wpf WPF在触发器中设置边框背景
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WPF set border background in trigger
提问by Artem Makarov
I need to create a trigger, that will change Border background property, when MouseEnter occurred. I did the follow:
我需要创建一个触发器，当 MouseEnter 发生时，它会改变 Border 背景属性。我做了以下事情：
<Border Width="20" Height="30" Focusable="True">
<Border.Background>
<LinearGradientBrush>
<LinearGradientBrush.GradientStops>
<GradientStop Color="Aquamarine" Offset="0"/>
</LinearGradientBrush.GradientStops>
</LinearGradientBrush>
</Border.Background>
<Border.Style>
<Style TargetType="{x:Type Border}">
<Style.Triggers>
<Trigger Property="IsMouseOver" Value="True">
<Setter Property="Background">
<Setter.Value>
<LinearGradientBrush>
<LinearGradientBrush.GradientStops>
<GradientStop Color="Aquamarine" Offset="0"/>
<GradientStop Color="Beige" Offset="0.2"/>
<GradientStop Color="Firebrick" Offset="0.5"/>
<GradientStop Color="DarkMagenta" Offset="0.9"/>
</LinearGradientBrush.GradientStops>
</LinearGradientBrush>
</Setter.Value>
</Setter>
</Trigger>
</Style.Triggers>
</Style>
</Border.Style>
</Border>
but it doesn't work. Thanks.
但它不起作用。谢谢。
回答by Josh
Common mistake. You have set the Border.Background property directly which will always override the value set by your trigger. (Locally set values have a very high precedence, style has a pretty low precedence.)
常见的错误。您已直接设置 Border.Background 属性，该属性将始终覆盖触发器设置的值。（本地设置的值具有非常高的优先级，样式具有非常低的优先级。）
Instead, you should move your "normal" background into the Style like so:
相反，您应该将“正常”背景移动到样式中，如下所示：
<Border>
<Border.Style>
<Style TargetType="Border">
<Setter Property="Background">
<Setter.Value>
<LinearGradientBrush>
<LinearGradientBrush.GradientStops>
<GradientStop Color="Aquamarine" Offset="0"/>
</LinearGradientBrush.GradientStops>
</LinearGradientBrush>
</Setter.Value>
</Setter>
<Style.Triggers>
<!-- the trigger you showed -->
</Style.Triggers>
</Style>
</Border.Style>
</Border>
