[Microstation CE Update 17] [C#] | Update buffer | Undo previous change

RE: [Microstation CE Update 17] [C#] | Update buffer | Undo previous change

Jan Šlegr — Tue, 12 Sep 2023 15:00:01 GMT

[quote userid="1304677" url="~/products/programming/microstation_programming/f/microstation-programming---forum/249986/microstation-ce-update-17-c-update-buffer-undo-previous-change/781491"]But can we manipulate transactions? This seems to be a more useful approach...[/quote]

There is transaction manager available, but:

It is low level, so good knowledge is required.
I am not sure whether C# TransactionManager offers the same functionality as a group of ITxn* classes in C++.

I recommend to study C++ documentation, important details are described there.

Why? I do not think so.

DgnTool encapsulates complex logic into simpler API so as Jon wrote, when element is modified, DgnElementSetTool ensures everything is done in the right way (not only transaction itself, but also proper name to be displayed in GUI etc).

It does not provide too much information about context, but depending whether you change EC data only or also the element itself, to use scheduling system is necessary.

With regards,

Jan

RE: [Microstation CE Update 17] [C#] | Update buffer | Undo previous change

Ivan Petrov — Tue, 12 Sep 2023 14:03:00 GMT

Thank you very much for your answer.

But can we manipulate transactions? This seems to be a more useful approach...

RE: [Microstation CE Update 17] [C#] | Update buffer | Undo previous change

Jon Summers — Tue, 12 Sep 2023 08:08:43 GMT

[quote userid="1304677" url="~/products/programming/microstation_programming/f/microstation-programming---forum/249986/microstation-ce-update-17-c-update-buffer-undo-previous-change"]How can I enable users to reverse actions performed in my custom form using the "undo-redo" function (the arrows that allow you to revert changes)?[/quote]

MicroStation automatically creates a transaction for primitive commands. The undo/redo logic causes a transaction to be rolled back/forward.

If your code that modifes an Item instance is embedded in a primitive command then the transaction logic is applied automatically. Create your own command class, inheriting from DgnElementSetTool.