wpf 按钮 IsEnabled 触发器不起作用
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Button IsEnabled Trigger does not work
提问by Nick
I have a Buttonand its Style:
我有一个Button和它的风格：
<Button Name="MyBtn" Style="{StaticResource ButtonEnabledStyle}"
IsEnabled="False" Opacity="1" />
<Style x:Key="ButtonEnabledStyle" TargetType="Button">
<Style.Triggers>
<Trigger Property="IsEnabled" Value="True" >
<Setter Property="Opacity" Value="0.1" />
</Trigger>
</Style.Triggers>
</Style>
But when I enable the Button (MyBtn.IsEnabled = true) it does not change its Opacity. Why? How can I solve this problem? Thanks.
但是当我启用按钮 ( MyBtn.IsEnabled = true) 时，它不会改变它的不透明度。为什么？我怎么解决这个问题？谢谢。
回答by Julien Lebosquain
A local value set on the element (Opacity="1"in your code) will always take precedence over a style or style trigger value. Please have a look at Dependency Property Setting Precedence List.
在元素上设置的本地值（Opacity="1"在您的代码中）将始终优先于样式或样式触发器值。请查看Dependency Property Setting Precedence List。
An easy fix is to set the default value on the style instead:
一个简单的解决方法是在样式上设置默认值：
<Style x:Key="ButtonEnabledStyle" TargetType="Button">
<Setter Property="Opacity" Value="1.0" />
<Style.Triggers>
<Trigger Property="IsEnabled" Value="True" >
<Setter Property="Opacity" Value="0.1" />
</Trigger>
</Style.Triggers>
</Style>
