double x = 39.9081397215191;
         double y = 116.324735831984;

        /// <summary>
        /// 获取定位经纬度
         /// </summary>
        private void GetStartGeoCoordinate()
        {
            GeoCoordinateWatcher gwatcher = new GeoCoordinateWatcher(GeoPositionAccuracy.Default);
            gwatcher.PositionChanged += (sender, e) =>
            {
                x = e.Position.Location.Latitude;//纬度
                   y = e.Position.Location.Longitude;//经度
            };
            gwatcher.Start();
        }

 private void OffSetReGeoCodeLacation(double x,double y)
        {

            MRGCSearch.GPSToOffset(new double[] { y}, new double[] {x}, (mr) =>
                {
                    MPOISearch.PoiSearchByCenLngLat(mr.RGCItemList[0].LngX, mr.RGCItemList[0].LatY, "", "010", searchpoiCenLnglat);
                });

        }

centerPoiX
类型：System.Double
查询中心点经度

centerPoiY

类型：System.Double
查询中心点纬度

keywords

类型：System.String
查询关键字(必填,可以为空字符串,用户只按类型查询)

city

类型：System.String
查询关键字所在城市的区号或名称(必填),全国为total

callBack

类型：System.Action<(Of <(<\’MPOISearchResult>)>)>
回调方法
public static void PoiSearchByCenLngLat(
   double centerPoiX,
   double centerPoiY,
   string keywords,
   string city,
    Action<MPOISearchResult> callBack
)

 public void searchpoiCenLnglat(MPOISearchResult sender)
        {
            if (sender.Erro == null)
            {
                List<MOverlay> list = new List<MOverlay>();
                for (int i = 0; i < sender.POIs.Count; i++)
                {
                    MMarker mk;

                    mymap.Children.Add(mk = new MMarker()
                    {
                        LngLat = new MLngLat(sender.POIs[i].X, sender.POIs[i].Y),
                        TipFrameworkElement = new MTip() { Title = sender.POIs[i].Name, ContentText = sender.POIs[i].Address }
                       
                    });
                    list.Add(mk);
                }

                //根据覆盖物来调整视野
                mymap.SetFitview(list);
            }
            else
            {
                MessageBox.Show(sender.Erro.Message);
            }
        }