如何获取上下文菜单单击发生位置的父对象属性

Question

I am trying to create secondary live tiles for my application based upon the click event of a contextmenu, and I need to expose some properties of the ContextMenu's parent object but I am unsure of how to do this. Basically, I have two HubTiles on my MainPage, and each use the same ContextMenu click event. In the ContextMenu click event MenuItem_Tap , I call a method CreateLiveTile which should get properties of the HubTile where the contextmenu click occured for use in the secondary tile that will be pinned to the start screen. What I have is as follows, but I do not know how to expose the properties of the HubTile where the ContextMenu click occured

MainPage.xaml

 <ListBox Grid.Row="0" x:Name="tileList" toolkit:TiltEffect.IsTiltEnabled="True">
                <ListBox.ItemsPanel>
                    <ItemsPanelTemplate>
                        <toolkit:WrapPanel Orientation="Horizontal" />
                    </ItemsPanelTemplate>
                </ListBox.ItemsPanel>
                <ListBox.ItemTemplate>
                    <DataTemplate>
                        <toolkit:HubTile Title="{Binding Title}" Margin="3"
                                         Notification="{Binding Notification}"
                                         DisplayNotification="{Binding DisplayNotification}"
                                         Message="{Binding Message}"
                                         GroupTag="{Binding GroupTag}"
                                         Source="{Binding ImageUri}"
                                         Tap="hubTile_Tap">
                            <toolkit:ContextMenuService.ContextMenu>
                                <toolkit:ContextMenu x:Name="menu">
                                    <toolkit:MenuItem Header="pin to start" Tap="MenuItem_Tap"/>
                                </toolkit:ContextMenu>
                            </toolkit:ContextMenuService.ContextMenu>
                        </toolkit:HubTile>

                    </DataTemplate>
                </ListBox.ItemTemplate>
            </ListBox>

MainPage.xaml.cs

public MainPage()
    {
        InitializeComponent();

        CreateHubTiles();
    }

private void CreateHubTiles()
    {
        List<TileItem> tileItems = new List<TileItem>() 
        {
            new TileItem() { ImageUri = "/Images/shareStatusImage.jpg", Title = "status", /*Notification = "last shared link uri",*/ Message = Settings.statusMessage.Value, GroupTag = "TileGroup" },
            new TileItem() { ImageUri = "/Images/shareLinkImage.jpg", Title = "link", /*Notification = "last shared status message",*/ Message = "last shared link uri", GroupTag = "TileGroup" }, 
        };

        this.tileList.ItemsSource = tileItems;
    }

private void MenuItem_Tap(object sender, System.Windows.Input.GestureEventArgs e)
    {
        //How to expose which HubTile was selected and its properties?
        //HubTile tap = sender as HubTile;  //not working, sent from ContextMenu not HubTile

        //(sender as MenuItem).
        //(sender as UIElement).
        //string parent = VisualTreeHelper.GetParent((sender as DependencyObject)).ToString();

        //attempt to pass the selected HubTile instance to CreateLiveTiles method
        CreateLiveTile(tap);
    }

    private void CreateLiveTile(HubTile hubtile)
    {
        string _title = hubtile.Title.ToString();

        //var Tile = ShellTile.ActiveTiles.FirstOrDefault(x => x.NavigationUri.ToString().Contains("DefaultTitle=" + LiveTile.Title));
        var Tile = ShellTile.ActiveTiles.FirstOrDefault(x => x.NavigationUri.ToString().Contains("DefaultTitle=" + _title));

        if (Tile == null)
        {
            try
            {
                var LiveTile = new StandardTileData
                {
                    Title = hubtile.Title,
                    BackgroundImage = ((System.Windows.Media.Imaging.BitmapImage)hubtile.Source).UriSource,
                    //Count = 1,
                    BackTitle = hubtile.Title,
                    //BackBackgroundImage = new Uri("", UriKind.Relative),
                    BackContent = hubtile.Message,
                };

                ShellTile.Create(new Uri("/MainPage.xaml?DefaultTitle=" + LiveTile.Title, UriKind.Relative), LiveTile);
            }
            catch (Exception)
            {
                MessageBox.Show("This tile could not be pinned", "Warning", MessageBoxButton.OK);
            }
        }
        else
        {
            MessageBox.Show("This tile has already been pinned", "Notice", MessageBoxButton.OK);
        }
    }

Answer 1

PlacementTarget is what you looking for, if sender is MenuItem then its parent will be ContextMenu and from that you can get the PlacementTarget where this contextMenu is placed.

private void MenuItem_Tap(object sender, System.Windows.Input.GestureEventArgs e)
{
   HubTitle tap = (((sender as MenuItem).Parent as ContextMenu).PlacementTarget
                                                            as HubTitle);

   //attempt to pass the selected HubTile instance to CreateLiveTiles method
   CreateLiveTile(tap);
}