An error is occur when we use navigation to move other page

问题

using System;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Navigation;

namespace WindowsPhoneApplication7
{
    public partial class Listbox : UserControl
    {
        public Listbox()
        {
            InitializeComponent();
        }

        private void listbox(object sender, MouseEventArgs e)
        {
            this.NavigationService.Navigate(new Uri("/home.xaml", UriKind.Relative));
        }
    }
}

An error is occur ....... does not contain a definition for 'NavigationService' and no extension method 'NavigationService' accepting a first argument of type ' could be found (are you missing a using directive or an assembly reference?)

回答1:

NavigationService is a property on the PhoneApplicationPage class. You are not deriving from that class, you are deriving from UserControl.

You need to get the parent phone page the user control is on and get the NavigationService reference from there.

Your compiler error is because it cannot locate a definition for NavigationService on the Listbox class you have made.

回答2:

What Adam said is correct. But a easy solution is to define following static utility methods in App.xaml.cs

public static PhoneApplicationFrame CurrentRootVisual
{
    get
    {
        return (App.Current.RootVisual as PhoneApplicationFrame);
    }
}

public static bool Navigate(Uri source)
{
    if (CurrentRootVisual != null)
        return CurrentRootVisual.Navigate(source);

    return false;
}

public static void GoBack()
{
    if (CurrentRootVisual != null)
        CurrentRootVisual.GoBack();
}

Then you can just do:

App.Navigate(yourNavigateUri)

or App.GoBack()

From anywhere you like!

回答3:

Dispatcher.BeginInvoke(() =>
    NavigationService.Navigate(new Uri("/home.xaml", UriKind.Relative)));

来源：https://stackoverflow.com/questions/6830123/an-error-is-occur-when-we-use-navigation-to-move-other-page

标签

windows-phone-7