MVVM Light抛出（你忘了调用＆gt; NavigationService.Configure？参数名：pageKey）异常

Question

我正在使用mvvm light创建一个Universal winrt应用程序。在ViewModelLocator中，我在mvvm light的内置NavigationService中注册了我的视图

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");

抛出此异常

  

没有这样的页面：PreRegisterPage。你忘记打电话了吗？   NavigationService.Configure？参数名称：pageKey

我错过了什么吗？

Answer 1

您可能忘记在INavigationService ctor中传递ViewModel个对象，此处ViewModel应如何显示：

  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;           
    }
}