protected override void OnStartup(StartupEventArgs e)
{
// Construct our main window
// We create the view model here so we can tell MEF to use this instance of it, rather than create its own
var mainWindow = new MainWindow();
var mainViewModel = new MainViewModel();
var mainView = new MainView(mainViewModel);
mainWindow.Content = mainView;
// Creat a directory (plugins) and assembly catalog (exports)
var catalog = new DirectoryCatalog(".");
var asmCatalog = new AssemblyCatalog(this.GetType().Assembly);
CompositionContainer container = new CompositionContainer(new AggregateCatalog(catalog, asmCatalog));
// Register our current instance of MainViewModel with the container
// If we don't do this then MEF will create its own
//
// We only need to do this because our view and viewmodel is already constructed.
container.ComposeExportedValue<IMessageService>(mainViewModel);
// Wireup our plugins, which in turn wires up their imports
container.SatisfyImportsOnce(this);
// We can now work with the metadata and only initialise the plugins we want
// The plugin won't even be constructed if we choose not to access "plugin.Value"
if (Plugins != null)
{
foreach (var plugin in Plugins)
{
// Don't load anything named "Plugin2" - we could use this for allowing users
// to specify plugins to load/not load at a later date.
//
// Plugin2's Main class is never constructed
if (plugin.Metadata.Name != "Plugin2")
plugin.Value.Initialise();
}
}
mainWindow.Show();
}
public MainView(MainViewModel viewModel)
{
this.DataContext = viewModel;
InitializeComponent();
}
