如何将DataTrigger应用于XAML中的自定义用户控件类

<!-- 自定义用户控件的外观和布局 -->
<UserControl x:Class="YourNamespace.YourUserControl"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:local="clr-namespace:YourNamespace">

    <Grid>
        <!-- 用户控件的其他内容 -->
        <TextBlock x:Name="displayText" Text="Hello World!" />
    </Grid>
</UserControl>

// 自定义用户控件的代码文件
using System.Windows;
using System.Windows.Controls;

namespace YourNamespace
{
    public partial class YourUserControl : UserControl
    {
        // 创建一个依赖属性，用于绑定DataTrigger所需的数据
        public static readonly DependencyProperty IsDataValidProperty =
            DependencyProperty.Register("IsDataValid", typeof(bool), typeof(YourUserControl), new PropertyMetadata(false));

        public bool IsDataValid
        {
            get { return (bool)GetValue(IsDataValidProperty); }
            set { SetValue(IsDataValidProperty, value); }
        }

        public YourUserControl()
        {
            InitializeComponent();
        }
    }
}

<!-- 自定义用户控件的样式 -->
<Style TargetType="local:YourUserControl">
    <Style.Triggers>
        <!-- 使用DataTrigger来根据依赖属性的值改变用户控件的外观 -->
        <DataTrigger Binding="{Binding IsDataValid, RelativeSource={RelativeSource Mode=Self}}" Value="True">
            <Setter TargetName="displayText" Property="Foreground" Value="Green" />
        </DataTrigger>
        <DataTrigger Binding="{Binding IsDataValid, RelativeSource={RelativeSource Mode=Self}}" Value="False">
            <Setter TargetName="displayText" Property="Foreground" Value="Red" />
        </DataTrigger>
    </Style.Triggers>
</Style>