Question

我有2个PasswordBoxes。我需要检查密码是否相等。我不想把这个条件写入[] .xaml.cs代码，但我想在密码不相等时用红色标记PasswordBox。

我应该编写特殊的ValidationRule，ViewModel中的一些代码还是别的？谁能帮我？现在验证写在[] .xaml.cs中，但我想避免它。

Answer 1

使用：

<PasswordBox Name="tbPassword" />
<PasswordBox Name="tbPasswordConf" />
<PasswordValidator 
      Box1="{Binding ElementName=tbPassword}" 
      Box2="{Binding ElementName=tbPasswordConf}" />

代码（此代码并未涵盖所有情况）：

public class PasswordValidator : FrameworkElement
 {
  static IDictionary<PasswordBox, Brush> _passwordBoxes = new Dictionary<PasswordBox, Brush>();

  public static readonly DependencyProperty Box1Property = DependencyProperty.Register("Box1", typeof(PasswordBox), typeof(PasswordValidator), new PropertyMetadata(Box1Changed));
  public static readonly DependencyProperty Box2Property = DependencyProperty.Register("Box2", typeof(PasswordBox), typeof(PasswordValidator), new PropertyMetadata(Box2Changed));

  public PasswordBox Box1
  {
   get { return (PasswordBox)GetValue(Box1Property); }
   set { SetValue(Box1Property, value); }
  }
  public PasswordBox Box2
  {
   get { return (PasswordBox)GetValue(Box2Property); }
   set { SetValue(Box2Property, value); }
  }

  private static void Box1Changed(DependencyObject d, DependencyPropertyChangedEventArgs e)
  {
  }
  private static void Box2Changed(DependencyObject d, DependencyPropertyChangedEventArgs e)
  {
   var pv = (PasswordValidator)d;
   _passwordBoxes[pv.Box2] = pv.Box2.BorderBrush;
   pv.Box2.LostFocus += (obj, evt) =>
   {
    if (pv.Box1.Password != pv.Box2.Password)
    {
     pv.Box2.BorderBrush = new SolidColorBrush(Colors.Red);
    }
    else
    {
     pv.Box2.BorderBrush = _passwordBoxes[pv.Box2];
    }
   };
  }
 }

此外，可以使用错误样式定义依赖项属性并设置它而不是BorderBrush。但我不知道在这种情况下如何使用标准的ErrorTemplate。

Answer 2

在viewModel中创建一个readonly属性，并返回PasswordConfirmBox边框的画笔，然后将文本框绑定到属性

收到评论后编辑我没有对此进行测试，可能会出现轻微错误，但这样您可以根据转换器参数返回其他类型

 public bool PasswordValidation
    {
        get
        {
            if (textBox1.Text == textBox2.Text)
                return true;
            else
                return
                    false;
        }
    }

价值转换器：

    public class ValConverter : IValueConverter
{
    #region IValueConverter Members

    public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        if (parameter == "")
        {
            if ((value as bool?) ?? false)
                return Visibility.Hidden;
            else
                return Visibility.Visible;
        }
        else if (parameter == "")
        {
            if ((value as bool?) ?? false)
                return new SolidColorBrush(Colors.Black);
            else
                return new SolidColorBrush(Colors.Red);
        }
    }

    public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {

        if (parameter == "Visibility")
        {
            if ((System.Windows.Visibility)value == Visibility.Visible)
                return false;
            else
                return true;
        }
        else if (parameter == "Brush")
        {
            if (((SolidColorBrush)value).Color == Colors.Black)
                return true;
            else
                return false;
        }

    }

的Xaml：

<Window.Resources>
    <vis:ValConverter x:Key="valConverter"/>
</Window.Resources>
<TextBox Name="textBox1"/>
<TextBox Name="textBox2" BorderBrush="{Binding ConfirmBorder,Converter={StaticResource valConverter},ConverterParameter=Brush}" />
<TextBlock Text="Passwords Does not Match!" BorderBrush="{Binding ConfirmBorder,Converter={StaticResource valConverter},ConverterParameter=Visibility}"/>

WPF：验证确认密码

2 个答案: