public Polygon GetPolygonByName(string name) => Polygons.FirstOrDefault(p => p.Name == name);
public Polygon GetPolygon(string cn) => Polygons.FirstOrDefault(p => p.CN == cn);
public Polygon GetPolygonByName(string name) => Polygons.FirstOrDefault(p => p.Name == name);
public Polygon GetPolygon(string cn) => Polygons.FirstOrDefault(p => p.CN == cn);