我正在尝试通过导航服务传递名为 MyGeoPosition
的地理位置变量,但我认为我在某个地方遇到了一个错误之一它给予geopositon doesn't exist in the current context
在第一类,我通过这样的变量:
private async void setLocationBtn_Click(object sender, RoutedEventArgs e)
{
await this.GetCoordinates();
//NavigationService.Navigate(new Uri("/Maps.xaml", UriKind.Relative));
this.NavigationService.Navigate(new Uri(string.Format("/Maps.xaml?GeoX={0}&GeoY={1}", MyGeoPosition), UriKind.Relative));
}
获取位置的方法:
private async Task GetCoordinates(string name = "My Car")
{
await Task.Run(async () =>
{
// Get the phone's current location.
Geolocator MyGeolocator = new Geolocator();
MyGeolocator.DesiredAccuracyInMeters = 5;
Geoposition MyGeoPosition = null;
try
{
MyGeoPosition = await MyGeolocator.GetGeopositionAsync(TimeSpan.FromMinutes(1), TimeSpan.FromSeconds(10));
}
catch (UnauthorizedAccessException)
{
MessageBox.Show("Location is disabled in phone settings or capabilities are not checked.");
}
catch (Exception ex)
{
// Something else happened while acquiring the location.
MessageBox.Show(ex.Message);
}
});
}
第二类我要检索可变数据:
protected override void OnNavigatedTo(NavigationEventArgs e)
{
if (NavigationContext.QueryString.ContainsKey("MyGeoPosition"))
{
var MyGeoPosition = new GeoCoordinate(geoposition.Coordinate.Latitude, geoposition.Coordinate.Longitude);
}
base.OnNavigatedTo(e);
}
没有安装电话SDK,但会尝试一下。看来Naviagtion参数弄错了。将纬度和长度作为参数,如我的草图中所示,然后从参数中恢复您的位置。钥匙必须匹配导航URI中的参数。
第一类:
this.NavigationService.Navigate(new Uri(string.Format("/Maps.xaml?GeoLat={0}&GeoLong={1}", MyGeoPosition.Coordinate.Latitude,MyGeoPosition.Coordinate.Longitude), UriKind.Relative));
第二类:
if (NavigationContext.QueryString.ContainsKey("GeoLat") && NavigationContext.QueryString.ContainsKey("GeoLong"))
{
var latitude = NavigationContext.QueryString["GeoLat"];
var longtitude = NavigationContext.QueryString["GeoLong"];
var MyGeoPosition = new GeoCoordinate(latitude , longtitude );
}
您可能必须修复一些小错误,我在没有VS的情况下输入了它。
请参阅:http://msdn.microsoft.com/en-us/library/windows/apps/windows.devices.geolocation 和http://msdn.microsoft.com/en-us/library/windows/apps/windows.devices.geolocation.geocoortion
获得价值的更好方法是trygetValue()
string latitude;
if(NavigationContext.QueryString.TryGetValue(“GeoLat”,out latitude))
喜欢他们在这里显示:
developer.nokia.com/community/wiki/how_to_pass_strings_between_pages_on_windows_phone_phone