Question

I have derived a custom bootstrapper from Caliburn.Micro.Bootstrapper, I notice it can take a generic type parameter – what is this for?

public class SimpleInjectorBootstrapper : Caliburn.Micro.Bootstrapper
{
    private Container container;

    public SimpleInjectorBootstrapper()
    {
    }

    protected override void Configure()
    {
        this.container = new Container();
        this.container.Register<IWindowManager, WindowManager>();
        this.container.Register<IEventAggregator, EventAggregator>();
        this.container.Register<IAppViewModel, AppViewModel>();
    }

    protected override object GetInstance(Type serviceType, string key)
    {
        return this.container.GetInstance(serviceType);
    }

    protected override IEnumerable<object> GetAllInstances(Type serviceType)
    {
        return this.container.GetAllInstances(serviceType);
    }

    protected override void OnStartup(object sender, System.Windows.StartupEventArgs e)
    {
        base.OnStartup(sender, e);
        var appViewModel = this.container.GetInstance<IAppViewModel>();
        var windowManager = this.container.GetInstance<IWindowManager>();
        windowManager.ShowWindow(appViewModel);
    }
}

Answer 1

It’s a view model type to use as your starting view model. Caliburn.Micro will resolve the type from the IoC container, and in WPF use the WindowManager to display the root view. Bascially what you’re doing in your OnStartup override.