Not able to navigate to pages on Windows Metro App using c#

Question

When my UserLogin page loads, i want to check for user database, and if it doesn't exist, or can't be read, i want to direct it to NewUser page.

protected override void OnNavigatedTo(NavigationEventArgs e)
{
    CheckForUser();
    if (UserExists == false)
        this.Frame.Navigate(typeof(NewUser));
}

The problem is that it never navigates to NewUser, even when i comment out the if condition.

have you check MSDN ** here is a link http://msdn.microsoft.com/en-us/library/windows/apps/br211386.aspx ** — MethodMan, Dec 11 '12 at 17:13
I did not think you could navigate in the `OnNavigatedTo` method because you are still in the middle of a navigation. — Trisped, Dec 12 '12 at 02:36

score 14 · Accepted Answer · answered Dec 12 '12 at 05:40

14

Navigate can't be called directly form OnNavigatedTo method. You should invoke your code through Dispatcher and it will work:

protected override void OnNavigatedTo(NavigationEventArgs e)
{
    base.OnNavigatedTo(e);
    CheckForUser();
    if (UserExists == false)
        Dispatcher.RunAsync(CoreDispatcherPriority.Normal, 
                            () => this.Frame.Navigate(typeof(NewUser)));
}

answered Dec 12 '12 at 05:40

Damir Arh

17,637
2
45
83

Be sure to call base.OnNavigatedTo(e) at the top of your overrided method call. I had this same code, minus the base.OnNavigatedTo(e) and I was still getting an exception. This answer helped me out, thank you! – Allen Rufolo Nov 15 '16 at 18:38

score 1 · Answer 2 · answered Oct 04 '14 at 13:06

This happens because your app tries to navigate before the current frame completely loaded. Dispatcher could be a nice solution, but you have to follow the syntax bellow.

using Windows.UI.Core;

    private async void to_navigate()
    {
        await Dispatcher.RunAsync(CoreDispatcherPriority.Normal, () => this.Frame.Navigate(typeof(MainPage)));
    }

Replace MainPage with your desired page name.
Call this to_navigate() function.

score 0 · Answer 3 · answered Dec 11 '12 at 17:15

you can try this and see if this works

frame.Navigate(typeof(myPage)); // the name of your page replace with myPage

full example

    var cntnt = Window.Current.Content;
    var frame = cntnt as Frame;

    if (frame != null)
    { 
        frame.Navigate(typeof(myPage));
    }
    Window.Current.Activate();

or

if you want to use a 3rd party tool like Telerik try this link as well

Classic Windows Forms, Stunning User Interface

score 0 · Answer 4 · answered Dec 12 '12 at 02:24

I see you override OnNavigatedTo method but do not call base method. It may be the source of problem. Try calling base method before any logic:

protected override void OnNavigatedTo(NavigationEventArgs e)
{
    base.OnNavigatedTo(e);
    CheckForUser();
    if (UserExists == false)
        this.Frame.Navigate(typeof(NewUser));
}

score 0 · Answer 5 · answered Dec 13 '12 at 16:03

0

Use Dispatcher.RunIdleAsync to postpone your navigation to another page until UserLogin page is completely loaded.

answered Dec 13 '12 at 16:03

maxim pg

701
4
9

score 0 · Answer 6 · answered May 19 '14 at 01:54

0

The others are correct, but since Dispatcher doesn't work from the view model, here's how to do it there:

SynchronizationContext.Current.Post((o) =>
{
    // navigate here
}, null);

answered May 19 '14 at 01:54

Chris Bordeman

255
7
19

Not able to navigate to pages on Windows Metro App using c#

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