无法将ViewModel绑定到View，这是带有ReactiveUI的ListViewItem DataTemplate的一部分

Question

I'm having some issues trying to display a view in a ListViewItem Data template in reactive. I have a ListView in, for example ReceiptView.xaml whose source is bound like such

this.WhenActivated(d =>
  {
     this.OneWayBind(ViewModel, vm => vm.Items, view => 
                    view.ReceiptListView.ItemsSource).DisposeWith(d);
  });

where in ReceiptViewModel - Items is an IObservableCollection<ItemsViewModel>

The ItemTemplate for the ListView is as such

<DataTemplate x:Key="ItemTemplate" DataType="{x:Type viewModel:ItemViewModel}">
       <DockPanel
              Width="{Binding Path=ViewportWidth, RelativeSource={RelativeSource AncestorType={x:Type ScrollViewer}}}"
              Margin="0,5"
              HorizontalAlignment="Left"
              Background="Transparent">
              <views:ItemView />
         </DockPanel>
 </DataTemplate>

It is here where I'm unsure whether to use this mechanism for displaying the view or the ViewModelViewHost ViewModel="{Binding ItemViewModel}"..

My ItemView.xaml.cs is as such

public partial class ItemView : ReactiveUserControl<ItemViewModel>, ISupportsActivation
{
    public ItemView()
    {
        Activator = new ViewModelActivator();

        InitializeComponent();

        this.WhenActivated(d =>
        {
            this.Bind(ViewModel, vm => vm.Name, v => v._Name.Text).DisposeWith(d);
        });
  }
}

Currently with the usage above, it never goes into the WhenActivated function, if I remove the ISupportsActivation functionality, it just crashes out with the message ViewModel is null. I was wondering what the correct way is to get something like this working?

I have tried using ViewModelViewHost and setting the ViewModel property inside the DataTemplate instead of above but it doesn't even reach the ItemView.xaml.cs backing code. The dependencies are setup initially like:

dependencyResolver.Register(() => new ItemView(), typeof(IViewFor<ItemViewModel>));

Answer 1

The solution, in respect of actually getting it to work, was a matter of binding issue. I needed to use ViewModelViewHost ViewModel="{Binding .}" within the DataTemplate.