MVVM的Windows Phone 8 - 添加图钉集合到地图(MVVM Windows Pho

这里是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有一个属性的位置是一个会有地理座标。跋涉是一个ObservableCollection<PushPinModel> 我运行此代码，只有UserLocationMarker显示，这是我目前的位置。

Answer 1:

我终于使它通过使用依赖属性工作。我添加了一个新的类：

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
}

而在文件名为.xaml我已经加入

xmlns:dp="clr-namespace:Treks.App.Util.DependencyProperties"

现在的.xaml文件看起来像这样：

<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>

现在所有的图钉正确渲染。

Answer 2:

该MapItemsControl目前尚未MVVM绑定（什么我知道关闭）。所以，最好的办法是设置它ItemsSource在视图背后的代码。

您仍然可以使用您的视图模型定义虽然集合！选项包括：

通过MVVM消息从视图模型沿集合传递给代码的视图的背后
使用视图的的datacontext访问集合，是这样的： this.StoresMapItemsControl.ItemsSource = ServiceLocator.Current.GetInstance<MainViewModel>().Locations;

文章来源: MVVM Windows Phone 8 - adding a collection of pushpins to a map