navigationservice has no constructors defined

Question

I am using Visual Studio Express 2012 for Windows Phone and building an app targeting Windows Phone 7.1.

I am trying to use NavigationService to navigate to a different page but I keep running into problems.

Here is my code:

private void GotoDetails(object _url)
    {
        var url = string.Format("/DetailsPage.xaml?url={0}", _url.ToString());
        NavigationService nav = new NavigationService();
        nav.Navigate(new Uri(url, UriKind.Relative));
    }

when I try to build this I get a "The type 'System.Windows.Navigation.NavigationService' has no constructors defined" on the NavigationService nav =.... line.

If I try to do just NavigationService.Navigate(new Uri(url, UriKind.Relative)); then I get a "An object reference is required for the non-static field, method, or property 'System.Windows.Navigation.NavigationService.Navigate(System.Uri)'" error.

update: I am trying to use MVVM (for the first time). This code resides in my view model. I am not using any frameworks. Just trying to learn it from scratch.

I have searched the intertubes but cannot seem to find a solution.

Any help is much appreciated.

Kamal

Answer 1

are you inside a page? NavigationService is a property of the Page class: http://msdn.microsoft.com/en-us/library/system.windows.controls.page.navigationservice(v=vs.92).aspx