c# - WPF:验证确认密码

Question

我有 2 个密码框。我需要检查密码是否相等。我不想将此条件写入 [].xaml.cs 代码，但我想在密码不相等时将 PasswordBox 标记为红色。

我应该编写特殊的 ValidationRule、ViewModel 中的一些代码还是其他什么？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属性并设置它而不是 BorderBrush。但我不知道如何在这种情况下使用标准的 ErrorTemplate。