public override Envelope Extent {get;}

{
  // clip a polyline by a polygon

  List<Coordinate2D> list =
  [
    new Coordinate2D(1.0, 1.0),
    new Coordinate2D(1.0, 4.0),
    new Coordinate2D(4.0, 4.0),
    new Coordinate2D(4.0, 1.0),
  ];

  polygon = PolygonBuilderEx.CreatePolygon(list, SpatialReferences.WGS84);

  LineSegment crossingLine = LineBuilderEx.CreateLineSegment(MapPointBuilderEx.CreateMapPoint(0, 3), MapPointBuilderEx.CreateMapPoint(5.0, 3.0));
  Polyline p = PolylineBuilderEx.CreatePolyline(crossingLine);
  Geometry geometry = GeometryEngine.Instance.Clip(p, polygon.Extent);
}