Question

我试图将一个Command绑定到itemsControl中的嵌套ListBox，但不知怎的，我无法找到正确的DataContext来执行命令。

XAML

<UserControl DataContext="{Binding VM1, Source={StaticResource Locator}}"
  <ItemsControl  ItemsSource="{Binding SceneList}"

    <ListBox ItemsSource="{Binding PartialScenes}" 
             SelectedItem="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type ItemsControl}}, Path=DataContext.SelectedPartialScene}" >
         <ListBox.InputBindings>
              <KeyBinding Key="Delete" Command="{Binding DeleteSelectedPartialCommand}"/>
         </ListBox.InputBindings>
                <ListBox.ItemTemplate>
                    <DataTemplate>
                        <StackPanel>
                            <TextBlock>
                                  <Run Text="{Binding Path=Label}"/>
                            </TextBlock>
                        </StackPanel>
                    </DataTemplate>
                </ListBox.ItemTemplate> 
    </ListBox>
  </ItemsControl
</UserControl

VM

public class VM1
{
    public()
    {
          DeleteSelectedPartialCommand= new RelayCommand(Delete); 
    }

    public RelayCommand DeleteSelectedPartialCommand{ get; private set; }
    private void Delete()
    {
        Collection.Remove(SelectedItem);
    }
}

我已经尝试了

 Command="{Binding Path=DataContext.DeleteSelectedPartialCommand, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type ItemsControl}}}" />

 and

 Command="{Binding Path=DataContext.DeleteSelectedPartialCommand, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type ListBox}}}" />

这两个选项都不起作用。

Answer 1

您需要访问DataContext中的根UserControl。

为UserControl

添加名称

x:Name="MyUserControl"

然后为你的命令：

Command"{Binding ElementName=MyUserControl, Path=DataContext.DeleteSelectedPartialCommand}"

将命令绑定到嵌套列表框

1 个答案: