帮我为 Expander 类型的控件设置事件触发器！

Question

你好，我正在尝试做这样的事情

  allrooms = remote.GetAllRooms();
        for (int a = 0; a < allrooms.Count; a++) {
            Expander ex = new Expander();
            ex.Expanded += expander1_Expanded;
            ex.Width = 254;
            ex.Name = ("expander" + a);
            ex.VerticalAlignment = System.Windows.VerticalAlignment.Stretch;
            ex.HorizontalAlignment = System.Windows.HorizontalAlignment.Stretch;
            ex.Header = allrooms[a].nome;
            WrapPanel panel = new WrapPanel();
            panel.Opacity = 1;
            panel.Width = 254;
            for (int b = 0; b < allusers.Count; b++) {
                System.Windows.Controls.Label lbl = new System.Windows.Controls.Label();
                lbl.Content = allusers[b].nick;
                lbl.Width = 127;
                panel.Children.Add(lbl);
            }
            ex.Content = panel;
            Canvas.SetTop(ex, (30 * a));
            canvasleft.Children.Add(ex);
        }
        myTimer.Stop();

现在我的目标是将此事件触发器添加到在 xaml 或 c# 中创建的扩展器中。

    <Canvas.Triggers>
        <EventTrigger RoutedEvent="Expander.Expanded" SourceName="expander">
            <EventTrigger.Actions>
                <BeginStoryboard>
                    <Storyboard>
                        <DoubleAnimation From="0" To="1" Duration="0:0:0.25" Storyboard.TargetName="listBox" Storyboard.TargetProperty="(FrameworkElement.LayoutTransform).(ScaleTransform.ScaleY)"/>
                    </Storyboard>
                </BeginStoryboard>
            </EventTrigger.Actions>
        </EventTrigger>
    </Canvas.Triggers>

类似的东西，但有错误，我需要的是类似 x:Type Expander 的东西，用于画布中所有创建的扩展器。

有人可以帮助我吗？

Answer 1

尝试如下操作：

<Canvas.Resources>
    <Style TargetType="Expander">
        <Style.Triggers>
        <EventTrigger RoutedEvent="Expander.Expanded">
            <EventTrigger.Actions>
                <BeginStoryboard>
                    <Storyboard>
                        <DoubleAnimation From="0" To="1" Duration="0:0:0.25" Storyboard.TargetName="listBox" Storyboard.TargetProperty="(FrameworkElement.LayoutTransform).(ScaleTransform.ScaleY)"/>
                    </Storyboard>
                </BeginStoryboard>
            </EventTrigger.Actions>
        </EventTrigger>
        </Style.Triggers>
    </Style>
</Canvas.Resources>

如果放置在资源中，则由于 TargetType，样式应应用于所有 Expander。