topic Re: Modfiy, SaveAs and Rollback in Revit API Forum

Modfiy, SaveAs and Rollback

BenoitE&A — Tue, 08 Jan 2019 12:38:11 GMT

Hey,

We are creating an add-that would do the following for a given set of areas:

1) modifies the document according to the given area

2) Save the modified document to a new document

3) Rollback the changes

Then switch to the next area of the set.

I have tried the following ways, all based on the idea of a TransactionGroup that I rollback at the end of step 3. But none of them work:

Idea 1 : use SaveAs.

Pb : SaveAs is not authorized in an open Transaction or TransactionGroup

Idea 2 : use a PostCommand with SaveAsLibraryGroup

Pb : the postCommand is executed once the flow is terminated so that I can not Rollback my TransactionGroup.

Any idea / suggestions ?

This item is similar to this one :

https://forums.autodesk.com/t5/revit-api-forum/modeless-rollback-a-transaction-after-commit/m-p/8127938#M32269

Benoit

Re: Modfiy, SaveAs and Rollback

stever66 — Tue, 08 Jan 2019 14:52:22 GMT

I'm not sure exactly what you are trying to accomplish, but once you have done a "Save-as", I don't think you can go back and undo a transaction on the previous file.

Maybe try a different workflow? Like copy the original file (or open and do a Save-As), open the copy, make your changes and save, and then just reopen the original unchanged document and repeat?

I'm also not sure offhand what you can do without a post command, so I may be way off here.

Re: Modfiy, SaveAs and Rollback

jeremytammik — Tue, 08 Jan 2019 21:13:58 GMT

Dear Benoit,

Thank you for your query.

Save the original document A.
Make modifications and save as B.
Open A.
Close B.
Make modifications and save as C.
Open A.
Close C.
Et cetera ad infinitum.

I hope this helps.

Best regards,

Jeremy

Re: Modfiy, SaveAs and Rollback

BenoitE&A — Tue, 08 Jan 2019 21:45:07 GMT

Hi Jeremy, hi Stever,

You are both right, the best way is to change the workflow : save before, than modify.

Once answered, some questions look dumb...

The Rollback idea was cool though...

Thanks

Benoit

Re: Modfiy, SaveAs and Rollback

stever66 — Wed, 09 Jan 2019 14:24:25 GMT

Its definitely not a dumb question... I'm sure rolling back the transaction would have been a lot faster than all the open and close business if there was a way to make that work.

I did have another thought, but since I have a pretty limited knowledge of C#, I'm not sure there is a way to make this work either.

Is there any way to make a copy of the document in C#? I'm pretty sure something as simple as this won't work:

Document doc1 = uiDoc.Document;

Document doc2 = uiDoc.Document;

That obviously won't work because both doc1 & doc2 are just references to the same document.

But if you could do something that is the equivalent of:

Document doc2 = doc1 by value;

You might be able to start the transaction on doc2 and save it. Then go back to doc1 and repeat.

I'm just not sure C# can really provide a real copy of a document variable without just creating 2 references to the same object. And you might also be running into the postcommand problem again.

Re: Modfiy, SaveAs and Rollback

BenoitE&A — Wed, 09 Jan 2019 14:35:53 GMT

Hi Stever,

Thank you for the idea. Yes you can create a Document which is only a pointer to the same document (Document newDoc = uidoc.Document;). But I am not sure whether you can modify this document without saving it (writing in memory), and saving is not allowed as long as your Transactions are not closed.

I am back to my original question though. The integral copy of the document then modify it is a real pain for what I want to do (slow, long, and not reliable). So I would really like to do my previous hint :

1) modify the document

2) extract the modified geometry (the only way I found was with the PostCommand SaveAsLibraryGroup)

3) cancel the modifications

Would anybody have an idea how to do this ?

Benoit