WPF - 自定义属性样式

Question

我正在开发一个文档编号检查在我的应用程序，我写了一个附加的行为文本框来检查文本。这里的行为代码：

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; 
     } 
    } 

这里是我在做我的ResourceDictionary什么：

<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> 

但这里的东西。它说“异常已被调用目标引发”。我无法实现它的工作。

我做错了什么？ 在此先感谢。

Answer 1

您试图设置IsCPF属性的值，但您已将该属性注册为只读。

您需要：

1. 更改属性的登记：

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

2. 添加SetIsCPF方法：

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