BuildingCoder.CmdFilledRegionCoords.GetBoundaryCorners C# (CSharp) Метод

        List<XYZ> GetBoundaryCorners( FilledRegion region )
        {
            List<XYZ> result = new List<XYZ>();

              ElementId id = new ElementId(
            region.Id.IntegerValue - 1 );

              Sketch sketch = region.Document.GetElement(
            id ) as Sketch;

              if( null != sketch )
              {
            CurveArray curves = sketch.Profile.get_Item( 0 );

            if( null != curves )
            {
              foreach( Curve cur in curves )
              {
            XYZ corner = cur.GetEndPoint( 0 );
            result.Add( corner );
              }
            }
              }
              return result;
        }