Passing parameters back

I’m trying to understand how the new navigation works in 10.2. What I’m trying to do is this:

1. Navigate to ListPage.
2. Navigate to DetailPage.
3. Navigate to EditPage.
4. Navigate back to DetailPage.

From my ListPageViewModel I create my path and navigate:

public async void ViewItem(Item item)
{
    // _navigationService.GetNavigationPath(true) = "/ListPage".
    var path = PathBuilder.Create(nameof(DetailPage), ("itemId", item.Id)).ToString();
    await _navigationService.NavigateAsync(path, null, new DrillInNavigationTransitionInfo());
}

Then, to edit the item from my DetailPageViewModel:

public async void EditItem(Item item)
{
    // _navigationService.GetNavigationPath(true) = "/DetailPage?itemId=5cfb0eda-cdbd-4b08-b29b-dff2ef07ea77/ListPage?"
    var path = PathBuilder.Create(nameof(EditPage), ("itemId", item.Id)).ToString();
    await _navigationService.NavigateAsync(path);
}

First off, that path seems really strange to me. According to #1620, performing this nested navigation manually would look like “/ListPage/DetailPage?itemId=5cfb0eda-cdbd-4b08-b29b-dff2ef07ea77”, so I don’t understand why my url looks so weird here. But all the same, the navigation does work correctly.

However, when I go back, in my DetailPageViewModel…

public override void OnNavigatedTo(INavigationParameters parameters)
{
    // _navigationService.GetNavigationPath(true) = "/EditPage?itemId=5cfb0eda-cdbd-4b08-b29b-dff2ef07ea77/ListPage?"
    var itemId = parameters.GetValue<string>("itemId");    // parameters is empty.
}

Once again, that path seems extremely strange. “DetailPage” isn’t even present. Also, I don’t get my id parameter handed to my DetailPageViewModel again, as I would expect to. Of course, this means my app crashes or doesn’t perform correctly since it can’t find the necessary data.

Am I grossly misunderstanding how this is supposed to work, or is this broken?

[JerryNixon]

@TastesLikeTurkey Create a new issue if you see anything else.

[ShawnTheBeachy]

@JerryNixon Glad I could help!