Question

我在WPF应用程序中有一个控件，我需要折叠元素未暴露的元素，所以我需要在Loaded事件上使用代码折叠它，就像这样。

Stema.Controls.NavigationPane navPane = (Stema.Controls.NavigationPane)sender;

DockPanel docPanel =(DockPanel)VisualTreeHelper.GetChild(navPane, 0);
Border border = (Border)VisualTreeHelper.GetChild(docPanel, 1);
Grid grid = (Grid)VisualTreeHelper.GetChild(border, 0);
DockPanel docPanel1 = (DockPanel)VisualTreeHelper.GetChild(grid, 4);

docPanel1.Visibility = Visibility.Collapsed;

我的问题是，有没有办法使用样式和设置器来完成此操作，如何在可视化树中找到 unamed 元素。

修改

背后的代码

private void NavPane_Loaded(object sender, RoutedEventArgs e)
        {


            Stema.Controls.NavigationPane navPane = (Stema.Controls.NavigationPane)sender;

            DockPanel docPanel =(DockPanel)VisualTreeHelper.GetChild(navPane, 0);
            Border border = (Border)VisualTreeHelper.GetChild(docPanel, 1);
            Grid grid = (Grid)VisualTreeHelper.GetChild(border, 0);
            DockPanel docPanel1 = (DockPanel)VisualTreeHelper.GetChild(grid, 4);

            docPanel1.Visibility = Visibility.Collapsed; 

        }

XAML

<s:NavigationPane Loaded="NavPane_Loaded" x:Name="navigationPane" SelectedIndex="0" LargeItems="2" Margin="2,0,0,1" IsMinimized="False" Width="200" DockPanel.Dock="Left" Background="White"  >
            <s:NavigationPaneItem Header="Reportitems"  Name="intro" >

                <ContentControl  x:Name="ActionContent" prism:RegionManager.RegionName="{x:Static inf:RegionNames.LeftNavigationRegion}" VerticalAlignment="Stretch" >


                        <ContentControl.Template>
                            <ControlTemplate TargetType="ContentControl">

                            <ContentPresenter  Content="{TemplateBinding Content}" />

                            <ControlTemplate.Triggers>
                                    <Trigger Property="HasContent" Value="false">
                                        <Setter Property="Visibility" Value="Collapsed" />
                                    </Trigger>
                                </ControlTemplate.Triggers>
                            </ControlTemplate>
                        </ContentControl.Template>
                    </ContentControl>

            </s:NavigationPaneItem>

        </s:NavigationPane>

Answer 1

我担心你必须使用视觉树帮助器（就像你现在正在使用的那样），因为你的控件是第三方控件，因此可能会因为模板覆盖而被密封。

使用setter代替代码的样式

1 个答案: