GeoCoordinateWatcher.PositionChanged Событие

public:
 event EventHandler<System::Device::Location::GeoPositionChangedEventArgs<System::Device::Location::GeoCoordinate ^> ^> ^ PositionChanged;

public event EventHandler<System.Device.Location.GeoPositionChangedEventArgs<System.Device.Location.GeoCoordinate>> PositionChanged;

member this.PositionChanged : EventHandler<System.Device.Location.GeoPositionChangedEventArgs<System.Device.Location.GeoCoordinate>> 

Public Custom Event PositionChanged As EventHandler(Of GeoPositionChangedEventArgs(Of GeoCoordinate)) 

Public Event PositionChanged As EventHandler(Of GeoPositionChangedEventArgs(Of GeoCoordinate)) 

Тип события

Реализации

Примеры

В следующем примере показано, как обрабатывать первое PositionChanged событие.

using System;
using System.Device.Location;

namespace LocationEvent1
{
    class Program
    {
        static void Main(string[] args)
        {
            GeoCoordinateWatcher watcher;
            watcher = new GeoCoordinateWatcher();

            watcher.PositionChanged += (sender, e) =>
            {
                var coordinate = e.Position.Location;
                Console.WriteLine("Lat: {0}, Long: {1}", coordinate.Latitude,
                    coordinate.Longitude);
                // Uncomment to get only one event.
                // watcher.Stop();
            };

            // Begin listening for location updates.
            watcher.Start();
        }
    }
}

Imports System.Device.Location

Module GetLocationEvent
    Public Class CLocation
        Private WithEvents watcher As GeoCoordinateWatcher
        Public Sub GetLocationDataEvent()
            watcher = New System.Device.Location.GeoCoordinateWatcher()
            AddHandler watcher.PositionChanged, AddressOf watcher_PositionChanged
            watcher.Start()

        End Sub

        Private Sub watcher_PositionChanged(ByVal sender As Object, ByVal e As GeoPositionChangedEventArgs(Of GeoCoordinate))
            PrintPosition(e.Position.Location.Latitude, e.Position.Location.Longitude)
            ' Uncomment the following to stop receiving updates after the first one.
            ' watcher.Stop()
        End Sub

        Private Sub PrintPosition(ByVal Latitude As Double, ByVal Longitude As Double)
            Console.WriteLine("Latitude: {0}, Longitude {1}", Latitude, Longitude)
        End Sub
    End Class


    Public Sub Main()
        Dim myLocation As New CLocation()
        myLocation.GetLocationDataEvent()
        Console.WriteLine("Enter any key to quit.")
        Console.ReadLine()
    End Sub

End Module

Комментарии

Это событие возникает только при перемещении расстояния с момента последнего события превышает пороговое значение, указанное в параметре MovementThreshold.

Объект GeoPositionChangedEventArgs<T> , переданный обработчику событий, включает GeoPosition<T> объект, содержащий обновленные данные расположения.

См. также раздел

• MovementThreshold