How to Save UserData into DWG File?

[353800230]

I  want to save some custom data to a dwg File by Document.UserData.

I Save my custom Data of Bundle. When the document is opening, It is Used. I can get userdata form document.

Howerver, When I closed thd document, the userdata is not be save in the Dwg file. When open the file , the count of userdata is 0.

 Anyone cane helper me ,how to save custom data in dwg file by Document.UserData？

Thanks

[daniel_cadext]

maybe a Xrecord?

https://help.autodesk.com/view/OARX/2023/ENU/?guid=GUID-0B9BDDE0-CDB7-4235-A2B7-8BD1FA82503F

[youssefGC]

Hi,

You can use NOD (Named Object Dictionary) to save data in a DWG file. NOD can include various elements such as blocks, layers, styles, and more information.

[Keith.Brown]

User data does not persist between sessions.  Norman did some tests and verified this.

https://forums.autodesk.com/t5/net/does-document-userdata-persist-over-acad-sessions/td-p/2569077

My preferred method is to serialize a class to json with my information in it.  Zip that class up and then save it in an xrecord.  Once the boiler plate code is complete, you can create new classes of information quite quickly and save it in a document or on an entity.

[ntclmain · Accepted solution]

@353800230 

 To save custom data in a drawing, you should use Xrecord as Daniel_cadext suggested.

Here is the old topics about XRecord with Example that may help you:

 https://forums.autodesk.com/t5/net/store-data-in-dwg-file/td-p/3074780
https://forums.autodesk.com/t5/net/xrecord/m-p/7784421/highlight/true#M57654
https://forums.autodesk.com/t5/net/save-a-string-value-in-dwg-file/td-p/8595020