如何设置WPF CheckBox禁用时文本颜色为灰色？

你的问题核心是ContentPresenter没有继承CheckBox的Foreground属性，导致禁用触发器里设置的Foreground无法作用到文本上。可以通过以下方式修复：

修复步骤 #

1. 让ContentPresenter显式继承Foreground
   在你的ContentPresenter标签中添加Foreground="{TemplateBinding Foreground}"，确保文本继承CheckBox的前景色设置：

<ContentPresenter x:Name="ContentSite"
                  Margin="4,0,0,0"
                  VerticalAlignment="Center"
                  HorizontalAlignment="Left"
                  RecognizesAccessKey="True"
                  Foreground="{TemplateBinding Foreground}"/>

2. 同步灰化勾选标记
   在禁用触发器中给CheckMark也添加灰化设置，保证视觉统一：

<Trigger Property="IsEnabled" Value="false">
    <Setter TargetName="Border" Property="Background" Value="{StaticResource DisabledBackgroundBrush}" />
    <Setter TargetName="Border" Property="BorderBrush" Value="{StaticResource DisabledBorderBrush}" />
    <Setter TargetName="CheckMark" Property="Stroke" Value="{StaticResource DisabledForegroundBrush}"/>
    <Setter Property="Foreground" Value="{StaticResource DisabledForegroundBrush}"/>
</Trigger>

修改后的完整Style代码 #

<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">

<ResourceDictionary.MergedDictionaries>
    <ResourceDictionary Source="/LightZ;component/Palettes/Brushes.xaml" />
    <ResourceDictionary Source="/LightZ;component/Styles/FillBrush.xaml" />
</ResourceDictionary.MergedDictionaries>

<Style x:Key="CheckBoxFocusVisual">
    <Setter Property="Control.Template">
        <Setter.Value>
            <ControlTemplate>
                <Border>
                    <Rectangle 
        Margin="15,0,0,0"
        StrokeThickness="1"
        Stroke="#60000000"
        StrokeDashArray="1 2"/>
                </Border>
            </ControlTemplate>
        </Setter.Value>
    </Setter>
</Style>

<Style x:Key="{x:Type CheckBox}" TargetType="CheckBox">
    <Setter Property="SnapsToDevicePixels" Value="true"/>
    <Setter Property="OverridesDefaultStyle" Value="true"/>
    <Setter Property="FocusVisualStyle"    Value="{StaticResource CheckBoxFocusVisual}"/>
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="CheckBox">
                <BulletDecorator Background="Transparent">
                    <BulletDecorator.Bullet>
                        <Border x:Name="Border"  
          Width="15" 
          Height="15" 
          CornerRadius="0" 
          Background="Transparent"
          BorderThickness="1"
          BorderBrush="{StaticResource text}">
                            <Path 
            Width="12" Height="12" 
            x:Name="CheckMark"
            SnapsToDevicePixels="False" 
            Stroke="{StaticResource text}"
            StrokeThickness="2"
            Data="M 0 5 L 3 10 10 0" />
                        </Border>
                    </BulletDecorator.Bullet>
                    <ContentPresenter x:Name="ContentSite"
        Margin="4,0,0,0"
        VerticalAlignment="Center"
        HorizontalAlignment="Left"
        RecognizesAccessKey="True"
        Foreground="{TemplateBinding Foreground}"/>
                </BulletDecorator>
                <ControlTemplate.Triggers>
                    <Trigger Property="IsChecked" Value="false">
                        <Setter TargetName="CheckMark" Property="Visibility" Value="Collapsed"/>
                    </Trigger>
                    <Trigger Property="IsChecked" Value="{x:Null}">
                        <Setter TargetName="CheckMark" Property="Data" Value="M 0 7 L 7 0" />
                    </Trigger>
                    <Trigger Property="IsMouseOver" Value="true">
                        <Setter TargetName="Border" Property="Background" Value="{StaticResource highlight}" />
                        <Setter TargetName="CheckMark" Property="Stroke" Value="{StaticResource highlighttext}" />
                    </Trigger>
                    <Trigger Property="IsPressed" Value="true">
                        <Setter TargetName="Border" Property="Background" Value="{StaticResource PressedBrush}" />
                        <Setter TargetName="Border" Property="BorderBrush" Value="{StaticResource PressedBorderBrush}" />
                    </Trigger>
                    <Trigger Property="IsEnabled" Value="false">
                        <Setter TargetName="Border" Property="Background" Value="{StaticResource DisabledBackgroundBrush}" />
                        <Setter TargetName="Border" Property="BorderBrush" Value="{StaticResource DisabledBorderBrush}" />
                        <Setter TargetName="CheckMark" Property="Stroke" Value="{StaticResource DisabledForegroundBrush}"/>
                        <Setter Property="Foreground" Value="{StaticResource DisabledForegroundBrush}"/>
                    </Trigger>
                </ControlTemplate.Triggers>
            </ControlTemplate>
        </Setter.Value>
    </Setter>
</Style>
</ResourceDictionary>

内容的提问来源于stack exchange，提问作者T. J. Fan