WPF - 具有自定义属性的样式

Question

我正在开发一个文档编号来检查我的应用程序，并且我将附加的行为写入文本框以检查文本。这是行为代码：

 public class CPFTextBehavior : Behavior<TextBox>
    {
        static readonly DependencyPropertyKey IsCPFPropertyKey =
            DependencyProperty.RegisterAttachedReadOnly("IsCPF", typeof(bool), typeof(CPFTextBehavior),
                new FrameworkPropertyMetadata(false));

        public static readonly DependencyProperty IsCPFProperty = IsCPFPropertyKey.DependencyProperty;

        public static bool GetIsCPF(TextBox tb)
        {
            return (bool)tb.GetValue(IsCPFProperty);
        }

        public bool IsCPF
        {
            get { return GetIsCPF(AssociatedObject); }
            private set { AssociatedObject.SetValue(IsCPFPropertyKey, value); }
        }

        protected override void OnAttached()
        {
            base.OnAttached();
            AssociatedObject.TextChanged += LocusProject.Validacao.CPF_CNPJValidation.ValidateCPF;
            AssociatedObject.PreviewTextInput += LocusProject.Validacao.CPF_CNPJValidation.ValidateCPFMask;
            DataObject.AddPastingHandler(AssociatedObject, LocusProject.Validacao.CPF_CNPJValidation.PastingCPFMask);
            AssociatedObject.PreviewKeyDown += Interactivity.PreventInsertKey;

        }

        protected override void OnDetaching()
        {
            base.OnDetaching();
            AssociatedObject.TextChanged -= LocusProject.Validacao.CPF_CNPJValidation.ValidateCPF;
            AssociatedObject.PreviewTextInput -= LocusProject.Validacao.CPF_CNPJValidation.ValidateCPFMask;
            DataObject.RemovePastingHandler(AssociatedObject, LocusProject.Validacao.CPF_CNPJValidation.PastingCPFMask);
            AssociatedObject.PreviewKeyDown -= Interactivity.PreventInsertKey;
        }
    }

这是我在 ResourceDictionary 上所做的：

<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
                xmlns:i="clr-namespace:LocusProject">

<Style TargetType="{x:Type TextBox}" x:Key="TextFields">
    <Setter Property="BorderBrush" Value="DarkBlue"/>
    <Setter Property="BorderThickness" Value="1"/>
    <Style.Triggers>
        <EventTrigger RoutedEvent="TextBox.GotFocus">
            <EventTrigger.Actions>
                <BeginStoryboard>
                    <Storyboard>
                        <ColorAnimationUsingKeyFrames BeginTime="00:00:00" Storyboard.TargetProperty="(Panel.Background).(SolidColorBrush.Color)">
                            <SplineColorKeyFrame KeyTime="00:00:00.0000000" Value="White"/>
                            <SplineColorKeyFrame KeyTime="00:00:00.3500000" Value="LightBlue"/>
                        </ColorAnimationUsingKeyFrames>
                    </Storyboard>
                </BeginStoryboard>
            </EventTrigger.Actions>
        </EventTrigger>
        <EventTrigger RoutedEvent="TextBox.LostFocus">
            <EventTrigger.Actions>
                <BeginStoryboard>
                    <Storyboard>
                        <ColorAnimationUsingKeyFrames BeginTime="00:00:00" Storyboard.TargetProperty="(Panel.Background).(SolidColorBrush.Color)">
                            <SplineColorKeyFrame KeyTime="00:00:00.0000000" Value="LightBlue"/>
                            <SplineColorKeyFrame KeyTime="00:00:00.3500000" Value="White"/>
                        </ColorAnimationUsingKeyFrames>
                    </Storyboard>
                </BeginStoryboard>
            </EventTrigger.Actions>
        </EventTrigger>
    </Style.Triggers>
</Style>

<Style TargetType="{x:Type TextBox}" x:Key="CPFField" BasedOn="{StaticResource TextFields}">
            <Setter Property="i:CPFTextBehavior.IsCPF" Value="True" />
</Style>

但事情就是这样。它说“调用目标已引发异常”。我无法让它工作。

我做错了吗？ 提前致谢。

Answer 1

您正在尝试设置 IsCPF 属性的值，但您已将该属性注册为只读。

你需要：

1. 更改财产登记：

   static readonly DependencyProperty IsCPFProperty =
       DependencyProperty.RegisterAttached("IsCPF", typeof(bool),  typeof(CPFTextBehavior), new FrameworkPropertyMetadata(false));
   

2. 添加一个 SetIsCPF 方法：

   public static bool SetIsCPF(TextBox tb, bool value)
   {
       tb.SetValue(IsCPFProperty, value);
   }