c# - 为什么 e.Handled = true 不起作用？

Question

我有以下 XAML

 <StackPanel MouseEnter="StackPanel_MouseEnter" Height="130" Background="Blue">
    <Grid MouseEnter="Grid_MouseEnter" Height="60" Background="Red" >
       <Button MouseEnter="Button_MouseEnter" Height="20"/>
    </Grid>
 </StackPanel>

在后面的代码中我正在这样做

private void StackPanel_MouseEnter(object sender, MouseEventArgs e)
{

}

private void Grid_MouseEnter(object sender, MouseEventArgs e)
{
    e.Handled = true;
}

private void Button_MouseEnter(object sender, MouseEventArgs e)
{   
    e.Handled = true;
}

现在，即使我将鼠标移到 Button 上并设置 e.Handled = true，Grid 和 StackPanel< 的事件 分别被调用。为什么？我应该怎么做才能阻止路由事件冒泡？

Answer 1

MouseEnter 事件不是冒泡事件，它是直接事件(类似于经典的 CLR 事件)。来自documentation :

You can define multiple MouseEnter events for objects in XAML content. However, if a child object and its parent object both define a MouseEnter event, the parent object's MouseEnter event occurs before the child object's MouseEnter event. This is not a case of a bubbling event; it indicates only that the mouse (or stylus) has entered both objects, potentially at different times depending on the layout and the composition of the visual tree.

所以你不能阻止它被 parent 解雇。您可以使用 IsMouseDirectlyOver属性来查看鼠标实际上是否仅在给定元素上。