Problem with modal navigation

[BerndStoltefuss]

Hi,

i encounter a strange problem which i can't find a good solution for:
my navigation stack looks like this "/NavigationPage/ViewA/ModalViewB"

Now i want to do something like this in the viewmodel of ModalViewB:
await navigationService.NavigateAsync("../ViewC") which means i would like to pop the ModalViewB and go non modal to ViewC resulting in "/NavigationsPage/ViewA/ViewC".

According to the open issues "../" is currently not supported with a modal view.
So i tried something like this:
await await navigationService.GoBackSync(); // ok
await navigationService.NavigateAsync("ViewC"); // which fails with the following error:
`
MauiProgram.LogNavigation|Navigation: GoBack, Result: Success

MauiProgram.LogNavigation|Navigation: ViewC, Result: Failed, Exception: Prism.Ioc.ContainerResolutionException: An unexpected error occurred while resolving 'Prism.Navigation.INavigationRegistry'
---> System.NullReferenceException: Object reference not set to an instance of an object.
at DryIoc.Resolver.Resolve(IResolver resolver, Type serviceType, Object[] args, IfUnresolved ifUnresolved, Type requiredServiceType, Object serviceKey) in /_/src/DryIoc/Container.cs:line 8570
at Prism.DryIoc.DryIocContainerExtension.DryIocScopedProvider.Resolve(Type type, ValueTuple2[] parameters) --- End of inner exception stack trace --- at Prism.DryIoc.DryIocContainerExtension.DryIocScopedProvider.Resolve(Type type, ValueTuple2[] parameters)
at Prism.DryIoc.DryIocContainerExtension.DryIocScopedProvider.Resolve(Type type)
at Prism.Ioc.IContainerProviderExtensions.Resolve[INavigationRegistry](IContainerProvider provider)
at Prism.Navigation.PageNavigationService.get_Registry()
at Prism.Navigation.PageNavigationService.ProcessNavigationForContentPage(Page currentPage, String nextSegment, Queue1 segments, INavigationParameters parameters, Nullable1 useModalNavigation, Boolean animated)
at Prism.Navigation.PageNavigationService.ProcessNavigation(Page currentPage, Queue1 segments, INavigationParameters parameters, Nullable1 useModalNavigation, Boolean animated)
at Prism.Navigation.PageNavigationService.NavigateAsync(Uri uri, INavigationParameters parameters)
`

I get the same error when trying to use "../ViewC" without GoBackAsync(). But this is not supposed to be supported atm.

When instead doing:
await navigationService.NavigateAsync("ViewC") it works, but is in modal stack
await navigationService.NavigateAsync("/NavigationPage/ViewA/ViewC") it works, but i don't want an absolute Path

Not sure what triggers this strange error and how to work around it. Of course i can tell ViewModelA to do the desired navigation by providing some navigation hint in GoBackAsync, but that's a rather ugly workaround.

Regards,

Bernd

[brianlagunas]

As you know, relative navigation is not supported with modal. You also can't remove a view from the nav stack with GoBack and then immediately navigate again because that view is no longer part of the navigation stack, so it will fail. One approach you could take it to send a parameter to the previous page in the modal GoBack that tell the page to perform its own relative goback.

[BerndStoltefuss]

Did that. Works. Not the most elegant solution, but i am fine for now,-)

Thanks!