c# - MVVM轻掷(您是否忘记了调用> NavigationService.Configure？参数名称: pageKey) exception

Question

我正在使用mvvm light制作通用winrt应用程序。在ViewModelLocator中，我已经在mvvm light的内置NavigationService中注册了 View

SimpleIoc.Default.Register<INavigationService>(() =>
{
    var navigationService = new NavigationService();
    navigationService.Configure("PreRegisterPage", typeof(PreRegisterPage));
    return navigationService;
});

但是，当我尝试使用此代码导航到该页面时，

 _navigationService.NavigateTo("PreRegisterPage");

它抛出此异常

No such page: PreRegisterPage. Did you forget to call NavigationService.Configure? Parameter name: pageKey

我想念什么吗？

Answer 1

您可能忘记了在INavigationService ctor中传递ViewModel对象，这里的ViewModel应该如下所示:

  public class MainViewModel : ViewModelBase
{
    private INavigationService _navigationService;
    private RelayCommand _navigateCommand;
    public RelayCommand NavigateCommand
    {
        get
        {
            return _navigateCommand
                ?? (_navigateCommand = new RelayCommand(
                () =>
                {
                    _navigationService.NavigateTo("PreRegisterPage");
                }));
        }
    }
    public MainViewModel(INavigationService navigationService)
    {
        _navigationService = navigationService;           
    }
}