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Posts: 95
Registered: ‎04-04-2012
Message 1 of 3 (257 Views)
Accepted Solution

How to get the ObjectIdCollection of all entities in a certain layer?

257 Views, 2 Replies
05-22-2012 07:34 PM

How could I get the ObjectIdCollection of all entities (points, polyline) in a certain layer?

I am using the following code at this moment.


private ObjectIdCollection GetEntitiesOnLayer(string layerName)


            Editor ed = doc.Editor;

            TypedValue[] tvs = new TypedValue[1] { new TypedValue((int)DxfCode.LayerName, layerName) };

            SelectionFilter sf = new SelectionFilter(tvs);

            PromptSelectionResult psr = ed.SelectAll(sf);


            if (psr.Status == PromptStatus.OK)

                return new ObjectIdCollection(psr.Value.GetObjectIds());


                return new ObjectIdCollection();



But it seems the function fetches more ObjectId than I expected.

For example, if I draw 3 points and 2 polylines in "A" layer.


ObjectIdCollection obc = GetEntitiesOnLayer("A");

int i = obc.Count;


I was expecting i to be 5 (3 points and 2 polylines), but i seems to be more than 5.


Any thought?

*Expert Elite*
Posts: 1,569
Registered: ‎10-08-2008
Message 2 of 3 (251 Views)

Re: How to get the ObjectIdCollection of all entities in a certain layer?

05-22-2012 09:54 PM in reply to: dynamicscope

Your code is working good on my end

Maybe you need to add filter on entities in

the current layout, just a guess, e.g:


TypedValue [] tvs = newTypedValue[2] { newTypedValue((int)DxfCode.LayerName, layerName),

newTypedValue((int)DxfCode.LayoutName, "Model") };

*Expert Elite*
Posts: 752
Registered: ‎02-13-2008
Message 3 of 3 (230 Views)

Re: How to get the ObjectIdCollection of all entities in a certain layer?

05-23-2012 08:59 AM in reply to: dynamicscope

That would be my guess as well.  SelectAll will return entities that are not in the current space, but otherwise your code should be fine, and I've never had a simple selection filter give me entities that did not meet the criteria.

Dave O.                                                                  Sig-Logos32.png
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