我有一个情况我使用WPF数据绑定和验证使用ExceptionValidationRule。

I have a situation where I am using wpf data binding and validation using the ExceptionValidationRule.

的解决方案的另一个部分invovles压扁一些面板和示出其他

Another part of the solution invovles collapsing some panels and showing others.

如果验证异常设置 - 即用户界面显示与周围的验证问题的UI元素红色边框，以及包含面板处于折叠状态，仍然显示红色边框。这显然​​不是意思是什么？是否有解决方法吗？任何人都知道这是由设计？

If a validation exception is set - i.e. the UI is showing a red border around the UI element with the validation problem, and the containing panel is collapsed, the red border is still displayed. This is clearly not meant to be? Is there a workaround for this? Anyone know if this is by design?

提供最少code例子（不是我的实际code，但复制的问题）。创建一个新的WpfApplication（我叫我的WpfDataBindingProblem）。

Minimal code example provided (not my actual code, but replicates the problem). Create a new WpfApplication (I called mine WpfDataBindingProblem).

该XAML代码窗口1如下：

The xaml for window1 is as follows:

<Window x:Class="WpfDataBindingProblem.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="Window1" Height="300" Width="300">
    <StackPanel Margin="5">

        <StackPanel Name="panel1" Visibility="Visible" Margin="5">
            <TextBox Name="DataBoundTextBox">
                <Binding Path="TextValue">
                    <Binding.ValidationRules>
                        <ExceptionValidationRule/>
                    </Binding.ValidationRules>
                </Binding>
            </TextBox>
        </StackPanel>

        <StackPanel Name="panel2" Visibility="Collapsed" Margin="5">
            <TextBlock>
                The quick brown fox jumps over the lazy dog.
            </TextBlock>
        </StackPanel>

        <Button Click="Button_Click" Margin="5">
            Toggle panels
        </Button>

    </StackPanel>
</Window>

在$ C $下WINDOW1如下：

The code for window1 is as follows:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;

namespace WpfDataBindingProblem {

    public partial class Window1 : Window {
        public Window1() {
            InitializeComponent();

            this.DataContext = new MyClass("default");
        }

        private void Button_Click(object sender, RoutedEventArgs e) {
            panel1.Visibility = panel1.Visibility == Visibility.Collapsed ?
                Visibility.Visible : Visibility.Collapsed;
            panel2.Visibility = panel2.Visibility == Visibility.Collapsed ?
                Visibility.Visible : Visibility.Collapsed;
        }
    }

    public class MyClass : INotifyPropertyChanged {

        private string mTextValue;

        public MyClass(string defaultText) {
            TextValue = defaultText;
        }

        public string TextValue {
            get {
                return mTextValue;
            }
            set {
                mTextValue = value;
                if (string.IsNullOrEmpty(mTextValue)) {
                    throw new ApplicationException("Text value cannot be empty");
                }
                OnPropertyChanged(new PropertyChangedEventArgs("TextValue"));
            }
        }

        public event PropertyChangedEventHandler PropertyChanged;

        protected virtual void OnPropertyChanged(PropertyChangedEventArgs e) {
            if (this.PropertyChanged != null) {
                this.PropertyChanged(this, e);
            }
        }
    }

}

要重现该问题，运行应用程序。删除默认从文本框和标签关闭文本 - 红色矩形显示指示验证问题。点击按钮。包含与红色矩形控制面板是隐藏的，另一个面板显示，但红色矩形仍然存在。 AARGH！

To reproduce the problem, run the application. Delete the default text from the textbox and tab off - red rectangle is shown indicating a validation problem. Click the button. Panel containing control with red rectangle is hidden and another panel is shown, but the red rectangle remains. Aargh!

所有帮助不大AP preciated。

All help much appreciated.

PS道歉长的问题称号！

PS apologies for long question title!

推荐答案

如果我没记错的话，这是一个已知的问题。我们再为模板的文本框，包括以下内容：

If I remember correctly, this is a known issue. We re-templated textbox to include the following:

<Setter Property="Validation.ErrorTemplate">
    <Setter.Value>
        <ControlTemplate>
            <ControlTemplate.Resources>
                <BooleanToVisibilityConverter x:Key="converter" />
        </ControlTemplate.Resources>
            <DockPanel LastChildFill="True">
                <Border 
                    BorderThickness="1"
                    BorderBrush="Red"
                    Visibility="{Binding ElementName=placeholder, Mode=OneWay, Path=AdornedElement.IsVisible, Converter={StaticResource converter}}">
                    <AdornedElementPlaceholder x:Name="placeholder" />
                </Border>
             </DockPanel>
         </ControlTemplate>
    </Setter.Value>
</Setter>