如何在c#中动态地将图像赋予图钉

Question

我有一个场景，我希望用户在wp7应用程序中查看Bing地图中的多个图钉。我使用maplayer来制作图钉集群，但我无法在cs文件本身中向该图钉动态添加图像。顺便说一下，我还没有在xaml中使用图钉控件。我只是在循环浏览时将图钉对象添加到地图图层中。

这是我的代码：

maplayer layer = new maplayer();
watcher.start();
for (int i = 0; i < lst.count; i++)
           {                  
                    Pushpin mypin = new Pushpin();
                    watcher.Position.Location.Latitude = Convert.ToDouble(lst[i].Latitude);
                    watcher.Position.Location.Longitude=Convert.ToDouble(lst[i].Longitude);
                }

                GeoCoordinate geo = new GeoCoordinate(watcher.Position.Location.Latitude, watcher.Position.Location.Longitude);
                mypin.Location = geo;
                mypin.Background = new SolidColorBrush(Colors.Gray);
                mypin.Foreground = new SolidColorBrush(Colors.White);
                mypin.Content = "My location";
                layer.AddChild(mypin, mypin.Location);
            }
            map1.SetView(watcher.Position.Location, Status == true ? 5.0 : 3.0);
            map1.Children.Add(layer);

watcher.stop();

我还尝试过使用image brush属性为图钉提供图像源，但图钉本身是不可见的。

像这样：

ImageBrush ib = new ImageBrush();
ib.ImageSource = new System.Windows.Media.Imaging.BitmapImage(new Uri(@"Images/push.png", UriKind.Relative));
mypin.Background = ib; 

请帮我一下。我需要在不从xaml端更改/添加数据模板到pushpin的情况下完成这项工作。

Answer 1

这个问题在MSDN的"使用Pushpins"页面上有介绍。下面是给出的例子，其中图像直接添加到地图上的图层：

namespace WindowsPhoneApplication1
{
    public partial class MainPage : PhoneApplicationPage
    {
        MapLayer imageLayer;

        public MainPage()
        {
            InitializeComponent();
            //Create a layer to contain the pushpin images.
            imageLayer = new MapLayer();
            map1.Children.Add(imageLayer);
        }

        private GeoCoordinate mapCenter;
        private void button1_Click(object sender, RoutedEventArgs e)
        {
            // Retrieve the center of the current map view.
            mapCenter = map1.Center;
            // Define the image to use as the pushpin icon.
            Image pinImage = new Image();
            //Define the URI location of the image.
            pinImage.Source = new System.Windows.Media.Imaging.BitmapImage(new Uri("bluepushpin.png", UriKind.Relative));
            //Define the image display properties.
            pinImage.Opacity = 0.8;
            pinImage.Stretch = System.Windows.Media.Stretch.None;
            // Put the image at the center of the view.
            PositionOrigin position = PositionOrigin.Center;
            imageLayer.AddChild(pinImage, mapCenter, position);
        }
    }
}