c# – Windows Universal(UWP)地理位置API权限

Starting in Windows 10,call the RequestAccessAsync method before accessing the user’s location. At that time,your app must be in the foreground and RequestAccessAsync must be called from the UI thread.

我在UI线程上运行一些非常简单的Geolocation代码,如下所示,但我每次都获得“拒绝”的位置权限,并且没有提示允许位置权限.有没有其他人遇到这个？如何获得在Windows 10应用程序中允许地理位置的位置权限的提示？

地理定位方法

private async Task<ForecastRequest> GetPositionAsync()
    {
        try
        {

            // Request permission to access location
            var accessStatus = await Geolocator.RequestAccessAsync();

            if (accessStatus == GeolocationAccessStatus.Allowed)
            {
                // Get cancellation token
                _cts = new CancellationTokenSource();
                CancellationToken token = _cts.Token;

                // If DesiredAccuracy or DesiredAccuracyInMeters are not set (or value is 0),DesiredAccuracy.Default is used.
                Geolocator geolocator = new Geolocator { DesiredAccuracyInMeters = _desireAccuracyInMetersValue };

                // Carry out the operation
                _pos = await geolocator.GetGeopositionAsync().AsTask(token);

                return new ForecastRequest()
                {
                    Lat = (float)_pos.Coordinate.Point.Position.Latitude,Lon = (float)_pos.Coordinate.Point.Position.Longitude,Unit = Common.Unit.us
                };
            }
            else
                throw new Exception("Problem with location permissions or access");

        }
        catch (TaskCanceledException tce)
        {
            throw new Exception("Task cancelled" + tce.Message);
        }
        finally
        {
            _cts = null;
        }
    }

它被称为：

protected async override void OnNavigatedTo(NavigationEventArgs e)
    {
        base.OnNavigatedTo(e);

        ForecastViewModel vm = await ForecastViewModel.BuildViewModelAsync(await GetPositionAsync());
        DataContext = vm.Forecast;

        uxForecastList.Visibility = Visibility.Visible;
    }