在重新绘制地图之前，对Pushpin.Location内部ObservableCollection的更改不会影响Pushpin

Question

这里的第一个问题，到目前为止，我在阅读答案时得到了很大的帮助。不过，我找不到任何答案。所以来了..。

我们有一个必应地图，它的MapItemsControl绑定到ObservableCollection<Pushpin> Property。当向集合添加/移除项时，映射将得到正确更新。

现在我的问题是:如何更新/绑定集合中的Pushpin 的位置，以便在不通过移动/缩放？重新绘制地图的情况下将其反射到地图上。

下面是Map.xaml：

<phone:PhoneApplication ...
    DataContext="{Binding Source={StaticResource Locator}, Path=Main}">
    <maps:Map ...>
        <maps:MapItemsControl ItemsSource="{Binding MapItems}"/>
    </maps:Map>
</phone:PhoneApplication>

MainViewModel.xaml：

#region MapItems

#region MapItems Property

/// <summary>
/// The <see cref="MapItems" /> property's name.
/// </summary>
public const string MapItemsPropertyName = "MapItems";

private ObservableCollection<Pushpin> _MapItems =
    new ObservableCollection<Pushpin>();

/// <summary>
/// Sets and gets the MapItems property.
/// Changes to that property's value raise the PropertyChanged event. 
/// </summary>
public ObservableCollection<Pushpin> MapItems
{
    get
    {
        return _MapItems;
    }
    set
    {
        if (_MapItems == value)
        {
            return;
        }

        _MapItems = value;
        RaisePropertyChanged(MapItemsPropertyName);
    }
}

#endregion

#region OwnLocation

private Pushpin OwnLocation;

private void InitializeOwnLocation()
{
    OwnLocation = new Pushpin()
    {
        Style = App.Current.Resources["OwnLocationStyle"] as Style
    };
    Binding b = new Binding {
        Path = new PropertyPath("LastKnownLocation")
    };
    OwnLocation.SetBinding(Pushpin.LocationDependencyProperty, b);
    MapItems.Add(OwnLocation);
}

#endregion

...

#endregion

LastKnownLocation是在GeoCoordinateWatcher的PositionChanged中设置的

最新情况(30.5.2012 20.35)。LastKnownLocation属性的实现。

/// <summary>
/// The <see cref="LastKnownLocation" /> property's name.
/// </summary>
public const string LastKnownLocationPropertyName = "LastKnownLocation";

private GeoCoordinate _LastKnownLocation;

/// <summary>
/// Sets and gets the LastKnownLocation property.
/// Changes to that property's value raise the PropertyChanged event. 
/// </summary>
public GeoCoordinate LastKnownLocation
{
    get
    {
        return _LastKnownLocation;
    }

    private set
    {
        if (_LastKnownLocation == value)
        {
            return;
        }

        var oldValue = _LastKnownLocation;
        _LastKnownLocation = value;
        Settings["LastKnownLocation"] = _LastKnownLocation;
        RaisePropertyChanged(LastKnownLocationPropertyName, oldValue, value, true);
    }
}

Answer 1

正如我早些时候评论的那样，在谷歌搜索了很长时间后，我终于找到了一个似乎不再可用的解决办法。诀窍是在更改SetView后在地图视图上调用Pushpin.Location。

Answer 2

地图控制上的x:Name= myMap

当你想重新绑定你的图钉时

设置myMap.Children.Clear()

那就重新加你的针。

您可以通知您的数据更改