WIxsharp debug custom action in console

Not quite sure what was causing the problem, I deleted my bin folder and then ran a build and it now seems to be working. System.Diagnostics.Debugger.Launch() does work correctly it needs to be contained within an #if DEBUG as @Stein Åsmul stated. Once built in DEBUG run the outputed .msi, you will be prompted to open an instance of visual studio when you hit your custom action during install.

   [CustomAction]
    public static ActionResult CustomAction(Session session)
    {

    #if DEBUG
            System.Diagnostics.Debugger.Launch();
    #endif
            MessageBox.Show("Hello World!" + session[IISSessions.AppPoolName], "External Managed CA");

            return ActionResult.Success;
     }

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