geometry - How to find self-intersecting polylines using ArcObjects?

If I have a polyline, how do I figure out whether it is self-intersecting? I tried to use ITopologicalOperator.IsSimple Property, but it always returns true.

Are there any ways of doing these kind of topological checks over individual geometries?

Answer

I think you can do with with the ITopologicalOperator2 interface:

dim pTopoLogicalOp as ITopologicalOperator2
Set pPolyline = pFeature.ShapeCopy

Set pTopoLogicalOp = pPolyline
Let pTopoLogicalOp.IsKnownSimple = False
If pTopoLogicalOp.IsSimple = False Then
   ' Polyline is self intersecting
End If