solution for navigation from a service

[mo-kml]

hi there
im using odata for my server integration and xamarin forms for my client side.i have a service that passes odata context to another view models. i wanna sign out the user when odata response be unAuthorize error. but i have a problem. i wanna navigate user to login page from my service. but i not able to do this. what solution do you suggest to make this right?
this is what i want to do but without a view model i cant do that.

private void ServerContext_ReceivingResponse(object sender, ReceivingResponseEventArgs e)
{
if (!e.ResponseMessage.Headers.Any(h => h.Key == "X-CorrelationId"))
{
_dialogService.DisplayAlertAsync("Authentication Failed", "Authentication Failed.Please Login again", "Ok");
_navigationService.NavigateAsync(nameof(CompanyLoginView));
}
}

Actually ive tries MessagingCenter of xamarin to do so but it didnt work out.
I sent a message from my service that you have been logout

private void ServerContext_ReceivingResponse(object sender, ReceivingResponseEventArgs e)
{
if (!e.ResponseMessage.Headers.Any(h => h.Key == "X-CorrelationId"))
{
MessagingCenter.Send(this, "Logout");
}
}

and in constructor of my view model i navigate to another page but navigation didn't work. also IPageDialogService also didnt work and throw an exception.

MessagingCenter.Subscribe(this, "Logout",(sender) =>
{
_navigationService.NavigateAsync("CompanyLoginView");
_dialogService.DisplayAlertAsync("Error", "Please select void reason", "Ok");
});

• Platform: Xamarin forms shared project
• Prism version: 6.3.0
• Xamarin version (if applicable): 2.3.4.247

[brianlagunas]

You shouldn't try to navigate within the service. Your service should provide you with a response and you navigate after receiving that response in your ViewModel.

[mo-kml]

@brianlagunas actually i am doing this. i`m using MessagingCenter of Xamarin forms to send a message to my ViewModel that my authentication has been expired. but even when i use MessageCenter and navigate from my ViewModel it wont navigate or even not display alert with dialogService

[brianlagunas]

Then you have a different problem in your code. Unfortunately, there is not enough detail or information provided to help you pin point the issue. I suggest debugging every aspect of that view to make sure everything functions properly prior to invoking it with a message.

[lock]

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