AutoCAD Interop fast selection of xref nested objects on layer name

[kbarnettza]

I am doing this the slow way ... it is painfully slow...

By iterating every object in the block. Test for layer name and add to list of acad entities.

AcadBlock block1 = acadApp.ActiveDocument.Blocks.Item(...);

foreach (AcadEntity ae1 in block1)

{ ... }

It is horribly slow.

I was going to try a selection set in DBX document ... could not find it ...

Selection sets with filters are nice and fast... if only I could do it with a nested layer... what have I missed?

Thanks for reading...

Kevin.

[moogalm]

Hope this blog will help you regarding selection sets.

http://adndevblog.typepad.com/autocad/2012/07/creating-a-selection-set-using-com-interop.html

[kbarnettza]

Thx ... that blog page matches the code I use for filtering of non-nested. I am hoping to find a similar filter that works within externally referenced entities.

[moogalm]

One way to work around is to programatically change the xrefdatabase as current working database and apply Selection filter and return current database.

If you tried above approach already , I'm sorry I don't have an API which selects all xref entities with in current database.