Interaction does not return value (output)

[reelthymeos]

Hello,

I have an interaction that is not returning a result. I was able to get this working for a separate interaction that I defined, and can't for the life of me figure out why this one doesn't work. In my mainViewModel, I defined an interaction as such:

public Interaction<Module, ModuleDetailsViewModel> ModuleDetailsDialog { get; }

I instantiate it inside the constructor of the MainViewModel:

ModuleDetailsDialog = new Interaction<Module, ModuleDetailsViewModel>();

Now what happens in my MainViewModel is that I am subscribed to an event that passes me an object of type 'Module.' That object is ultimately what I supply to my interaction as its input. When that event fires, the below method is called in my MainViewModel:

public async void OnModuleRaised(Module module) //'Module raised' event has fired
{
	var result = await ModuleDetailsDialog.Handle(module);
}

Now, let's look at the code behind for the MainWindow (whos data context is the MainViewModel)

public MainWindow()
 {
        InitializeComponent();

	this.WhenActivated(action =>
	action(ViewModel!.ModuleDetailsDialog.RegisterHandler(DoShowModuleDetailsAsync)));
}


private async Task DoShowModuleDetailsAsync(IInteractionContext<Module, ModuleDetailsViewModel> interaction)
{
	var dialog = new ModuleDetails();
	dialog.DataContext = new ModuleDetailsViewModel(interaction.Input);

	var result = await dialog.ShowDialog<ModuleDetailsViewModel>(this);
	interaction.SetOutput(result);
}

In the ModuleDetailsViewModel, I have a reactiveCommand that a button in the ModuleDetailsView is bound to. It simply returns itself, because I need this object back as the output of the interaction.

public ReactiveCommand<Unit, ModuleDetailsViewModel> UpdateLabels { get; }
UpdateLabels = ReactiveCommand.Create(onUpdateLabel);

private ModuleDetailsViewModel onUpdateLabel()
{
	return this;
}

But when the dialog is called in the main view module, nothing is returned, result is null.

var result = await ModuleDetailsDialog.Handle(module);

This worked for an almost completely equivalent interaction I created, except that that interaction had type 'Unit' (no input needed) as its input as such:

public Interaction<Unit, OtherViewModel> OtherDialog { get; }

in that case, when I awaited the dialog, it came back with an instance of the view model as expected (the interaction's output). Can anyone provide insight into what might be going wrong here?