非路由事件的 EventSetter？
我有一个 Label，我正在尝试使用 Trigger 更改用户是否登录的 MouseDown 事件。
<Label x:Name="lblSave" MouseDown="lblSave_MouseDown" VerticalAlignment="Center" RenderTransformOrigin="0.5,0.5" ToolTip="Save Files" Width="25" Height="25" Margin="0, 0, 5, 0" >
<Label.Style>
<Style TargetType="{x:Type Label}">
<Setter Property="Background" Value="{DynamicResource ResourceKey=saveIcon}" />
<Style.Triggers>
<DataTrigger Binding="{Binding Source={x:Static sec:Security.Instance}, Path=IsLoggedIn}" Value="False">
<Setter Property="Background" Value="{DynamicResource ResourceKey=readonlyIcon}" />
<EventSetter Event="MouseDown" Handler="lblNoAccess_MouseDown" />
</DataTrigger>
</Style.Triggers>
</Style>
</Label.Style>
但是，与这篇文章相反，我所拥有的不起作用，因为 MouseDown 不是路由事件。我仍然收到 System.Windows.EventSetter.Event 错误：{"Value can not be null.\r\nParameter name: value"}。
所以我的问题是，有没有办法使用触发器来设置非路由事件？
I have a Label that I'm trying to change the MouseDown event for if a user is logged in or not by using a Trigger.
<Label x:Name="lblSave" MouseDown="lblSave_MouseDown" VerticalAlignment="Center" RenderTransformOrigin="0.5,0.5" ToolTip="Save Files" Width="25" Height="25" Margin="0, 0, 5, 0" >
<Label.Style>
<Style TargetType="{x:Type Label}">
<Setter Property="Background" Value="{DynamicResource ResourceKey=saveIcon}" />
<Style.Triggers>
<DataTrigger Binding="{Binding Source={x:Static sec:Security.Instance}, Path=IsLoggedIn}" Value="False">
<Setter Property="Background" Value="{DynamicResource ResourceKey=readonlyIcon}" />
<EventSetter Event="MouseDown" Handler="lblNoAccess_MouseDown" />
</DataTrigger>
</Style.Triggers>
</Style>
</Label.Style>
But, contrary to this post, what I have won't work because MouseDown is not a routed event. I'm still getting the System.Windows.EventSetter.Event error: {"Value cannot be null.\r\nParameter name: value"}.
So my question is, is there a way to use a trigger to set non-routed events?
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评论（2）
就像 HB 所说的那样，您不能在 Triggers 集合中使用 EventSetter，您应该检查事件处理程序是否已记录并执行正确的代码，这个解决方案不适合您吗？
Like H.B. said you can't use EventSetter in a Triggers collection, you should check in the event handler if it is logged or not and execute the right code, doesn't this solution work for you?
来自文档：
（也如评论中所述，
MouseDown已路由。）From the documentation:
(Also as noted in the comment,
MouseDownis routed.)