触发设置 wpf 文本框边框不工作

问题描述

当文本框具有焦点时，我试图在简单的文本框上设置背景边框.

Im trying to set the background borderbrush on a simple textbox when the textbox has focus.

这就是我的风格

<Style x:Key="TextBoxStyle" TargetType="TextBox">
<Style.Triggers>
 <Trigger Property="IsFocused" Value="False">
  <Setter Property="BorderBrush" Value="Blue"/>
 </Trigger>
 <Trigger Property="IsFocused" Value="True">
   <Setter Property="BorderBrush" Value="Red"/>
   <!--<Setter Property="Background" Value="Red"/>-->
 </Trigger>

IsFocus = False 可以正常工作，但是 true 的触发器却没有.

IsFocus = False works correctly however the trigger for true doesnt.

我已经注释掉了背景设置器，但如果我取消注释它，我可以看到背景设置为红色.

I have commented out the background setter but if I uncomment it I can see that the background is been set to red.

当文本框有焦点时，我需要做什么不同的事情来改变边框颜色?

What do I need to do differently to change the border colour when the textbox has focus?

谢谢.

推荐答案

如果你的 BorderThickness 为1"(默认)那么你得到的重点样式就是标准的 3D 控件之一.您可以使用 contenttemplate 重新设置控件的样式，但一个简单的(虽然不是最优雅的解决方案)是简单地将边框厚度设置为1"以外的值，就像我在下面的示例中所做的那样.

If your BorderThickness to "1" (default) then the focussed style you get is the standard 3D one of the control. You could restyle the control using a contenttemplate but a simple (although not the most elegant solution) would be to simply set the border thickness to something other than "1" as i've done in the sample below.

<TextBox Width="200" Height="25" BorderThickness="0.99">
<TextBox.Style>
    <Style  TargetType="{x:Type TextBox}">
        <Setter Property="BorderBrush" Value="Red" />
        <Style.Triggers>
            <Trigger Property="IsFocused" Value="False">
                <Setter Property="BorderBrush"  Value="Blue" />
            </Trigger>
        </Style.Triggers>
    </Style>
</TextBox.Style>

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