getgepositionasync需要很长时间才能完成
本文关键字:长时间 getgepositionasync | 更新日期: 2023-09-27 18:10:38
当前我使用这个代码来获取GPS:
Geolocator geolocator = new Geolocator();
geolocator.DesiredAccuracy = PositionAccuracy.Default;
geolocator.DesiredAccuracyInMeters = 50;
try
{
Geoposition currentPosition = await geolocator.GetGeopositionAsync(TimeSpan.FromSeconds(120), TimeSpan.FromSeconds(30));
MyCoordinate = new GeoCoordinate(currentPosition.Coordinate.Latitude, currentPosition.Coordinate.Longitude);
}
catch (Exception ex)
{
if (ex.Message.Contains("This operation returned because the timeout period expired."))
{
MessageBox.Show("GPS is taking too long too complete. Pleaes try again.");
this.SetProgressIndicator(false);
RadBusyIndicator.IsRunning = false;
return;
}
else
{
this.SetProgressIndicator(false);
RadBusyIndicator.IsRunning = false;
return;
}
};
但是它总是需要很长时间才能完成,正如你可以看到的,我设置了timeout 30s,但不确定为什么当超过30秒时,它不会显示超时异常。我被这个问题难住了。有人知道吗?
确保wifi或手机设备处于开启状态,这样可以在GPS设备找不到信号时使用回退方法。
一个或多或少有相同问题的人在这里做了另一个帖子:
getgepositionasync不返回
关于GeoLocator类的更多信息:http://msdn.microsoft.com/en-us/library/windows/apps/windows.devices.geolocation.geolocator属性
我也不知道为什么,但是TimeSpan
真的很慢,但是用ReportInterval
做这件事很好:
geolocator = new Geolocator();
geolocator.DesiredAccuracy = PositionAccuracy.High;
geolocator.ReportInterval = 2000;
geolocator.PositionChanged += geolocator_PositionChanged;
private void geolocator_PositionChanged(Geolocator sender, PositionChangedEventArgs args)
{
try
{
Dispatcher.BeginInvoke(() =>
{
myPosition = args.Position.Coordinate.ToGeoCoordinate();
});
}
catch(Exception ex)
{
if (ex.Data == null) throw;
else MessageBox.Show("Exception while Tracking: " + ex.InnerException.ToString());
}
}