Question

我目前正在使用MahApps Metro学习Catel + Orchestra。我正在使用MetroUI从Catel.Examples项目中执行身份验证示例。我的问题是我在MahAppsService中创建一个新的MainWindow

        public FrameworkElement GetMainView()
    {
        return new MainWindow();
    }

永远不会调用MainWindowViewModel的构造函数

public MainWindowViewModel(UIVisualizerService uiVisualizarService, IAuthenticationProvider authenticationProvider)
    {
        _uiVisualizerService = uiVisualizarService;
        _authenticationProvider = authenticationProvider;
        RoleCollection = new ObservableCollection<string>(new[] { "Read-Only", "Administrator" });
        ShowView = new Command(OnShowViewExecute, OnShowViewCanExecute, "ShowView");
    }

我已将其缩小到构造函数的2个依赖项。如果我删除了UIVisualizerService和IAuthenticacionProvider依赖项，则正确调用构造函数，但ModelView稍后需要这两个服务。

我迷失了我能做些什么才能让它发挥作用。

Answer 1

您必须在ServiceLocator中注册IAuthenticationProvider：

var serviceLocator = ServiceLocator.Default;

serviceLocator.RegisterType<IAuthenticationProvider, MyAuthenticationProvider>();

请注意，Catel中的所有服务都会自动为您注册，但您必须自己注册自己的服务（例如，使用ModuleInit或程序集中的其他入口点）。

Answer 2

I solved the problem by adding a explicit injection of the viewmodel into the mainwindow constructor.

public MainWindow(MainWindowViewModel _mainwindowviewmodel):base(_mainwindowviewmodel)
 {
 InitializeComponent();
 }

Declaring the field for the AuthenticationProvider interface to the MahAppsService class.

private readonly IAuthenticationProvider _authenticationProvider;

Also adding the dependency of the AuthenticationProvider interface to the constructor.

 public MahAppsService(ICommandManager commandManager, IMessageService messageService, IUIVisualizerService uiVisualizerService, IAuthenticationProvider authenticationProvicer)
    {
        Argument.IsNotNull(() => commandManager);
        Argument.IsNotNull(() => messageService);
        Argument.IsNotNull(() => uiVisualizerService);
        Argument.IsNotNull(() => authenticationProvicer);
        _commandManager = commandManager;
        _messageService = messageService;
        _uiVisualizerService = uiVisualizerService;
        _authenticationProvider = authenticationProvicer;
    }

And the last step is creating an instance of the viewmodel in the GetMainView in the MahAppsService class.

 public FrameworkElement GetMainView()
 {
 var mainwindowViewModel = TypeFactory.Default.CreateInstanceWithParametersAndAutoCompletion<MainWindowView‌Model>(_uiVisualizerService, _authenticationProvider);
 return new MainWindow(mainwindowViewModel);
 }

Please note that this might not be the best way to do it but it gets the work done. If someone has better way feel free to share it.

Catel身份验证+ MahApps

2 个答案: