How do I use xamarin shell programmatically?

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Xamarin

I have a Xamarin application that I need to convert from the older stack-based navigation to the new Shell navigation system. All the examples I can find show this being built in XAML, which I cannot do because I do not have a parameterless constructor for my ContentPage classes.

I would like to build my navigation in C# but am struggling to figure this out. I've tried a hundred ways but never seem to get what I expect on the screen.

In particular, I am struggling to create and navigate to the initial 'parent' or 'root' application screen.

Any help or pointers to example code would be most welcome.

Kind wishes - Patrick

What I have tried:

My most recent (extremely scruffy) code is:

public class ShellApp : Shell
{
    public ShellApp()
    {
        Tab home = new Tab()
        {
            Route = "home",

        };
        home.Items.Add
        (
            new ShellContent() { Content = new HomeView( new HomeViewLogic() ) }
        );

        TabBar tb = new TabBar();
        tb.Items.Add( home );

        Items.Add( tb );
    }
}