为普通Object添加类似AttachedProperty的属性

    public class People
    {
        public string Name
        {
            get;
            set;
        }

        public People(string name)
        {
            Name = name;
        }

        public override string ToString()
        {
            return Name;
        }
    }
}

                <DataTemplate DataType="customAttachedProperty:People">
                    <TextBlock x:Name="TextBlock" Text="{Binding Name}"/>
                    <DataTemplate.Triggers>
                        <DataTrigger 如果IsKeyPerson为true>
                            <Setter TargetName="TextBlock" Property="Foreground" Value="Red"/>
                        </DataTrigger>
                    </DataTemplate.Triggers>
                </DataTemplate>