Question

我有以下网格：

<Grid x:Name="grd" HorizontalAlignment="Left" VerticalAlignment="Top" Width="100" Height="100" >
    <Button x:Name="but" OverridesDefaultStyle="True" Width="50" Height="50" HorizontalAlignment="Left" VerticalAlignment="Top"  >
    <Button.Template>
        <ControlTemplate TargetType="{x:Type Button}">
            <Border Name="Bd" Style="{StaticResource MatrixStyle}" HorizontalAlignment="Left" VerticalAlignment="Top" Width="50" Height="50" />

        </ControlTemplate>
    </Button.Template>
    </Button>
    <Border BorderBrush="Black" BorderThickness="1" Width="50" Height="50" HorizontalAlignment="Left" VerticalAlignment="Top"/>
    <Border BorderBrush="Black" BorderThickness="1" Width="50" Height="50" HorizontalAlignment="Right" VerticalAlignment="Top"/>
    <Border BorderBrush="Black" BorderThickness="1" Width="50" Height="50" HorizontalAlignment="Left" VerticalAlignment="Bottom"/>
    <Border BorderBrush="Black" BorderThickness="1" Width="50" Height="50" HorizontalAlignment="Right" VerticalAlignment="Bottom"/>     
    </Grid>

此父网格附加了MouseDown事件。如果我保留4个边框并删除按钮，则此事件会被触发。但如果我只保留按钮并删除其他边框，则此事件不会被触发。可能是这个问题的可能原因是什么？

Answer 1

Button处理MouseDown事件并“消耗”它（即它通过为MouseDown事件设置“e.Handled = true”来防止它进一步向上路由到它的父节点）。因此，它无法到达网格控件。

话虽如此，您可能希望处理PreviewMouseDown事件。这个在它到达Button之前首先在Grid中被触发，所以你肯定能够在Grid上处理它。

WPF中的事件触发问题

1 个答案: