在给定内部模板元素时访问控制项

Question

我有一个TreeviewItem与style设置为此

    <Style x:Key="TreeViewItemStyle" TargetType="TreeViewItem">
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="TreeViewItem">
                        <StackPanel x:Name="stackpanel" Orientation="Horizontal">
                            <CheckBox x:Name="checkbox_treeview" Checked="treeView_AfterCheck" Unchecked="treeView_AfterCheck"/>
                            <Image x:Name="image_treeview" Width="16"/>
                            <local:WPFEditableTextBlock x:Name="label_TreeView" Text="{TemplateBinding Header}"/>
                        </StackPanel>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>

通过这样做，我能够访问模板的checkbox

TreeViewItem folderNode = new TreeViewItem();
Style style = this.FindResource("TreeViewItemStyle") as Style;
folderNode.Style = style;
ControlTemplate controlTemplate = folderNode.Template;
var templatedControl = folderNode.Template.LoadContent() as FrameworkElement;
CheckBox chbx = (CheckBox)templatedControl.FindName("checkbox_treeview");

一旦我能够访问这个checkbox我就去了checked事件处理程序。在其中，我希望能够访问包含treeViewItem的checkbox，但我无法弄清楚如何做到这一点。请帮帮我!!!

Answer 1

要从模板中定义的treeViewItem访问checkbox，您可以在xaml的Tag属性中传递它，如下所示：

 <ControlTemplate TargetType="TreeViewItem">
                    <StackPanel x:Name="stackpanel" Orientation="Horizontal">
                        <CheckBox x:Name="checkbox_treeview" Tag="{Binding RelativeSource={RelativeSource AncestorType={x:Type TreeViewItem}}}" Checked="treeView_AfterCheck" Unchecked="treeView_AfterCheck"/>
                        <Image x:Name="image_treeview" Width="16"/>
                        <local:WPFEditableTextBlock x:Name="label_TreeView" Text="{TemplateBinding Header}"/>
                    </StackPanel>
 </ControlTemplate>

以及如何从事件处理程序中检索它：

private void treeView_AfterCheck(object sender, RoutedEventArgs e)
{
     var tvi = ((sender as CheckBox).Tag as TreeViewItem);
}