PRISM + MEF -- Can't get regions to work properly

Question

a bit new to Prismv4 and MEF.

I went through the QuickStarts and tried to combine two of them together, but I can't seem to get it working.

First, I got a Bootstrapper to load the Shell Window.

public sealed class ClientBootstrapper : MefBootstrapper
{
    protected override void ConfigureAggregateCatalog()
    {
        base.ConfigureAggregateCatalog();

        //Add this assembly to export ModuleTracker (Shell is in this Assembly).
        AggregateCatalog.Catalogs.Add(new AssemblyCatalog(Assembly.GetExecutingAssembly()));
    }

    protected override DependencyObject CreateShell()
    {
        return Container.GetExportedValue<Shell>();
    }

    protected override void InitializeShell()
    {
        base.InitializeShell();

        Application.Current.MainWindow = (Window)Shell;
        Application.Current.MainWindow.Show();
    }
}

This worked fine. The Shell window was shown and a nice Hello World message appeared. Then I tried to create a Region inside the Shell window so I can load a View into that region. I haven't even gotten this to work to even look at moving it to an outside assembly.

[ModuleExport(typeof(HelloWorldModule), InitializationMode = InitializationMode.OnDemand)]
public class HelloWorldModule : IModule
{
    [Import(AllowRecomposition = true)]
    private IRegionViewRegistry regionViewRegistry;

    [ImportingConstructor()]
    public HelloWorldModule(IRegionViewRegistry registry)
    {
        this.regionViewRegistry = registry;
    }

    public void Initialize()
    {
        regionViewRegistry.RegisterViewWithRegion("PrimaryRegion", typeof(Views.HelloWorldView));
    }
}

The HelloWorld view (just a simple UserControl that contains a TextBlock) is not being loaded into the region! I guess I'm a bit lost here on how to load in my regions.

Answer 1

You can try this and it works for me, the Module class as follows:

[ModuleExport(typeof(HelloWorldModule))]
public class HelloWorldModule : IModule
{

    [Import]
    private IRegionManager regionManager;

    public void Initialize()
    {
        Uri viewNav = new Uri("HelloWorldView", UriKind.Relative);
        regionManager.RequestNavigate("PrimaryRegion", viewNav);
    }
}

The View class as follows:

[Export("HelloWorldView")]
[PartCreationPolicy(CreationPolicy.Shared)]
public partial class HelloWorldView : UserControl
{
    public HelloWorldView()
    {
        InitializeComponent();
    }
}

The xaml in HelloWorldView

<UserControl x:Class="HelloWorldModule.HelloWorldView"
         xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
         xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
         xmlns:d="http://schemas.microsoft.com/expression/blend/2008"  mc:Ignorable="d" 
         d:DesignHeight="300" d:DesignWidth="300">
<Grid>
    <TextBlock>Hello World</TextBlock>
</Grid>
</UserControl>

You will need

protected override void ConfigureAggregateCatalog()
    {
        this.AggregateCatalog.Catalogs.Add(new AssemblyCatalog(typeof(Bootstapper).Assembly));
        this.AggregateCatalog.Catalogs.Add(new AssemblyCatalog(typeof(HelloWorldModule.HelloWorldModule).Assembly));

    }