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Editorial Team
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Asked: 2026-05-17T17:29:05+00:00

In AutoCAD, through the Layer Properties Manager UI, a user can refresh the usage

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In AutoCAD, through the Layer Properties Manager UI, a user can refresh the usage information for layers in a drawing. The information sometimes get stale when you have layers from xrefs. In your code, when you access the LayerTable for a drawing, its records will not include those layers that it deems as unused (in the Layer Properties Manager UI grey status = unused, blue status = used). In order for me to get to those layers, my program first needs to refresh the usage information. Is there a way to do this through the .NET API, COM API, or the command line?

I’m also pursing an answer in parallel in the AutoCAD forums

http://forums.autodesk.com/t5/NET/Programmatically-refresh-layer-usage-information-NET/m-p/2794756

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1 Answer

  1. Editorial Team

    It seems that the problem was that one of the entities in the particular drawing was corrupt. When one of the users recreated the drawing (including re-adding some xrefs) and ran the program it worked just fine. I also double checked the code and it was definitely hitting the correct layers this time. I am however open to suggestions or solutions on how to detect corruption problems in AutoCAD drawings.

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