WPF-是否可以否定数据绑定表达式的结果?

您可以使用IValueConverter执行此操作:

public class NegatingConverter : IValueConverter
{
  public object Convert(object value, ...)
  {
    return !((bool)value);
  }
}

并使用其中一个作为绑定的转换器。

[ValueConversion(typeof(bool), typeof(System.Windows.Visibility))]
public class BooleanVisibilityConverter : IValueConverter
{
    System.Windows.Visibility _visibilityWhenFalse = System.Windows.Visibility.Collapsed;

    /// <summary>
    /// Gets or sets the <see cref="System.Windows.Visibility"/> value to use when the value is false. Defaults to collapsed.
    /// </summary>
    public System.Windows.Visibility VisibilityWhenFalse
    {
        get { return _visibilityWhenFalse; }
        set { _visibilityWhenFalse = value; }
    }

    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
    {
        bool negateValue;
        Boolean.TryParse(parameter as string, out negateValue);

        bool val = negateValue ^ (bool)value;  //Negate the value using XOR
        return val ? System.Windows.Visibility.Visible : _visibilityWhenFalse;
    }
    ...

此转换器将布尔转换为System.Windows.Visibility。该参数允许它在转换前对布尔求反,以防需要反向行为。您可以在如下元素中使用它:

Visibility="{Binding Path=MyBooleanProperty, Converter={StaticResource boolVisibilityConverter}, ConverterParameter=true}"

不幸的是,您不能直接对绑定表达式执行运算符,例如否定。。。我建议使用ValueConverter反转布尔值。