New Post: How to run Bootstrapper in BackgroundWorker.DoWork event

Hi,

I am using Prism 4.1 with MEF. What i want is to run Bootstrapper on background silently while my login window shows up. So that user can continue to input username and password while the Bootstrapper is loading a lot of modules.

In order to get this, I am using BackgroundWorker.However i get error saying "The calling thread must be STA, because many UI components require this.". I tried to use a thread with STA mode to run the BackgroundWorker, however it caused other issues that i could't figure out. in order to avoid this issue, i return null as a result of CreateShell()
when the Bootstrapper is running. and after Bootstrapper is loaded completely, i set the Shell property via SetShell() as shown in below. However, I got error saying "The region manager does not contain the ShellApplicationMdiContainerRegion region." . The "ShellApplicationMdiContainerRegion" is the region name I defined in ShellView xaml. Seems to me that this region is not registered in the prism.

Could someone shred some light on this?

By the way, I don’t want to use a thread with STA mode as well as Application.Current.Dispatcher.Invoke method to run Bootstrapper as any of them will cause other big issues.

    protected override DependencyObject CreateShell()
    {
        return null;
    }

    private void Backgroundworkder_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
    {
        bootstrapper.SetShell();
    }
    public void SetShell()
    {
        this.Shell = this.Container.GetExportedValue<ShellView>();
    }