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世界森林论坛清单箱项目模板中的追踪活动
原标题:Trapping events within list box item templates in WPF

我使用项目模板的黄色清单箱。 在模板中定义的每个项目清单中,都有一个吨。 当用户点击纽顿时,改变数据来源的价值,确定名单的顺序。 改变数据来源并不是一个问题,因为这在我的申请模板中只是细微的。

然而,我的下一步是使用新的排序数据源重新加载列表框。我尝试从模板中执行此操作,但显然没有访问权限(或者我无法弄清楚如何访问)父元素,因此无法使用新的排序数据源重置.ItemsSource属性。

象这样的种子是可能的,但解决办法是让我ud笑:

最佳回答

您可以使用具有约束力的数据,将Button s Tag约束到ListBox ancestor。 例:

<Grid>
    <Grid.Resources>
        <DataTemplate x:Key="myDataTemplate">
            <Button Tag="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType=ListBox}}"
                        Click="Button_Click">MyButton</Button>
        </DataTemplate>
    </Grid.Resources>

    <ListBox ItemTemplate="{StaticResource myDataTemplate}" ItemsSource="..." />
</Grid>

这里的文字是:

    private void Button_Click(object sender, RoutedEventArgs e)
    {
        ListBox myListBox = (ListBox)((Button)sender).Tag;
        ...do something with myListBox...
    }

或者,你可以手工地将视觉树上攀升到你的代码上(第<条码>。

    private void Button_Click(object sender, RoutedEventArgs e)
    {
        DependencyObject search = (DependencyObject)sender;
        while (!(search is ListBox)) {
            search = VisualTreeHelper.GetParent(search);
        }
        ListBox myListBox = (ListBox)search;
        ...do something with myListBox...
    }
问题回答

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