MVVM Windows Phone 8 - 向 map 添加图钉集合

Question

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"

图钉型号 有一个属性 Location，它是一个 GeoCoordinate。 徒步旅行 是 ObservableCollection<PushPinModel> .我运行此代码，只有 用户位置标记 显示，这是我当前的位置。

Answer 1

我终于通过使用依赖属性使它工作。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 文件如下所示:

<maps:Map x:Name="NearbyMap" 
                  Center="{Binding MapCenter, Mode=TwoWay}"
                  ZoomLevel="{Binding ZoomLevel, 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>

现在所有图钉都正确呈现。