如何將屬性綁定爲false值

Question

我想將ComboBox的IsEnabled屬性綁定到複選框的IsChecked屬性，而我希望只有在複選框值爲FALSE時才能使用ComboBox。

IsEnabled="{Binding ElementName=RegexCbx, Path=IsChecked}" 

這樣做的最簡單方法是什麼？

Answer 1

使用樣式觸發：

<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> 

Answer 2

從的IValueConverter衍生應該做的伎倆類：

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 

} 

最好是在資源字典，創建轉換器的實例：

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

然後在你的視圖中，做這樣的事情，其中​​IsChecked的bool值被轉換爲t o相反的價值。不要忘記包含資源字典作爲視圖的資源。

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

Answer 3

另一種方式來做到這一點，就是用混合的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>