Delete closed Polylines in AutoCAD

Question

I'm Trying to delete all Plines that are not closed in a certain layer. But my code is not working.

I get an error Type Mistype at If LWobj.Closed = False And LWobj.Layer = "0_String" Then

The Layer "0_String" Exists in drawing and LWobj closed state is derive correctly.

Sub clean()

Dim LWobj As AcadLWPolyline

For Each LWobj In ThisDrawing.ModelSpace
    If LWobj.Closed = False And LWobj.Layer = "0_String" Then
        LWobj.Delete
        ThisDrawing.Regen acActiveViewport
    End If
Next

End Sub

Answer 1

The issue is that you have defined LWobj as an AcadLWPolyline, but not all objects in the Modelspace container will be of type AcadLWPolyline.

Instead, you should either use a selection set filter to acquire a set of only LWPolyline objects, or define LWobj as an AcadEntity and then check the object type along with your other conditions.

For example:

Dim ent As AcadEntity
For Each ent In ThisDrawing.ModelSpace
    If TypeOf ent Is AcadLWPolyline Then
        If ent.Closed = False And ent.Layer = "0_String" Then
            ent.Delete
        End If
    End If
Next

You also don't want to be performing a regen with every iteration!