GeoCoordinateWatcher.OnPositionChanged 方法

定义

命名空间:

System.Device.Location

程序集:

System.Device.dll

在 PositionChanged 事件发生时调用。

C#

protected void OnPositionChanged (System.Device.Location.GeoPositionChangedEventArgs<System.Device.Location.GeoCoordinate> e);

参数

e

GeoPositionChangedEventArgs<GeoCoordinate>

包含新位置的 GeoPositionChangedEventArgs<T> 对象。

示例

以下程序演示如何从 PositionChanged 事件订阅连续更新。

C#

using System;
using System.Device.Location;

namespace GetLocationEvent
{
    class AsyncProgram
    {
        static void Main(string[] args)
        {
            CLocation myLocation = new CLocation();
            myLocation.GetLocationEvent();
            Console.WriteLine("Enter any key to quit.");
            Console.ReadLine();
        }
        class CLocation
        {
            GeoCoordinateWatcher watcher;

            public void GetLocationEvent()
            {
                this.watcher = new GeoCoordinateWatcher();
                this.watcher.PositionChanged += new EventHandler<GeoPositionChangedEventArgs<GeoCoordinate>>(watcher_PositionChanged);
                bool started = this.watcher.TryStart(false, TimeSpan.FromMilliseconds(2000));
                if (!started)
                {
                    Console.WriteLine("GeoCoordinateWatcher timed out on start.");
                }
            }

            void watcher_PositionChanged(object sender, GeoPositionChangedEventArgs<GeoCoordinate> e)
            {
                PrintPosition(e.Position.Location.Latitude, e.Position.Location.Longitude);
            }

            void PrintPosition(double Latitude, double Longitude)
            {
                Console.WriteLine("Latitude: {0}, Longitude {1}", Latitude, Longitude);
            }
        }
    }
}

适用于