这是XAML代码：
<maps:Map x:Name="NearbyMap"
Center="{Binding MapCenter,Mode=TwoWay}"
ZoomLevel="{Binding ZoomLevel,Mode=TwoWay}"
>
<maptk:MapExtensions.Children>
<maptk:MapItemsControl Name="StoresMapItemsControl" ItemsSource="{Binding Treks}">
<maptk:MapItemsControl.ItemTemplate>
<DataTemplate>
<maptk:pushpin x:Name="RouteDirectionspushpin" GeoCoordinate="{Binding Location}" Visibility="Visible" Content="test"/>
</DataTemplate>
</maptk:MapItemsControl.ItemTemplate>
</maptk:MapItemsControl>
<maptk:UserLocationMarker x:Name="UserLocationMarker" Visibility="Visible" GeoCoordinate="{Binding MyLocation}"/>
</maptk:MapExtensions.Children>
</maps:Map>
xmlns:maps="clr-namespace:Microsoft.Phone.Maps.Controls;assembly=Microsoft.Phone.Maps"
xmlns:maptk="clr-namespace:Microsoft.Phone.Maps.Toolkit;assembly=Microsoft.Phone.Controls.Toolkit"
pushpinModel有一个属性Location,它是一个GeoCoordinate. Treks是一个ObservableCollection< pushpinModel>.我运行此代码,只显示UserLocationMarker,这是我当前的位置.
我终于使用依赖属性使其工作.我添加了一个新类：
public static class MappushpinDependency
{
public static readonly DependencyProperty ItemsSourceProperty =
DependencyProperty.Registerattached(
"ItemsSource",typeof(IEnumerable),typeof(MappushpinDependency),new PropertyMetadata(OnpushpinPropertyChanged));
private static void OnpushpinPropertyChanged(DependencyObject d,DependencyPropertyChangedEventArgs e)
{
UIElement uie = (UIElement)d;
var pushpin = MapExtensions.GetChildren((Map)uie).OfType<MapItemsControl>().FirstOrDefault();
pushpin.ItemsSource = (IEnumerable)e.NewValue;
}
#region Getters and Setters
public static IEnumerable GetItemsSource(DependencyObject obj)
{
return (IEnumerable)obj.GetValue(ItemsSourceProperty);
}
public static void SetItemsSource(DependencyObject obj,IEnumerable value)
{
obj.SetValue(ItemsSourceProperty,value);
}
#endregion
}
在我添加的.xaml文件中
xmlns:dp="clr-namespace:Treks.App.Util.DependencyProperties"
现在.xaml文件看起来像这样：
<maps:Map x:Name="NearbyMap"
Center="{Binding MapCenter,Mode=TwoWay}"
dp:MappushpinDependency.ItemsSource="{Binding Path=Treks}"
>
<maptk:MapExtensions.Children>
<maptk:MapItemsControl Name="StoresMapItemsControl">
<maptk:MapItemsControl.ItemTemplate>
<DataTemplate>
<maptk:pushpin x:Name="pushpins" GeoCoordinate="{Binding Location}" Visibility="Visible" Content="test"/>
</DataTemplate>
</maptk:MapItemsControl.ItemTemplate>
</maptk:MapItemsControl>
<maptk:UserLocationMarker x:Name="UserLocationMarker" Visibility="Visible" GeoCoordinate="{Binding MyLocation}"/>
</maptk:MapExtensions.Children>
</maps:Map>
现在所有的图钉都被正确渲染.