Sub-transactions among multiple documents

jnoordzij — Fri, 01 Feb 2019 13:44:54 GMT

My question is about sub transactions.

I have designed an add-in that does something like the following:

-start transaction in doc

-make some changes

-scan the doc for placed family instances

-for each found family instance:

-go inside that family

-start transaction inside family

-make some changes

-scan the inside of the family for nested family instances

-for each found nested family

-go inside that nested family

-start transaction inside nested family

-make some changes

-commit transaction inside nested family

-load nested family back into family

-commit transaction inside family

-load family back into document

-commit transaction in doc

The way I have it now, is that all those transactions are separate transactions. So after the command is run, a whole bunch of commands appear under the undo-command button. However I would like to be able to undo this command with 1 press of the undo button.

I was thinking to use sub-transactions for this. But I was wondering if sub-transactions always have to be inside the same doc, or can it be among multiple docs, like in my example?

Furthermore I am struggling to find a good piece of example-code on sub-transactions. I found this, but I am not sure if I can use it, considering that the example executes on the same doc.

So my question is: How would the syntax about the main-transaction and sub-transactions be, based on the above example?

Thanks in advance.

Re: Sub-transactions among multiple documents

jeremytammik — Fri, 01 Feb 2019 13:54:53 GMT

Good question!

The TransactionGroup constructor takes the document as an argument:

https://apidocs.co/apps/revit/2019/74cff3fa-9380-2c30-9fa9-b0e839a2c8e4.htm

All sub-transactions it contains can process only that specific document.

You could start a new transaction group for each document you process.

However, I do not see how you could implement what you are doing using less transaction groups than the number of documents processed.

Cheers,

Jeremy

Re: Sub-transactions among multiple documents

jnoordzij — Fri, 01 Feb 2019 14:27:45 GMT

Thanks, Jeremy.

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Sub-transactions among multiple documents

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Re: Sub-transactions among multiple documents