获取对C#中WPF ListBox的ScrollViewer的引用? [英] Get reference to my WPF ListBox's ScrollViewer in C#?

问题描述

我认为这应该很容易，但是我很难过.

I think this should be easy but I'm having a tough time with it.

如何在C#中获得对ListBox的scrollviewer的引用?我已经尝试了几乎所有我能想到的东西. ListBox位于WPF自定义控件中，因此我们使用Template.FindName获取对所有控件的引用.我的ListBox看起来像这样:

How can I get a reference to my ListBox's scrollviewer in C#? I've tried pretty much everything I can think of. The ListBox is in a WPF Custom Control so we use Template.FindName to get references to all our controls. My ListBox looks like this:

<ListBox x:Name="PART_SoundList" 
                                 ScrollViewer.CanContentScroll="False" 
                                 ScrollViewer.HorizontalScrollBarVisibility="Auto"  
                                 ScrollViewer.VerticalScrollBarVisibility="Hidden" Focusable="False" FocusVisualStyle="{x:Null}"
                                 HorizontalAlignment="Center" VerticalAlignment="Bottom"  BorderThickness="0" 
                                 ItemContainerStyleSelector="{StaticResource ListBoxItemAlternatingStyleSelector}"
                                 ItemsSource="{Binding}"  >

                                    <ListBox.ItemsPanel>
                                        <ItemsPanelTemplate>
                                            <WrapPanel Orientation="Vertical"  Height="850" Focusable="False" Panel.ZIndex="999"  >
                                                <WrapPanel.RenderTransform>
                                                        <TransformGroup>
                                                            <ScaleTransform CenterX="0" CenterY="0" ScaleX=".75" ScaleY=".57" />
                                                        </TransformGroup>
                                                    </WrapPanel.RenderTransform>
                                            </WrapPanel>
                                        </ItemsPanelTemplate>
                                    </ListBox.ItemsPanel>

                                    <ListBox.Template>
                                        <ControlTemplate>
                                            <ScrollViewer x:Name="Scroller" VerticalAlignment="Bottom" Focusable="False" Style="{StaticResource HorizontalScroller}"   >
                                                <ItemsPresenter SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" Focusable="False" Panel.ZIndex="999"  />
                                            </ScrollViewer>
                                        </ControlTemplate>
                                    </ListBox.Template>

                                </ListBox>

Template.FindName("Scroller"，this)作为ScrollViewer的结果为空.

Template.FindName("Scroller",this) as ScrollViewer results in null.

有什么想法吗?

推荐答案

您可能试图过早地获得对ScrollViewer的引用.尝试在已加载的事件中移动代码，并检查代码是否仍返回null:

You probably try to get a reference to the ScrollViewer too soon. Try to move your code in the loaded event and check if it still returns null:

在您的customControl/form构造函数中:

in your customControl/form constructor:

this.Loaded += MainWindow_Loaded;

void MainWindow_Loaded(object sender, RoutedEventArgs e)
{
   var x = PART_SoundList.Template.FindName("Scroller", PART_SoundList);
}

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