topic Re: [transaction] difference in Revit API Forum

[transaction] difference

Joris.vd.Meulen — Tue, 09 Jul 2019 05:59:42 GMT

What is the difference between:

//used here for example (https://www.revitapidocs.com/2017/31b73d46-7d67-5dbb-4dad-80aa597c9afc.htm)
[Autodesk.Revit.Attributes.Transaction(Autodesk.Revit.Attributes.TransactionMode.ReadOnly)]

//used in my coding
[Transaction(TransactionMode.Manual)]

Re: [transaction] difference

jeremytammik — Tue, 09 Jul 2019 06:40:53 GMT

Try it out!

Always try out everything!

Never trust anybody except your own code!

Still, if you insist:

If you set your transaction mode to read-only, Revit will throw an exception if you try to open a transaction.

That guarantees that your add-in will under no circumstances be able to modify any documents.

Cheers,

Jeremy

Re: [transaction] difference

Joris.vd.Meulen — Tue, 09 Jul 2019 06:51:27 GMT

Hi @jeremytammik ,

Fiddling with C# that is what I'm doing all the time.

So if an addin has no intention of altering the model itself, the TransactionMode should always be ReadOnly.

Because

1. safer

2. clear coding / understandable

3. faster (???) (For example: I can imagine that selection addin in ReadOnly could be faster than Manual selecting 100k elements?)

Re: [transaction] difference

jeremytammik — Thu, 11 Jul 2019 12:40:38 GMT

Dear Joris,

Thank you for your update.

> So, if an add-in has no intention of altering the model itself, the TransactionMode should always be ReadOnly.

Yes, absolutely!

> safer

Yes.

> clear coding / understandable

Yes.

> faster (???) (For example: I can imagine that selection addin in ReadOnly could be faster than Manual selecting 100k elements?)

Unknown. Please try it out and let us know.

Thank you!

Best regards,

Jeremy