如何在自定义操作中回滚卸载？

Question

I am displaying a MessageBox in OnBeforeUninstall override in custom installer class.

I have assigned the installer class to Uninstall in Custom Action Editor of Visual studio setup project.

Now based on dialog result, I need to rollback the uninstallation?

I have read this but these are specific to Installshield. I need to do it in Visual Studio setup project.

I have tried Process.GetCurrentProcess().Kill() but it puts the installation in unstable state.

I have also tried this.Rollback() but it shows following error

Error 1001. An exception occured while uninstalling. This exception will be ignored and the uninstall will continue. However, the application might not be fully uninstalled after the uninstall is complete. -> The savedState parameter cannot be null."

Answer 1

If the Messagebox in the Installer project is in shown during the Install override. Then if you

throw new InstallException();

The Rollback override will execute.

{MyInstallerProject} > RightClick > Add Project Output > Choose Project from Drop Down > Choose Primary Output > OK. View | CustomActions > Right Click Install > Add Custom Action > Double Click Application Folder > Choose 'primary output from {CustomActionprojectname} (Active)'

Repeat but for "Rollback" instead of "Install" in above instructions.