public sealed class FindNetworkRowQuery 

public void FindDiagramRows(NetworkDiagram diagram, List<Guid> globalIDs)
{
  FindNetworkRowQuery rowQuery = new FindNetworkRowQuery();
  rowQuery.DiagramFeatureGlobalIDs = globalIDs;
  rowQuery.AddAggregations = true;

  IReadOnlyList<FindResultItem> rows = diagram.FindNetworkRows(rowQuery);
  foreach (var findRow in rows)
  {
    long objectID = findRow.ObjectID;
    Guid guid = findRow.GlobalID;
    GeometryType geometryType = findRow.GeometryType;
    int sourceID = findRow.SourceID;
  }
}