确定执行上下文菜单时在列表框中单击了哪个listboxitem

Question

我正在尝试使用列表框中的上下文菜单来运行一些come.code，这些代码需要它来自哪个项目的数据。单击事件上下文菜单项目显示msg，但我发现它不访问原始listview项目。

<Canvas x:Name="LeftCanvas"  Grid.Column="0" Grid.Row="1" Margin="5,0,0,0">
    <StackPanel>
        <TextBlock Text="Unseated Guests" Background="Blue" Foreground="White" FontFamily="Verdana" FontSize="11" FontWeight="Bold" Height="17" Width="150" HorizontalAlignment="Left" TextAlignment="Center"  Padding="0,4,5,2"></TextBlock>
        <ListBox x:Name="UnseatedPersons" ItemsSource="{Binding}" Height="218"  Width="150" BorderBrush="Blue" BorderThickness="2" HorizontalAlignment="Left" Padding="3,2,2,2" src:FloorPlanClass.DragEnabled="true" MouseEnter="UnseatedPersons_MouseEnter"
             MouseLeave="SourceListBox_MouseLeave">
            <ListBox.ItemTemplate>
                <DataTemplate>
                        <DockPanel>
                            <DockPanel.ContextMenu>
                                <ContextMenu>
                                    <MenuItem Header="Archive Info" Click="bt_click" />
                                    <MenuItem Header="Guest Info" />
                                </ContextMenu>
                            </DockPanel.ContextMenu>
                            <Image Name="imgPerson" Source="{Binding ImagePath}" />
                            <TextBlock Name="txtPersonName" Text="{Binding PersonName}" Padding="2,4,0,0" />
                        </DockPanel>
                    </DataTemplate>
            </ListBox.ItemTemplate>
        </ListBox>
    </StackPanel>            
</Canvas>

C＃：

void bt_click(object sender, RoutedEventArgs e)
{
    MessageBox.Show("my message");
}

Answer 1

通过将发送方强制转换为MenuItem来使用发送方。 喜欢：

void bt_click(object sender, RoutedEventArgs e) 
{ 
    MenuItem originalItem = (MenuItem)sender;
    MessageBox.Show(string.Format("clicked from \"{0}\"", originalItem.Name)); 
}

Answer 2

1. click事件中的发送者将是您单击的MenuItem 。
2. 它的父级将是ContextMenu
3. ContextMenu的PlacementTarget将是DockPanel 。
4. DockPanel将在可视树中将ListBoxItem作为祖先

因此，要在click事件中获取ListBoxItem ，您可以使用与此类似的内容

private void bt_click(object sender, RoutedEventArgs e)
{
    MenuItem clickedMenuItem = sender as MenuItem;
    ContextMenu contextMenu = clickedMenuItem.Parent as ContextMenu;
    DockPanel dockPanel = contextMenu.PlacementTarget as DockPanel;
    ListBoxItem listBoxItem = GetVisualParent<ListBoxItem>(dockPanel);
    MessageBox.Show(listBoxItem.ToString());

    // Update. To display the content of the ListBoxItem
    MessageBox.Show(listBoxItem.Content.ToString());
}

public static T GetVisualParent<T>(object childObject) where T : Visual
{
    DependencyObject child = childObject as DependencyObject;
    // iteratively traverse the visual tree
    while ((child != null) && !(child is T))
    {
        child = VisualTreeHelper.GetParent(child);
    }
    return child as T;
}