.net - 根据选择的单选按钮显示控件

Question

我有一组三个单选按钮。根据选择的单选按钮，我想显示三个控件之一 - 文本框、下拉列表或按钮。如何根据选定单选按钮的结果显示控件？

Answer 1

您可以使用以下方法将控件的可见性绑定到 RadioButton 的 IsChecked 属性BooleanToVisibilityConverter：

<Page
  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
  <Page.Resources>
    <BooleanToVisibilityConverter x:Key="convVisibility"/>
  </Page.Resources>
  <Grid>
    <StackPanel Orientation="Vertical">
      <RadioButton Name="radioButton1" GroupName="group1">Control1</RadioButton>
      <RadioButton Name="radioButton2" GroupName="group1">Control2</RadioButton>
      <RadioButton Name="radioButton3" GroupName="group1">Control3</RadioButton>
      <Grid>
        <Button Visibility="{Binding IsChecked, ElementName=radioButton1, Converter={StaticResource convVisibility}}">1. Button</Button>
        <TextBlock Visibility="{Binding IsChecked, ElementName=radioButton2, Converter={StaticResource convVisibility}}">2. TextBlock</TextBlock>
        <TextBox Visibility="{Binding IsChecked, ElementName=radioButton3, Converter={StaticResource convVisibility}}">3. TextBox</TextBox>
      </Grid>
    </StackPanel>
  </Grid>
</Page>

编辑 ：

该解决方案效果很好，并且易于实施。无论如何我可以防止控件在设计模式下被隐藏？

我不了解其他设计器（例如 Blend），但在 Visual Studio 设计器中，控件永远不会隐藏......

无论如何，您可以实现自己的转换器，它总是在设计模式下返回 Visible。由于某种晦涩的原因， BooleanToVisibilityConverter 类是密封的，因此您不能从它继承。如果您不想重写转换逻辑，则可以将转换委托给 BooleanToVisibilityConverter ：

public class MyBooleanToVisibilityConverter : IValueConverter
{
    private BooleanToVisibilityConverter _converter = new BooleanToVisibilityConverter();
    private DependencyObject _dummy = new DependencyObject();

    private bool DesignMode
    {
        get
        {
            return DesignerProperties.GetIsInDesignMode(_dummy);
        }
    }

    #region IValueConverter Members

    public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        if (DesignMode)
            return Visibility.Visible;
        else
            return _converter.Convert(value, targetType, parameter, culture);
    }

    public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        return _converter.ConvertBack(value, targetType, parameter, culture);
    }

    #endregion
}

Answer 2

要在设计时保持组件可见，您可以在复选框中FallbackValue添加一个：true

<RadioButton x:Name="cbxEmail" Content="Email Details" IsEnabled="{Binding IsEmail, FallbackValue=true}" IsChecked="{Binding IsEmail, Mode=OneWay, FallbackValue=true}"
                                Grid.Column="2"/>