windows phone 7 定位（擷取經緯度）,然後找到經緯度所在的位置(城市資訊)

 

 

前幾天做項目用到, 代碼貼給大家。

/// <summary>        /// 擷取當前位置的經緯度        /// </summary>        /// <returns></returns>   public static double[] GetLocationProperty()         {            double[] latLong = new double[2];            GeoCoordinateWatcher watcher = new GeoCoordinateWatcher();            watcher.TryStart(false,TimeSpan.FromMilliseconds(1000));            GeoCoordinate coord = watcher.Position.Location;            if (coord.IsUnknown != true)            {                latLong[0] = coord.Latitude;                latLong[1] = coord.Longitude;            }            return latLong;        } #region 兩個經緯度之差求的距離        private const double EARTH_RADIUS = 6378.137;        private static double rad(double d)        {            return d * Math.PI / 180.0;        }        public static double GetDistance(double lat1, double lng1, double lat2, double lng2)        {            double radLat1 = rad(lat1);            double radLat2 = rad(lat2);            double a = radLat1 - radLat2;            double b = rad(lng1) - rad(lng2);            double s = 2 * Math.Asin(Math.Sqrt(Math.Pow(Math.Sin(a / 2), 2) +             Math.Cos(radLat1) * Math.Cos(radLat2) * Math.Pow(Math.Sin(b / 2), 2)));            s = s * EARTH_RADIUS;            s = Math.Round(s * 10000) / 10000;            return s;        }        #endregion//URL介面來自諾基亞地圖public static Uri Get_CityNameOnMap(double slatitude, double slongitude)         {            string urlString = "http://loc.desktop.maps.svc.ovi.com/geocoder/rgc/1.0?" + "lat=" + slatitude + "&long=" + slongitude + "&output=json";            return new Uri(urlString, UriKind.RelativeOrAbsolute);        }