GeoCoordinateWatcher.TryStart在C#中无法正常工作 [英] GeoCoordinateWatcher.TryStart doesn't work properly in C#

问题描述

我对以下代码有问题，即它没有显示权限提示，因此我无法授予应用程序访问我的位置的权限，并且不起作用.

I'm having an issue with the following code, namely that it doesn't show a Permission Prompt, therefore I can't give the application access to my location and doesn't work.

public Tuple<double, double> GetDeviceLocation()
{
    GeoCoordinateWatcher watcher = new GeoCoordinateWatcher();

    watcher.TryStart(false, TimeSpan.FromMilliseconds(1000));

    GeoCoordinate coord = watcher.Position.Location;

    if (coord.IsUnknown != true)
    {
        return Tuple.Create(coord.Latitude, coord.Longitude);
    }
}

推荐答案

我看过Microsoft文档，并且有一些吸引我的注意力.

I've looked microsoft documents and there's something that catches my attention.

相对于坐标必须移动的距离(以米为单位)从上一个PositionChanged事件开始，在位置提供者之前引发另一个PositionChanged事件.

The distance that must be moved, in meters, relative to the coordinate from the last PositionChanged event, before the location provider raises another PositionChanged event.

备注

默认运动阈值为零，这意味着任何当前位置提供商检测到的位置变化会导致PositionChanged事件和Position属性的更新.

The default movement threshold is zero, which means that any change in location detected by the current location provider causes a PositionChanged event and an update in the Position property.

   // Get location
   CLocation myLocation = new CLocation();
   myLocation.GetLocationEvent();

您必须注册 PostionChange 事件以获取位置信息

You must be register PostionChange event to get location information

在需要的地方使用位置信息类(CLocation).

Use the location class (CLocation) where do you need.

地理位置信息 MSDN

    public 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);
    }
}

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