Question

我正在尝试将列表框的Selected Index属性作为命令参数传递给上下文菜单项，我有命令绑定工作（感谢Will @ ElementName Binding from MenuItem in ContextMenu）但是我的命令参数有问题

<UserControl>
    <ListBox ItemsSource="{Binding myItems}">
        <ListBox.Resources> <!-- The selected item is the item the mouse is over  -->
            <Style TargetType="ListBoxItem" BasedOn="{StaticResource {x:Type ListBoxItem}}">
                <Setter Property="HorizontalContentAlignment" Value="Stretch"/>
                <Style.Triggers>
                    <DataTrigger Binding="{Binding IsMouseOver,RelativeSource={RelativeSource Self}}" 
                     Value="True">
                        <Setter Property="IsSelected" Value="True" />
                    </DataTrigger>
                </Style.Triggers>
            </Style>
        </ListBox.Resources>

        <ListBox.ItemTemplate>
            <DataTemplate>
                <Button Content="Edit" Grid.Column="4" Grid.Row="0" Tag="{Binding DataContext, ElementName=ProductBacklog}">
                    <Button.ContextMenu>
                        <ContextMenu>
                            <MenuItem Header="Remove" 
                                Command="{Binding PlacementTarget.Tag.RemoveStoryClickCommand, RelativeSource={RelativeSource AncestorType=ContextMenu}}" 
                                CommandParameter="{Binding <!--I NEED TO BIND TO THE LISTBOX-->, Path=SelectedIndex}"/>
                        </ContextMenu>
                    </Button.ContextMenu>
                </Button>
            </DataTemplate>
        </ListBox.ItemTemplate>

    </ListBox>
</UserControl>

Answer 1

您可以将CommandParameter="{Binding }"设置为将该行中的当前数据项传递给您的命令

修改

注意到你的命令在ContextMenu。 ContextMenus不是WPF的默认Visual Tree的一部分，因此绑定的工作方式不同。要绑定到当前项，请使用以下命令：

<MenuItem Header="Remove" Command="{Binding PlacementTarget.Tag.RemoveStoryClickCommand, RelativeSource={RelativeSource AncestorType=ContextMenu}}" CommandParameter="{Binding PlacementTarget.DataContext, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type ContextMenu}}}" />

这将绑定DataContext对ContextMenu放置的任何控制，因此在这种情况下它将是Button.DataContext

从上下文菜单项获取父ListBox选择索引作为CommandParamater

1 个答案: