1

我有一个组合框，其中包含以下项目：a1、a2、a3、a4，并且我有两个 RadioButtons r1 和 r2。这就是我想要完成的：如果用户从组合框中选择项目 a2，则 r1 的 IsChecked 属性应设置为 true。如果用户从组合框中选择项目 a3 或 a4，则 r2 的 IsChecked 属性应设置为 true。我想以声明方式完成此操作；即不使用转换器。这是我的代码，提前致谢：

<Window x:Class="BMSystem.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="Window1" Height="300" Width="300">
    <Window.Resources>
        <Style x:Key="myRadioActivator1">
            <Style.Triggers>
                <DataTrigger Binding="{Binding Path=Content, ElementName=comboBox1}" Value="R2">
                    <Setter Property="RadioButton.IsChecked" Value="True"/>
                </DataTrigger>
            </Style.Triggers>
        </Style>
        <Style x:Key="myRadioActivator2">
            <Style.Triggers>
                <DataTrigger Binding="{Binding Path=Content, ElementName=comboBox1}" Value="R3">
                    <Setter Property="RadioButton.IsChecked" Value="True"/>
                </DataTrigger>
                <DataTrigger Binding="{Binding Path=Content, ElementName=comboBox1}" Value="R4">
                    <Setter Property="RadioButton.IsChecked" Value="True"/>
                </DataTrigger>
            </Style.Triggers>
        </Style>
    </Window.Resources>
    <Grid>
        <ComboBox Height="23" HorizontalAlignment="Left" Margin="10,10,0,0" Name="comboBox1" VerticalAlignment="Top" Width="120" SelectionChanged="comboBox1_SelectionChanged">
            <ComboBoxItem>R1</ComboBoxItem>
            <ComboBoxItem>R2</ComboBoxItem>
            <ComboBoxItem>R3</ComboBoxItem>
            <ComboBoxItem>R4</ComboBoxItem>
        </ComboBox>
        <RadioButton Height="16" HorizontalAlignment="Left" Margin="10,43,0,0" Name="r1" VerticalAlignment="Top" Width="120" Style="{StaticResource myRadioActivator1}">
        </RadioButton>
        <RadioButton Height="16" HorizontalAlignment="Left" Margin="10,69,0,0" Name="r2" VerticalAlignment="Top" Width="120" Style="{StaticResource myRadioActivator2}">
        </RadioButton>
    </Grid>
</Window>
4

3 回答 3

1

我认为您在没有转换器的情况下执行此操作的目标很好，但是您完全以声明方式执行此操作的目标值得怀疑。我会在项目IsChecked的视图模型中添加一个属性ComboBox并绑定到它。在我看来，将作为该属性设置基础的决策过程放入视图中似乎混淆了关注点的分离。

于 2010-02-06T18:57:44.153 回答
0

伙计……这些都是一些奇怪的要求！

这是一种解决方案：

<Page
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"> 
  <Page.Resources> 
    <XmlDataProvider x:Key="CBOptions">
      <x:XData>
        <Data xmlns="">
          <Option Name="R1" />
          <Option Name="R2" IsR1Checked="True" />
          <Option Name="R3" IsR2Checked="True" />
          <Option Name="R4" IsR2Checked="True" />
        </Data>
      </x:XData>
    </XmlDataProvider>
    <DataTemplate x:Key="CBItemTemplate">
      <TextBlock Text="{Binding XPath=@Name}" />
    </DataTemplate>
  </Page.Resources> 
  <Grid DataContext="{Binding ElementName=comboBox1, Path=SelectedItem}"> 
    <ComboBox Height="23" HorizontalAlignment="Left" Margin="10,10,0,0" Name="comboBox1" 
        VerticalAlignment="Top" Width="120" IsSynchronizedWithCurrentItem="True"
        ItemsSource="{Binding Source={StaticResource CBOptions}, XPath=Data/Option}"
        ItemTemplate="{StaticResource CBItemTemplate}" />
    <RadioButton Height="16" HorizontalAlignment="Left" Margin="10,43,0,0" 
        Name="r1" VerticalAlignment="Top" Width="120" GroupName="R1" 
        IsChecked="{Binding XPath=@IsR1Checked}" />
    <RadioButton Height="16" HorizontalAlignment="Left" Margin="10,69,0,0" 
        Name="r2" VerticalAlignment="Top" Width="120" GroupName="R2" 
        IsChecked="{Binding XPath=@IsR2Checked}" />
  </Grid> 
</Page>
于 2010-02-06T19:15:30.127 回答
0

您可以通过将所有内容移入 aDataTemplate并在其中使用Triggers 来做到这一点。我可能会考虑 Robert 的建议，将其固定在一个ViewModel或其他绑定对象中，因为这听起来更像是业务逻辑，而不仅仅是 UI。那说：

<ContentControl Content="{Binding}">
    <ContentControl.ContentTemplate>
        <DataTemplate>
            <Grid>
                <ComboBox Height="23" HorizontalAlignment="Left" Margin="10,10,0,0" Name="comboBox1" VerticalAlignment="Top" Width="120" SelectionChanged="comboBox1_SelectionChanged"
                          SelectedValuePath="Content">
                    <ComboBoxItem>R1</ComboBoxItem>
                    <ComboBoxItem>R2</ComboBoxItem>
                    <ComboBoxItem>R3</ComboBoxItem>
                    <ComboBoxItem>R4</ComboBoxItem>
                </ComboBox>
                <RadioButton Height="16" HorizontalAlignment="Left" Margin="10,43,0,0" Name="r1" VerticalAlignment="Top" Width="120" >
                </RadioButton>
                <RadioButton Height="16" HorizontalAlignment="Left" Margin="10,69,0,0" Name="r2" VerticalAlignment="Top" Width="120" >
                </RadioButton>
            </Grid>
            <DataTemplate.Triggers>
                <Trigger SourceName="comboBox1" Property="SelectedValue" Value="R2">
                    <Setter TargetName="r1" Property="RadioButton.IsChecked" Value="True"/>
                </Trigger>
                <Trigger SourceName="comboBox1" Property="SelectedValue" Value="R3">
                    <Setter TargetName="r2" Property="RadioButton.IsChecked" Value="True"/>
                </Trigger>
                <Trigger SourceName="comboBox1" Property="SelectedValue" Value="R4">
                    <Setter TargetName="r2" Property="RadioButton.IsChecked" Value="True"/>
                </Trigger>
            </DataTemplate.Triggers>
        </DataTemplate>
    </ContentControl.ContentTemplate>
</ContentControl>
于 2010-02-06T19:42:13.617 回答