c# – 尝试添加叠加层以映射错误

newSystem.ArgumentException was unhandled by user code
HResult=-2147024809
Message=Value does not fall within the expected range.
Source=System.Windows
InnerException:

如果有人知道为什么会这样,我将非常感谢您的帮助

private void loadZoomLevel12Pics()
    {
        map1.Layers.Clear();
        MapLayer pinLayer = new MapLayer();
        // Create a new empty Pushpin
        // Beny Sur- Mer War Cemetary 
        MapOverlay pinOverlay = new MapOverlay();
        // Add the location of the Pushpin using latitude and longitude.
        pinOverlay.GeoCoordinate = new GeoCoordinate(49.33783000,-0.45215600);
        //Image pinOverlayImage = new Image();
        pinOverlayImage.Source = new BitmapImage(new Uri("images/Hedgehog.png",UriKind.Relative));
        pinOverlay.Content = pinOverlayImage;
        pinOverlay.PositionOrigin = new Point(0.0,0.0);
        pinOverlayImage.Opacity = 0.8;
        pinOverlayImage.Height = 8;
        pinOverlayImage.Width = 8;
        pinOverlayImage.Tap += pinOverlayImage_Tap;
        pinLayer.Add(pinOverlay);
        map1.Layers.Add(pinLayer);

然后清除这些图片并加载新的缩放级别

private void loadZoomLevel13Pics()
    {
        map1.Layers.Clear();
        MapLayer pinLayer = new MapLayer();
        // Create a new empty Pushpin
        // Beny Sur- Mer War Cemetary 
        MapOverlay pinOverlay = new MapOverlay();
        // Add the location of the Pushpin using latitude and longitude.
        pinOverlay.GeoCoordinate = new GeoCoordinate(49.33783000,0.0);
        pinOverlayImage.Opacity = 0.8;
        pinOverlayImage.Height = 30;
        pinOverlayImage.Width = 30;
        pinOverlayImage.Tap += pinOverlayImage_Tap;
        pinLayer.Add(pinOverlay);
        map1.Layers.Add(pinLayer); // THIS IS THE LINE CAUSING THE PROBLEM

所有图像都是全局声明的,因为它们用在程序内的其他函数/方法中.

看起来它试图添加之前添加的同一层并且很难这样做,但是在方法的第一行清除了所有层.