Question

在我的Windows手机应用程序中，我使用以下代码获取当前位置

        private void GetCoordinate()
    {
        var watcher = new GeoCoordinateWatcher(GeoPositionAccuracy.High)
        {
            MovementThreshold = 2
        };
        watcher.PositionChanged += this.watcher_PositionChanged;
        watcher.StatusChanged += this.watcher_StatusChanged;
        watcher.Start();
    }

    void watcher_StatusChanged(object sender, GeoPositionStatusChangedEventArgs e)
    {
        switch (e.Status)
        {
            case GeoPositionStatus.Disabled:
                MessageBox.Show("Current position not available!!");
                break;
            case GeoPositionStatus.NoData:
                MessageBox.Show("Current position not available!!");
                break;
        }
    }

    private void watcher_PositionChanged(object sender, GeoPositionChangedEventArgs<GeoCoordinate> e)
    {
        try
        {
            var pos = e.Position.Location;
            StaticData.currentCoordinate = new GeoCoordinate(pos.Latitude, pos.Longitude);
        }
        catch (Exception ex)
        {
            MessageBox.Show(ex.Message);
        }
    }

如上所示，我在应用程序页面的页面加载事件中调用GetCoordinate方法。通过使用GPS坐标值，我启用或禁用了页面上的某些控件。但在这里，问题是首先执行页面加载代码，然后我们得到Gps坐标值..

我需要GPS中的pageload坐标值。请建议

Answer 1

您应该在页面加载中启动观察者，并且一旦GeoCoordinateWatcher收集GeoCoordinate值，它就会触发PositionChanged事件，您将在其中编码以启用禁用控件。

所以现在你的代码看起来像这样

  private void GetCoordinate()
    {
        var watcher = new GeoCoordinateWatcher(GeoPositionAccuracy.High)
        {
            MovementThreshold = 2
        };
        watcher.PositionChanged += this.watcher_PositionChanged;
        watcher.StatusChanged += this.watcher_StatusChanged;
        watcher.Start();
    }

private void watcher_PositionChanged(object sender, GeoPositionChangedEventArgs<GeoCoordinate> e)
    {
        try
        {
            var pos = e.Position.Location;
            if(position==required one)
             {
                //enable disable here  
             }
            StaticData.currentCoordinate = new GeoCoordinate(pos.Latitude, pos.Longitude);
        }
        catch (Exception ex)
        {
            MessageBox.Show(ex.Message);
        }
    }

如何解决在Windows Phone中使用Async定位服务的问题？

1 个答案: