Prism error 'The region manager does not contain the region'

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I am developing a Prism Sample application with WPF following MVVM pattern, but it has some problem in my application when it pass below code :

var view = _container.Resolve<DummyView>();
IRegion region = _regionMansger.Regions["ViewInjectionMain_MainRegion"];


I have tried out the solution proposed in other stackoverplow posts but it doesn't work.

(project github here).

class ViewInjectionMainViewModel : BindableBase

IUnityContainer _container;
IRegionManager _regionMansger;
public ViewInjectionMainViewModel(IUnityContainer container, IRegionManager regionManager)

_container = container;
_regionMansger = regionManager;

var view = _container.Resolve<DummyView>();
IRegion region = _regionMansger.Regions["ViewInjectionMain_MainRegion"];

region.Add(view);



class Bootstrapper : UnityBootstrapper

protected override DependencyObject CreateShell()

return this.Container.Resolve<MainWindow>();


protected override void InitializeShell()

base.InitializeShell();

var regionManager = this.Container.Resolve<IRegionManager>();

if (regionManager != null)

regionManager.RegisterViewWithRegion("MainRegion", typeof(FirstView));



Container.RegisterType<object, RegionBasic>("RegionBasic");
Container.RegisterType<object, RegionControlMain>("RegionControlMain");
Container.RegisterType<object, DummyView>("DummyView");
Container.RegisterType<object, ViewInjectionMain>("ViewInjectionMain");

Application.Current.MainWindow.Show();


protected override void ConfigureModuleCatalog()

var catalog = (ModuleCatalog)ModuleCatalog;
catalog.AddModule(typeof(ModuleA.ModuleAModule));
catalog.AddModule(typeof(ModuleB.ModuleBModule));
catalog.AddModule(typeof(DummyModule.DummyModuleClass));




Thanks.

2 Answers
2

regionManager.RegisterViewWithRegion("MainRegion", typeof(FirstView));
regionManager.RegisterViewWithRegion("ViewInjectionMain_MainRegion", typeof(DummyView)); //add this line


and get region via Dispatcher (the ViewInjectionMain.xaml should be loaded for loading ViewInjectionMain_MainRegion also)

class ViewInjectionMainViewModel :BindableBase

IUnityContainer _container;
IRegionManager _regionMansger;
public ViewInjectionMainViewModel(IUnityContainer container, IRegionManager regionManager)

_container = container;


_regionMansger = regionManager;

System.Windows.Application.Current.Dispatcher.BeginInvoke(System.Windows.Threading.DispatcherPriority.Send, new Action(() =>

var view = _container.Resolve<DummyView>();


IRegion region = _regionMansger.Regions["ViewInjectionMain_MainRegion"];


region.Add(view);
));





Hope this will help you

I tested follow advice. I made some button and bound it to "DelegateCommand". It works. but when i made some function that "IRegion region = _regionMansger.Regions["ViewInjectionMain_MainRegion"];" and it call in constructor it doesn't work.

RegionManager contain region after view's viewmodel constructor ended.

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