OnNavigatingFrom wait for async task

[ikondrasovas]

Hi,

How can I make OnNavigatingFrom wait for an async operation to complete before actually navigating from and at the same time do not freeze the UI thread?

For example:

public async void OnNavigatingFrom(FirstFloor.ModernUI.Windows.Navigation.NavigatingCancelEventArgs e)
        {
            await TaskEx.Run(() =>
            {
                System.Threading.Thread.Sleep(5000); //replace by my async operation
            });
        }

Although the method does not return until operation is complete, the navigation is performed immediately. How can I hold navigation until the task is complete?

I opened a similar thread here, but no success so far.

Thank you,

[heraclesaraujo]

I don't think it's possible the way you're trying, maybe you can hold the navigation showing a dialog window with a processing message/animation and close it when your process is finished.

(I haven't tried it)

[ikondrasovas]

What I am doing so far is to cancel the navigation and start an AsyncCommand in the ViewModel.

The ideia is when the command is complete, the VM navigates back using an injected navigation service.

The problem now is that although I managed to implement a navigation service on MUI I still have two separated navigation histories, the one from NavigationService and the other from the ModernFrame, that is used when user clicks on modern links.

How can I unify these histories?

I added a new issue about this matter: https://github.com/firstfloorsoftware/mui/issues/150