Navigation from user control in win 7 phone

I am not able to call the navigation service from the user control. even when I create one event handler on the main page to call the navigation se开发者_如何学编程rvice that is laos not working.

Can you please help me?

I think I see the problem, but like Austin indicated, there isn't much to go on in your initial description. It sounds like you are trying to access the NavgationService (which is a PhoneApplicationPage property) from within a UserControl that you are placing on that page.

As with many things in these APIs, you have a couple of options. First, you can access the PhoneApplicationFrame (which contains your pages and manages navigation) and use it for navigation:

var frame = App.Current.RootVisual as PhoneApplicationFrame;
frame.Navigate(new Uri("/TargetPage.xaml", UriKind.Relative));

Alternatively, you can walk the control's Visual Tree using the VisualTreeHelper until you get to the containing page:

var page = GetParentOfType<PhoneApplicationPage>(this); // this is your user control


private static T GetParentOfType<T>(DependencyObject item) where T : DependencyObject
{
    if (item == null) throw new ArgumentNullException("item");
    T result;
    var parent = VisualTreeHelper.GetParent(item);
    if (parent == null) return null;
    else if (parent.GetType().IsSubclassOf(typeof(T))
    {
          result = (T)parent;
    }
    else result = GetParameterOfType<T>(parent);
    return result;
}

As you see, the VisualTree approach involves more code, but gets you the containing page object, where you have more access to things like NavigationContext, etc.

Hope that was your question (and your answer.)