<ItemsControl x:Class="HDSProject.Control.CustomFont" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:local="clr-namespace:HDSProject.Control" mc:Ignorable="d" d:DesignHeight="450" d:DesignWidth="800" x:Name="itemCtrl" ItemsSource="{Binding Path=Title2, RelativeSource={RelativeSource Mode=Self}}" FontSize="20" Foreground="Teal" > <ItemsControl.ItemsPanel> <ItemsPanelTemplate> <StackPanel Orientation="Horizontal"/> </ItemsPanelTemplate> </ItemsControl.ItemsPanel> <ItemsControl.ItemTemplate> <DataTemplate> <StackPanel> <Border Margin="{Binding Path=CharacterSpacing, RelativeSource={RelativeSource Mode=FindAncestor, AncestorType=local:CustomFont}}"> <TextBlock Text="{Binding}" /> </Border> <Rectangle Height="1" Fill="Gray" Margin="0,0,0,5"> <Rectangle.Style> <Style TargetType="Rectangle"> <Setter Property="Visibility" Value="Collapsed" /> <Style.Triggers> <DataTrigger Binding="{Binding ShowUnderline, RelativeSource={RelativeSource Mode=FindAncestor, AncestorType=local:CustomFont}}" Value="True"> <Setter Property="Visibility" Value="Visible" /> </DataTrigger> </Style.Triggers> </Style> </Rectangle.Style> </Rectangle> </StackPanel> </DataTemplate> </ItemsControl.ItemTemplate> </ItemsControl>中如何让Rectangle和ItemsControl的字体颜色保持一致

你可以将Rectangle的Fill属性绑定到ItemsControl的Foreground属性上，这样就可以让Rectangle和ItemsControl的字体颜色保持一致了。

具体代码如下：

<Rectangle Height="1" Margin="0,0,0,5" Fill="{Binding Foreground, ElementName=itemCtrl}">
    <Rectangle.Style>
        <Style TargetType="Rectangle">
            <Setter Property="Visibility" Value="Collapsed" />
            <<Style.Triggers>
                <DataTrigger Binding="{Binding ShowUnderline, RelativeSource={RelativeSource Mode=FindAncestor, AncestorType=local:CustomFont}}" Value="True">
                    <Setter Property="Visibility" Value="Visible" />
                </DataTrigger>
            </Style.Triggers>
        </Style>
    </Rectangle.Style>
</Rectangle>

这里将Rectangle的Fill属性绑定到了ItemsControl的Foreground属性上，通过ElementName指定了ItemsControl的名称。然后在Style.Triggers中设置了DataTrigger，当ShowUnderline属性为True时显示Rectangle，否则隐藏。