Question

我是Wpf的新手我有一组3个单选按钮对于所有复选框，当没有单选按钮或组中的第三个单选按钮被选中时，它不可见。

我想知道是否有办法实现这一目标？我尝试内置booleanToVisibility但它不起作用。我需要使用多个数据触发器吗？谢谢！

Answer 1

你对MultiBinding是正确的。你的Xaml应该是这样的：

<Window.Resources>
    <local:MultiBoolToVisibilityConverter x:Key="MultiBoolToVisibilityConverter"/>
</Window.Resources>
<DockPanel>
    <StackPanel DockPanel.Dock="Top">
        <RadioButton Name="rb1" Content="1"/>
        <RadioButton Name="rb2" Content="2"/>
        <RadioButton Name="rb3" Content="3"/>
    </StackPanel>
    <CheckBox DockPanel.Dock="Bottom" Content="Visible when 1 or 2 is checked.">
        <CheckBox.Visibility>
            <MultiBinding Converter="{StaticResource MultiBoolToVisibilityConverter}">
                <Binding Path="IsChecked"  ElementName="rb1" />
                <Binding Path="IsChecked"  ElementName="rb2" />
                <Binding Path="IsChecked"  ElementName="rb3" />
            </MultiBinding>
        </CheckBox.Visibility>
    </CheckBox>
</DockPanel>

转换器中的MultiBoolToVisibilityConverter应该在代码后面定义，实现IMultiValueConverter

public class MultiBoolToVisibilityConverter : IMultiValueConverter
{
    public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
    {
        bool? firstRadioButtonIsChecked = values[0] as bool?;
        bool? secondRadioButtonIsChecked = values[1] as bool?;
        bool? thirdRadioButtonIsChecked = values[2] as bool?;

        //set your logic. this is just an example:
        if (firstRadioButtonIsChecked == true || secondRadioButtonIsChecked == true)
            return Visibility.Visible;
        return Visibility.Collapsed;

    } 

    public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture)
    {
        throw new NotImplementedException();
    }
}

如需进一步的问题，您可以在其他谷歌建议中看到this post on MultiBinding and IMultiValueConverter。

wpf - checkbox.isvisible是在选中其中一个单选按钮或没有选中单选按钮时

1 个答案: