Hi guys!

Trying to update functionality in v. 8.11, and having problems with displaying cancellation message...

    private static void OnTrashing(IContentService sender, MoveEventArgs<IContent> e)
    {
        var content = e.MoveInfoCollection.FirstOrDefault()?.Entity;
        if (content is null) return;

        if (!e.CanCancel || !content.Published) return;

        e.Messages.Add(new EventMessage(
            "Kan ikke slette",
            "Kontroller der er publiceret, kan ikke slettes.",
            EventMessageType.Warning));

        e.Cancel = true;
    }

(The cancellation works fine.)

Having read other posts, but no luck finding anything with a solution. Also tried .CancelOperation()