如何将属性绑定到false值

3 回答

• 1

  使用样式触发器：

  <StackPanel>
      <CheckBox x:Name="Foo" Content="Click me"/>
      <ComboBox>
          <ComboBox.Style>
              <Style TargetType="{x:Type ComboBox}">
                  <Style.Triggers>
                      <DataTrigger Binding="{Binding IsChecked, ElementName=Foo}" Value="True">
                          <Setter Property="IsEnabled" Value="False"/>
                      </DataTrigger>
                  </Style.Triggers>
              </Style>
          </ComboBox.Style>
      </ComboBox>
  </StackPanel>
  

  回复于 2024-05-06T00:44:36+08:00
• 0

  从IValueConverter派生的类应该可以解决这个问题：

  public class BoolToOppositeBoolConverter : IValueConverter
  {
      #region IValueConverter Members
  
      public object Convert(object value, Type targetType, object parameter,
          System.Globalization.CultureInfo culture)
      {
          if (targetType != typeof(bool))
              throw new InvalidOperationException("The target must be a boolean");
  
          return !(bool)value;
      }
  
      public object ConvertBack(object value, Type targetType, object parameter,
          System.Globalization.CultureInfo culture)
      {
          throw new NotSupportedException();
      }
  
      #endregion
  
  }
  

  最好在资源字典中，创建转换器的实例：

  <converters:BoolToOppositeBoolConverter x:Key="oppositeBoolConverter" />
  

  然后在您的视图中，执行类似这样的操作，其中IsChecked的bool值将转换为相反的值 . 不要忘记将资源字典包含为视图的资源 .

  <TextBox IsEnabled="{Binding IsChecked, Converter={StaticResource oppositeBoolConverter}" />
  

  回复于 2024-05-06T00:44:36+08:00
• 3

  另一种方法是使用 Blend 的 DataTrigger ：

  xmlns:i="http://schemas.microsoft.com/expression/2010/interactivity"
      xmlns:ie="http://schemas.microsoft.com/expression/2010/interactions"
  
      <ComboBox>
          <i:Interaction.Triggers>
              <ie:DataTrigger Binding="{Binding IsChecked, ElementName=RegexCbx}"
                              Value="False">
                  <ie:ChangePropertyAction PropertyName="IsEnabled"
                                           TargetObject="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType=ComboBox}}"
                                           Value="True"/>
              </ie:DataTrigger>
              <ie:DataTrigger Binding="{Binding IsChecked, ElementName=RegexCbx}"
                              Value="True">
                  <ie:ChangePropertyAction PropertyName="IsEnabled"
                                           TargetObject="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType=ComboBox}}"
                                           Value="False"/>
              </ie:DataTrigger>
          </i:Interaction.Triggers>
      </ComboBox>
  

  回复于 2024-05-06T00:44:36+08:00