棱镜错误 'The region manager does not contain the region'

Question

enter image description here

我正在按照 MVVM 模式使用 WPF 开发一个 Prism 示例应用程序，但是当它通过以下代码时它在我的应用程序中出现了一些问题：

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

我尝试了其他 stackoverplow 帖子中提出的解决方案，但它不起作用。

(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));        
        }
    }

谢谢。

Answer 1

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

并通过 Dispatcher 获取区域（应该加载 ViewInjectionMain.xaml 以加载 ViewInjectionMain_MainRegion）

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);
            }));
        }

    }

希望对您有所帮助

Answer 2

我按照建议进行了测试。我制作了一些按钮并将其绑定到 "DelegateCommand"。有用。但是当我做了一些函数 "IRegion region = _regionMansger.Regions["ViewInjectionMain_MainRegion"];"它在构造函数中调用它不起作用。

RegionManager 在视图的视图模型构造函数结束后包含区域。

棱镜错误 'The region manager does not contain the region'

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

.net

c#

wpf

prism

mvvm