ViewModelLocator in prism mvvm - mvvm

Question

Here is my Scenario,I need to create a simple uwp app and I have got a single viewmodel and multiple views..I am using prism mvvm/unity .
MainPage.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);
);
}
}
SecondPage.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>
App.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
}
}
Now the problem occurs..How can I bind my secondpage to mainpageviewmodel???How to use my ViewModelLocator??

Answer 1

You want to register MainpageViewModel for SecondPage with the ViewModelLocationProvider, thus overriding the convention:
ViewModelLocationProvider.Register<SecondPage, MainpageViewModel>();
...preferably before navigating to the second page :-)