windows phone 7 -如何在地图的可视区域显示推针

Question

我试图在地图上显示图钉，但由于我有很多图钉，我只想在地图的可见区域内显示那些，这应该有望使地图更具响应性。

我从对数据库的查询中获得x y点的列表。这是我到目前为止的代码…

        List<Pushpin> ListofPoints = new List<Pushpin>();
        foreach (var element in query)
        {
            //Add a pin to the map
            Pushpin pushpin = new Pushpin();
            Location location = new Location();
            location.Latitude = Convert.ToDouble(element.X); 
            location.Longitude = Convert.ToDouble(element.Y); 
            pushpin.Location = location;            
            ListofPoints.Add(pushpin);
            map1.Children.Add(pushpin);
        }

        // Position map based on a collection of Pushpins points
        var x = from l in ListofPoints
                select l.Location;
        map1.SetView(LocationRect.CreateLocationRect(x));
        ListofPoints.Clear();

谁能给我的任何建议/代码如何只显示在地图的可见区域上的点?

谢谢

Answer 1

使用ViewChangeStart和ViewChangeEnd事件获得更改后的当前视图，然后查询数据集并根据需要更新显示的引脚