topic Storing user data in a project file in Revit API Forum

Storing user data in a project file

r.polyakov.unkeng — Thu, 09 Feb 2023 11:02:33 GMT

Hi there!

For example, is it possible to save a list of elements in a project so that they can be selected later, even after restarting Revit?
I was thinking about using a hidden shared parameter, but are there any other options?

Re: Storing user data in a project file

caroline.gitonga — Thu, 09 Feb 2023 11:14:30 GMT

Hi @r.polyakov.unkeng,

Revit API provides an exciting and powerful extensible storage feature. The feature offers a completely new storage facility for applications which is completely invisible to the user. This functionality can be used to replace the technique of storing data in hidden shared parameters. Kindly, refer to these links to learn and understand the whole concept of Extensible storage and how you can achieve more using it:

https://knowledge.autodesk.com/support/revit/learn-explore/caas/CloudHelp/cloudhelp/2014/ENU/Revit/files/GUID-113B09CA-DBBB-41A7-8021-005663B267AE-htm.html#:~:text=The%20Revit%20API%20allows%20you,%2C%20object%2Doriented%20data%20structures,

https://thebuildingcoder.typepad.com/blog/2011/04/extensible-storage.html,

Re: Storing user data in a project file

r.polyakov.unkeng — Thu, 09 Feb 2023 11:20:11 GMT

Thanks @caroline.gitonga , it's excellent!

Re: Storing user data in a project file

r.polyakov.unkeng — Thu, 09 Feb 2023 15:30:51 GMT

Do I understand correctly that the valueType for AddMapField() cannot be a collection or an array?

Re: Storing user data in a project file

caroline.gitonga — Fri, 10 Feb 2023 12:55:13 GMT

SchemaBuilder.AddArrayField() method can be used to create a field containing an array of values in the Schema,

SchemaBuilder.AddMapField() method can be to create a field containing an ordered key-value map in the Schema