Question

I have a .NET deployment project. I would like to add a custom uninstall action that checks certain conditions and optionally cancels the uninstallation. Is that possible?

As far as I figured out, it’s only possible to define custom actions that cannot influence the main installer itself.

Answer 1

The answer is actually quite easy but also quite ugly.

At the point in the custom action where I want to cancel the uninstallation I just throw an ApplicationException:

//Nono. Don't uninstall. To abort uninstall, throw an exception
throw new ApplicationException(Constants.CONST_APP_NAME + @" can't be uninstalled because the preparation hasn't been completed.");