如何重定向到另一个 XAML 页面 Windows Phone C#

我有以下代码，可以确定已发布的请求（对外部api）的状态是否成功，如果是，它应该导航到我在Windows Phone应用程序中创建的Interface.xaml页面。不确定哪个类处理在 xaml 页面之间导航

public bool UsernameAndPassword(string username, string password)
{
    data = "grant_type=" + GRANTTYPE + "&username=" + username + "&password=" + password + "&client_id=" + CLIENTID + "&redirect_uri=" + REDIRECTURI + "&client_secret=" + CLIENTSECRET;
    return true;
}
public bool Authenticate()
{
    // form the URI
    UriBuilder fullUri = new UriBuilder(urlPath);
    fullUri.Query = data;
    // initialize a new WebRequest
    HttpWebRequest request = (HttpWebRequest)WebRequest.Create(fullUri.Uri);
    request.Method = "POST";
    // set up the state object for the async request
    DataUpdateState dataState = new DataUpdateState();
    dataState.AsyncRequest = request;
    // start the asynchronous request
    request.BeginGetResponse(new AsyncCallback(HandleResponse),
        dataState);
    return true;
}
private void HandleResponse(IAsyncResult asyncResult)
{
    // get the state information
    DataUpdateState dataState = (DataUpdateState)asyncResult.AsyncState;
    HttpWebRequest dataRequest = (HttpWebRequest)dataState.AsyncRequest;
    // end the async request
    dataState.AsyncResponse = (HttpWebResponse)dataRequest.EndGetResponse(asyncResult);
    if (dataState.AsyncResponse.StatusCode.ToString() == "OK")
    {
        // What needs to go here to navigate to another xaml page?
        // something like this? - NavigationService.Navigate(new Uri("Interface.xaml", UriKind.Relative));    
    }
}
public class DataUpdateState
{
    public HttpWebRequest AsyncRequest { get; set; }
    public HttpWebResponse AsyncResponse { get; set; }
}

该问题可以在 if 语句的 HandleResponse 方法中找到。

//编辑：：

我

现在已经扩展了PhoneApplicationPage类，它使我可以访问导航服务...但是，当我现在执行我的程序时，当我使用以下方法导航到新页面时：

NavigationService.Navigate(new Uri("Interface.xaml", UriKind.Relative));

它会抛出运行时错误：

An exception of type 'System.UnauthorizedAccessException' occurred in System.Windows.ni.dll but was not handled in user code
If there is a handler for this exception, the program may be safely continued.

有什么想法吗？

(Application.Current.RootVisual as PhoneApplicationFrame).Navigate(new Uri("/UserDetail.xaml", UriKind.Relative));

Messenger.Default.Register<NavigateMessage>(this, (navigateMessage) =>
{
  Deployment.Current.Dispatcher.BeginInvoke(() =>
  {
    ApplicationParameter = navigateMessage.Parameter;
    RootFrame.Navigate(navigateMessage.Destination);
  });
});