WPF-具有自定義屬性的樣式

Question

我正在開發我的應用程序上的文檔編號檢查，並將附加的行為寫入文本框以檢查文本。 這是行為代碼：

 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;
        }
    }

這是我在ResourceDictionary上正在做的事情：

<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>

但是，這就是事情。 它說：“調用的目標拋出了異常。” 而且我無法正常工作。

難道我做錯了什么？ 提前致謝。

Answer 1

您正在嘗試設置IsCPF屬性的值，但是您已將該屬性注冊為只讀。

你需要：

1. 更改屬性的注冊：

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

2. 添加一個SetIsCPF方法：

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