Bing地图控件XamlParseException

Question

我试图在Windows Phone应用程序上使用Bing地图控件，但当我启动地图控件所在的页面时，我收到以下错误：

Failed to create a 'System.Device.Location.GeoCoordinate' from the text '0,0'. [Line: 32 Position: 58]

以下是我的XAML，尽管这里没有什么特别之处：

<my:Map Height="224"
        HorizontalAlignment="Left"
        Margin="7,4,0,0"
        Name="map1"
        VerticalAlignment="Top"
        Width="443"
        Loaded="map1_Loaded"
        ViewChangeStart="map1_ViewChangeStart">
    <my:MapLayer Name="lMain">
        <Ellipse Fill="Red" Width="20" Height="20"
                 my:MapLayer.Position="0,0"
                 Name="ppLocation"
                 Visibility="Collapsed" />
    </my:MapLayer>
</my:Map>

我尝试使用以下代码添加坐标：

GeoCoordinate ld = (Application.Current as App).curentLocation;
Location ppLoc = new Location();
GeoCoordinate g = new GeoCoordinate();

ppLoc.Latitude = ld.Latitude;
ppLoc.Longitude = ld.Longitude;
ppLoc.Altitude = ld.Altitude;

map1.SetView(ppLoc, 10);

//update pushpin location and show
MapLayer.SetPosition(ppLocation, ppLoc);
ppLocation.Visibility = System.Windows.Visibility.Visible;

但它在map1.SetView(ppLoc，10)上抛出"NullReferenceExcpetion“；

Answer 1

问题出在您为Ellipse设置my:MapLayer.Position="0,0"时。要么根本不应该设置它，要么应该将它设置为有效的坐标。

此外，当您尝试设置map1.SetView(ppLoc, 10);时，您的NullReferenceExcpetion是因为map1为null。