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Returns 1 if the start and end points of the given geometry instance are the same. Returns 1 for geometrycollection types if each contained geometry instance is closed. Returns 0 if the instance is not closed.

.STIsClosed ( )

SQL Server return type: bit

CLR return type: SqlBoolean

This method returns 0 if any figures of a geometry instance are points, or if the instance is empty.

All Polygon instances are considered closed.

The following example creates a LineString instance and uses STIsClosed() to test if the LineString is closed.

DECLARE @g geometry; SET @g = geometry::STGeomFromText('LINESTRING(0 0, 2 2, 1 0)', 0); SELECT @g.STIsClosed();