STExteriorRing (geometry)#
Returns the exterior ring of a geometry instance that is a polygon.
Syntax#
.STExteriorRing ()
Return type#
geometry
Remarks#
This method returns null if the geometry instance is not a polygon.
Example#
Create a Polygon instance and use STExteriorRing() to return the exterior ring of the polygon as a LineString.
DECLARE @g geometry;
SET @g = geometry::STGeomFromText('POLYGON((0 0, 3 0, 3 3, 0 3, 0 0),(2 2, 2 1, 1 1, 1 2, 2 2))', 0);
SELECT @g.STExteriorRing().ToString();