mvvm - Prism mvvm 中的 ViewModelLocator

Question

这是我的场景，我需要创建一个简单的 uwp 应用程序，并且我有一个 View 模型和多个 View ..我正在使用 prism mvvm/unity 。

主页.xaml

  <prism:SessionStateAwarePage
x:Class="MvvmSample.Views.MainPage"
xmlns:prism="using:Prism.Windows.Mvvm"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="using:MvvmSample"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
prism:ViewModelLocator.AutoWireViewModel="True"
mc:Ignorable="d">
<Grid Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
    <TextBlock Text="{Binding Title}" FontSize="29.333" />
    <Button Content="Navigate" Command="{Binding del}"/>
</Grid>

Viewmodels.MainpageViewModel

    public class MainPageViewModel : ViewModelBase
    {
        public string Title { get; set; }
        public INavigationService NavigateToPage;
        public static List<string> names = new List<string>() { "Anzal", "Rashid", "Kamil", "Fahad" };
        public ObservableCollection<string> Mynames { get; set; }
        public MainPageViewModel(INavigationService navigationservice)
        {
            this.Title = "Run Time";
            NavigateToPage = navigationservice;
            for (int i = 0; i < names.Count; i++)
            {
                Mynames.Add(names[i]);

            }
            del = new DelegateCommand(
               () =>                                    
            NavigateToPage.Navigate(App.Expeirences.Second.ToString(),null);
               );
        }
    }

第二页.xaml

  <prism:SessionStateAwarePage
x:Class="Design3.Views.SecondPage"
xmlns:prism="using:Prism.Windows.Mvvm"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="using:Design3"
prism:ViewModelLocator.AutoWireViewModel="True"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d">
<Grid Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
    <ListBox ItemsSource="{Binding names}"/>
</Grid>

应用程序.xaml.cs

      sealed partial class App : PrismUnityApplication
{
    public App()
    {  
      this.InitializeComponent();
    }
    protected override Task OnInitializeAsync(IActivatedEventArgs args)
    {
        Container.RegisterInstance<INavigationService>(this.NavigationService);
        return base.OnInitializeAsync(args);
    }
    protected override Task OnLaunchApplicationAsync(LaunchActivatedEventArgs args)
    {
        this.NavigationService.Navigate(Expeirences.Main.ToString(), null);
        Window.Current.Activate();
        return Task.FromResult(true);
    }
    public enum Expeirences
    {
        Main,
        Second
    }

}

现在问题出现了..如何将我的第二页绑定(bind)到 mainpageviewmodel???如何使用我的 ViewModelLocator??

Answer 1

您要注册MainpageViewModel对于 SecondPage与 ViewModelLocationProvider ，从而覆盖约定:

ViewModelLocationProvider.Register<SecondPage, MainpageViewModel>();

...最好在导航到第二页之前:-)