)
  {
    FindDiagramFeatureQuery featureQuery = new FindDiagramFeatureQuery();
    featureQuery.NetworkRowGlobalIDs = globalIDs;
    featureQuery.AddAggregations = true;
    featureQuery.AddConnectivityAssociations = true;
    featureQuery.AddStructuralAttachments = true;

    IReadOnlyList<FindResultItem> features = diagram.FindDiagramFeatures(featureQuery);
    foreach (FindResultItem findFeature in features)
    {
      long objectID = findFeature.ObjectID;
      Guid guid = findFeature.GlobalID;
      GeometryType geometryType = findFeature.GeometryType;
      int sourceID = findFeature.SourceID;
    }
  }
}