Question

当我尝试跟踪位置时，它工作得很好但是当我添加服务引用时它会引发异常当我尝试相同的程序而不添加位置时只添加服务引用它完美地工作从How to continuously track the phone's location for Windows Phone 8

复制时，我的代码如下所示

public partial class MainPage : PhoneApplicationPage
{

    Geolocator geolocator = null;
    bool tracking = false;
    ServiceReference2.GetPositionClient client = new ServiceReference2.GetPositionClient();
    // Constructor
    public MainPage()
    {
        InitializeComponent();

        // Sample code to localize the ApplicationBar
        //BuildLocalizedApplicationBar();
    }
    protected override void OnNavigatedTo(System.Windows.Navigation.NavigationEventArgs e)
    {
        if (IsolatedStorageSettings.ApplicationSettings.Contains("LocationConsent"))
        {
            // User has opted in or out of Location
            return;
        }
        else
        {
            MessageBoxResult result =
                MessageBox.Show("This app accesses your phone's location. Is that ok?",
                "Location",
                MessageBoxButton.OKCancel);

            if (result == MessageBoxResult.OK)
            {
                IsolatedStorageSettings.ApplicationSettings["LocationConsent"] = true;
            }
            else
            {
                IsolatedStorageSettings.ApplicationSettings["LocationConsent"] = false;
            }

            IsolatedStorageSettings.ApplicationSettings.Save();
        }
    }
    private void TrackLocation_Click(object sender, RoutedEventArgs e)
    {
        if ((bool)IsolatedStorageSettings.ApplicationSettings["LocationConsent"] != true)
        {
            // The user has opted out of Location.
            return;
        }

        if (!tracking)
        {
            geolocator = new Geolocator();
            geolocator.DesiredAccuracy = PositionAccuracy.High;
            geolocator.MovementThreshold = 100; // The units are meters.

            geolocator.StatusChanged += geolocator_StatusChanged;
            geolocator.PositionChanged += geolocator_PositionChanged;

            tracking = true;
            TrackLocationButton.Content = "stop tracking";
        }
        else
        {
            geolocator.PositionChanged -= geolocator_PositionChanged;
            geolocator.StatusChanged -= geolocator_StatusChanged;
            geolocator = null;

            tracking = false;
            TrackLocationButton.Content = "track location";
            StatusTextBlock.Text = "stopped";
        }
    }
    void geolocator_StatusChanged(Geolocator sender, StatusChangedEventArgs args)
    {
        string status = "";

        switch (args.Status)
        {
            case PositionStatus.Disabled:
                // the application does not have the right capability or the location master switch is off
                status = "location is disabled in phone settings";
                break;
            case PositionStatus.Initializing:
                // the geolocator started the tracking operation
                status = "initializing";
                break;
            case PositionStatus.NoData:
                // the location service was not able to acquire the location
                status = "no data";
                break;
            case PositionStatus.Ready:
                // the location service is generating geopositions as specified by the tracking parameters
                status = "ready";
                break;
            case PositionStatus.NotAvailable:
                status = "not available";
                // not used in WindowsPhone, Windows desktop uses this value to signal that there is no hardware capable to acquire location information
                break;
            case PositionStatus.NotInitialized:
                // the initial state of the geolocator, once the tracking operation is stopped by the user the geolocator moves back to this state

                break;
        }

        Dispatcher.BeginInvoke(() =>
        {
            StatusTextBlock.Text = status;
        });
    }





    void geolocator_PositionChanged(Geolocator sender, PositionChangedEventArgs args)
    {
        client.getPosCompleted += new EventHandler<ServiceReference2.getPosCompletedEventArgs>(sendData);

        client.getPosAsync(11,11);


        Dispatcher.BeginInvoke(() =>
        {
            LatitudeTextBlock.Text = args.Position.Coordinate.Latitude.ToString("0.00");
            LongitudeTextBlock.Text = args.Position.Coordinate.Longitude.ToString("0.00");
        });
    }


    public void sendData(object sender, ServiceReference2.getPosCompletedEventArgs e)
    {

        dd.Text = e.Result;

    }
    }

Answer 1

你有

client.getPosCompleted += new EventHandler<ServiceReference2.getPosCompletedEventArgs>(sendData);

但是你还没有在其他任何地方给客户端任何值，我假设你得到一个null引用异常，这就是原因。

Answer 2

它只是解决了它，只是设置IIS的错误，因为移动设备和个人电脑在不同的网络上，因此通信是不可能的。我只是在路由器设置中转发端口 -

跟踪Windows Phone 8中的位置时出现异常

2 个答案: