Silverlight, Windows Phone 7 Mango + NavigationServices.Navigate()?

Question

Microsoft Silverlight

The essence of the problem: when calling NavigationServices.Navigate () from a class belonging to some xaml-view, the navigation works, but when called from any auxiliary class, for some reason it doesn’t.
For example:
page MainPage.xaml, class MainPage.xaml.cs, method

NavigationServices.Navigate( new Uri("/listItems", UriKind.Relative/Absolute) )

Works.
There is also a JSON-RPC class that is used to implement communication with the server. Now, if you call Navigate () in it, then the function always returns "FileNotFound".
Function example:

public void processResponce(item Response)
{
    try
    {
        var token = Response.result.token;
        this.setToken("&token=" + token);
        Debug.WriteLine(this.apiUrl);

        (Application.Current.RootVisual as PhoneApplicationFrame).Navigate(new Uri("/listItems", UriKind.Relative));
    }
    catch
    {
        Deployment.Current.Dispatcher.BeginInvoke(() =>
            {
                var messageFromServer = Response.error.message;
                MessageBox.Show(messageFromServer);

                Debug.WriteLine(messageFromServer);
            });
    }
}

Does not work.
On the ninth line of this function, an exception is thrown about a non-existent file.
This example uses UriMapping, so the Uri is like this. I also tried to specify the full path - it does not help.
Perhaps there are some restrictions that I am not aware of?

Answer 1

I'm a fool. Killed 4 hours for this. But the answer is right there! :)
If anyone encounters a similar issue, here is the answer:

  Deployment.Current.Dispatcher.BeginInvoke(() =>
                    {
                        (Application.Current.RootVisual as PhoneApplicationFrame).Navigate(new Uri("/listItems", UriKind.Relative));
                    });

It was just necessary to call BeginInvoke so that the application also did not swear at the lack of access rights.