Selecting closed polylines with 'Linetype generation' enabled.

[R.Gerritsen4967]

I have a piece of code that needs closed polylines.

I use the following selectionfilter to filter the selection so I can only select closed polylines:

Dim sf As New SelectionFilter(New TypedValue() {New TypedValue(0, "LWPOLYLINE"), New TypedValue(70, 1)})

Today I noticed that in some drawings this filter won't select all the closed polylines for me.

After some experimenting I found the 'linetype generation' property of the polylines to be the problem. If this is enabled the above filter will not let me select a closed polyline. If I disable it, there is no problem.

How can I make my code for selecting closed polylines more robust? Is there a 'TypedValue' for closed polylines with the linetype generation enabled?

[Jeff_M · Accepted solution]

The DXF code 70 for polylines is a bit code, 1 = closed, 128 = ltgen enabled. So use the relational test "&":

Dim sf As New SelectionFilter(New TypedValue() {New TypedValue(0, "LWPOLYLINE"), New TypedValue(-4, "&"), New TypedValue(70, 1)})

[R.Gerritsen4967]

Thanks Jeff_M!

This works well!!
It looks so simple. I was digging further into this just now, and I already found the bitcode 128, but I could not get it to work.
I was messing around with Conditional selections (AND, OR, etc.).
Your solution looks really elegant, but it leaves me with another question:
What does the (-4, "&") mean?
the 128 is not mentioned in your code. So how does this work?

Nevermind... I found the info I needed right here.

Your solution just looks for any polyline that is closed but it can have other properties as well, as long as it is closed....