C# 不允许在列表框中取消选择/取消选择

是否有办法配置WPF

列表框

，使其无法取消选择/取消选择项目？所以总是有一个项目被选中

    <Style TargetType="{x:Type RadioButton}">
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type RadioButton}">
                    <Border 
      Name="Border"
      Padding="2"
      SnapsToDevicePixels="true">

                        <Grid
                               VerticalAlignment="Center">
                            <ContentPresenter x:Name="contentPresenter"
                                              TextBlock.FontWeight="Bold"
                                              TextBlock.Foreground="{TemplateBinding Foreground}"
                                              TextBlock.FontSize="10"
                                              HorizontalAlignment="Stretch"
                                              VerticalAlignment="Stretch" />
                        </Grid>
                    </Border>
                    <ControlTemplate.Triggers>
                        <Trigger Property="IsChecked" Value="true">
                            <Setter TargetName="Border" Property="Background"
                Value="{StaticResource SelectedBackgroundBrush}"/>
                        </Trigger>
                        <Trigger Property="IsEnabled" Value="false">
                            <Setter Property="Foreground"
                Value="{StaticResource DisabledForegroundBrush}"/>
                        </Trigger>
                    </ControlTemplate.Triggers>

                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>
    <ObjectDataProvider x:Key="WindowStyles" MethodName="GetValues"
    ObjectType="{x:Type sys:Enum}" >
        <ObjectDataProvider.MethodParameters>
            <x:Type TypeName="WindowStyle" />
        </ObjectDataProvider.MethodParameters>
    </ObjectDataProvider>
    <Style x:Key="RadioButtonList" TargetType="{x:Type ListBox}">
        <Setter Property="BorderBrush" Value="{x:Null}" />
        <Setter Property="BorderThickness" Value="0" />
        <Setter Property="ItemContainerStyle">
            <Setter.Value>
                <Style TargetType="{x:Type ListBoxItem}">
                    <Setter Property="Margin" Value="6,2" />
                    <Setter Property="Template">
                        <Setter.Value>
                            <ControlTemplate TargetType="{x:Type ListBoxItem}">
                                <Border Background="Transparent">
                                    <RadioButton Focusable="False"
                    IsHitTestVisible="False"
                    IsChecked="{TemplateBinding IsSelected}">
                                        <ContentPresenter />
                                    </RadioButton>
                                </Border>
                            </ControlTemplate>
                        </Setter.Value>
                    </Setter>
                </Style>
            </Setter.Value>
        </Setter>
    </Style>
</Window.Resources>
<Grid>

        <StackPanel Margin="10">
            <TextBlock FontWeight="Bold">WindowStyle:</TextBlock>
            <ListBox Name="WindowStyleSelector" SelectedIndex="1" Margin="10,0,0,0"
    Style="{StaticResource RadioButtonList}" Tag="Horizontal"
    ItemsSource="{Binding Source={StaticResource WindowStyles}}" />
        </StackPanel>
</Grid>

---

我的

列表框

绑定到一个

可观察集合

您可以处理

SelectionChanged

事件，并在

SelectedItem

计算结果为

null

时设置一个选择。要重新选择未选择的项目，您可以在专用字段中跟踪上次选择的项目，该字段应始终在

SelectionChanged

事件中更新

听起来更像一个。您可以自定义listbox的ItemContainerStyle，并在您的listbox中轻松实现此行为。请参见下文

    <Style TargetType="{x:Type RadioButton}">
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type RadioButton}">
                    <Border 
      Name="Border"
      Padding="2"
      SnapsToDevicePixels="true">

                        <Grid
                               VerticalAlignment="Center">
                            <ContentPresenter x:Name="contentPresenter"
                                              TextBlock.FontWeight="Bold"
                                              TextBlock.Foreground="{TemplateBinding Foreground}"
                                              TextBlock.FontSize="10"
                                              HorizontalAlignment="Stretch"
                                              VerticalAlignment="Stretch" />
                        </Grid>
                    </Border>
                    <ControlTemplate.Triggers>
                        <Trigger Property="IsChecked" Value="true">
                            <Setter TargetName="Border" Property="Background"
                Value="{StaticResource SelectedBackgroundBrush}"/>
                        </Trigger>
                        <Trigger Property="IsEnabled" Value="false">
                            <Setter Property="Foreground"
                Value="{StaticResource DisabledForegroundBrush}"/>
                        </Trigger>
                    </ControlTemplate.Triggers>

                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>
    <ObjectDataProvider x:Key="WindowStyles" MethodName="GetValues"
    ObjectType="{x:Type sys:Enum}" >
        <ObjectDataProvider.MethodParameters>
            <x:Type TypeName="WindowStyle" />
        </ObjectDataProvider.MethodParameters>
    </ObjectDataProvider>
    <Style x:Key="RadioButtonList" TargetType="{x:Type ListBox}">
        <Setter Property="BorderBrush" Value="{x:Null}" />
        <Setter Property="BorderThickness" Value="0" />
        <Setter Property="ItemContainerStyle">
            <Setter.Value>
                <Style TargetType="{x:Type ListBoxItem}">
                    <Setter Property="Margin" Value="6,2" />
                    <Setter Property="Template">
                        <Setter.Value>
                            <ControlTemplate TargetType="{x:Type ListBoxItem}">
                                <Border Background="Transparent">
                                    <RadioButton Focusable="False"
                    IsHitTestVisible="False"
                    IsChecked="{TemplateBinding IsSelected}">
                                        <ContentPresenter />
                                    </RadioButton>
                                </Border>
                            </ControlTemplate>
                        </Setter.Value>
                    </Setter>
                </Style>
            </Setter.Value>
        </Setter>
    </Style>
</Window.Resources>
<Grid>

        <StackPanel Margin="10">
            <TextBlock FontWeight="Bold">WindowStyle:</TextBlock>
            <ListBox Name="WindowStyleSelector" SelectedIndex="1" Margin="10,0,0,0"
    Style="{StaticResource RadioButtonList}" Tag="Horizontal"
    ItemsSource="{Binding Source={StaticResource WindowStyles}}" />
        </StackPanel>
</Grid>

    <Style TargetType="{x:Type RadioButton}">
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type RadioButton}">
                    <Border 
      Name="Border"
      Padding="2"
      SnapsToDevicePixels="true">

                        <Grid
                               VerticalAlignment="Center">
                            <ContentPresenter x:Name="contentPresenter"
                                              TextBlock.FontWeight="Bold"
                                              TextBlock.Foreground="{TemplateBinding Foreground}"
                                              TextBlock.FontSize="10"
                                              HorizontalAlignment="Stretch"
                                              VerticalAlignment="Stretch" />
                        </Grid>
                    </Border>
                    <ControlTemplate.Triggers>
                        <Trigger Property="IsChecked" Value="true">
                            <Setter TargetName="Border" Property="Background"
                Value="{StaticResource SelectedBackgroundBrush}"/>
                        </Trigger>
                        <Trigger Property="IsEnabled" Value="false">
                            <Setter Property="Foreground"
                Value="{StaticResource DisabledForegroundBrush}"/>
                        </Trigger>
                    </ControlTemplate.Triggers>

                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>
    <ObjectDataProvider x:Key="WindowStyles" MethodName="GetValues"
    ObjectType="{x:Type sys:Enum}" >
        <ObjectDataProvider.MethodParameters>
            <x:Type TypeName="WindowStyle" />
        </ObjectDataProvider.MethodParameters>
    </ObjectDataProvider>
    <Style x:Key="RadioButtonList" TargetType="{x:Type ListBox}">
        <Setter Property="BorderBrush" Value="{x:Null}" />
        <Setter Property="BorderThickness" Value="0" />
        <Setter Property="ItemContainerStyle">
            <Setter.Value>
                <Style TargetType="{x:Type ListBoxItem}">
                    <Setter Property="Margin" Value="6,2" />
                    <Setter Property="Template">
                        <Setter.Value>
                            <ControlTemplate TargetType="{x:Type ListBoxItem}">
                                <Border Background="Transparent">
                                    <RadioButton Focusable="False"
                    IsHitTestVisible="False"
                    IsChecked="{TemplateBinding IsSelected}">
                                        <ContentPresenter />
                                    </RadioButton>
                                </Border>
                            </ControlTemplate>
                        </Setter.Value>
                    </Setter>
                </Style>
            </Setter.Value>
        </Setter>
    </Style>
</Window.Resources>
<Grid>

        <StackPanel Margin="10">
            <TextBlock FontWeight="Bold">WindowStyle:</TextBlock>
            <ListBox Name="WindowStyleSelector" SelectedIndex="1" Margin="10,0,0,0"
    Style="{StaticResource RadioButtonList}" Tag="Horizontal"
    ItemsSource="{Binding Source={StaticResource WindowStyles}}" />
        </StackPanel>
</Grid>

窗口样式：

    <Style TargetType="{x:Type RadioButton}">
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type RadioButton}">
                    <Border 
      Name="Border"
      Padding="2"
      SnapsToDevicePixels="true">

                        <Grid
                               VerticalAlignment="Center">
                            <ContentPresenter x:Name="contentPresenter"
                                              TextBlock.FontWeight="Bold"
                                              TextBlock.Foreground="{TemplateBinding Foreground}"
                                              TextBlock.FontSize="10"
                                              HorizontalAlignment="Stretch"
                                              VerticalAlignment="Stretch" />
                        </Grid>
                    </Border>
                    <ControlTemplate.Triggers>
                        <Trigger Property="IsChecked" Value="true">
                            <Setter TargetName="Border" Property="Background"
                Value="{StaticResource SelectedBackgroundBrush}"/>
                        </Trigger>
                        <Trigger Property="IsEnabled" Value="false">
                            <Setter Property="Foreground"
                Value="{StaticResource DisabledForegroundBrush}"/>
                        </Trigger>
                    </ControlTemplate.Triggers>

                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>
    <ObjectDataProvider x:Key="WindowStyles" MethodName="GetValues"
    ObjectType="{x:Type sys:Enum}" >
        <ObjectDataProvider.MethodParameters>
            <x:Type TypeName="WindowStyle" />
        </ObjectDataProvider.MethodParameters>
    </ObjectDataProvider>
    <Style x:Key="RadioButtonList" TargetType="{x:Type ListBox}">
        <Setter Property="BorderBrush" Value="{x:Null}" />
        <Setter Property="BorderThickness" Value="0" />
        <Setter Property="ItemContainerStyle">
            <Setter.Value>
                <Style TargetType="{x:Type ListBoxItem}">
                    <Setter Property="Margin" Value="6,2" />
                    <Setter Property="Template">
                        <Setter.Value>
                            <ControlTemplate TargetType="{x:Type ListBoxItem}">
                                <Border Background="Transparent">
                                    <RadioButton Focusable="False"
                    IsHitTestVisible="False"
                    IsChecked="{TemplateBinding IsSelected}">
                                        <ContentPresenter />
                                    </RadioButton>
                                </Border>
                            </ControlTemplate>
                        </Setter.Value>
                    </Setter>
                </Style>
            </Setter.Value>
        </Setter>
    </Style>
</Window.Resources>
<Grid>

        <StackPanel Margin="10">
            <TextBlock FontWeight="Bold">WindowStyle:</TextBlock>
            <ListBox Name="WindowStyleSelector" SelectedIndex="1" Margin="10,0,0,0"
    Style="{StaticResource RadioButtonList}" Tag="Horizontal"
    ItemsSource="{Binding Source={StaticResource WindowStyles}}" />
        </StackPanel>
</Grid>

查看下面的链接了解更多信息

    <Style TargetType="{x:Type RadioButton}">
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type RadioButton}">
                    <Border 
      Name="Border"
      Padding="2"
      SnapsToDevicePixels="true">

                        <Grid
                               VerticalAlignment="Center">
                            <ContentPresenter x:Name="contentPresenter"
                                              TextBlock.FontWeight="Bold"
                                              TextBlock.Foreground="{TemplateBinding Foreground}"
                                              TextBlock.FontSize="10"
                                              HorizontalAlignment="Stretch"
                                              VerticalAlignment="Stretch" />
                        </Grid>
                    </Border>
                    <ControlTemplate.Triggers>
                        <Trigger Property="IsChecked" Value="true">
                            <Setter TargetName="Border" Property="Background"
                Value="{StaticResource SelectedBackgroundBrush}"/>
                        </Trigger>
                        <Trigger Property="IsEnabled" Value="false">
                            <Setter Property="Foreground"
                Value="{StaticResource DisabledForegroundBrush}"/>
                        </Trigger>
                    </ControlTemplate.Triggers>

                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>
    <ObjectDataProvider x:Key="WindowStyles" MethodName="GetValues"
    ObjectType="{x:Type sys:Enum}" >
        <ObjectDataProvider.MethodParameters>
            <x:Type TypeName="WindowStyle" />
        </ObjectDataProvider.MethodParameters>
    </ObjectDataProvider>
    <Style x:Key="RadioButtonList" TargetType="{x:Type ListBox}">
        <Setter Property="BorderBrush" Value="{x:Null}" />
        <Setter Property="BorderThickness" Value="0" />
        <Setter Property="ItemContainerStyle">
            <Setter.Value>
                <Style TargetType="{x:Type ListBoxItem}">
                    <Setter Property="Margin" Value="6,2" />
                    <Setter Property="Template">
                        <Setter.Value>
                            <ControlTemplate TargetType="{x:Type ListBoxItem}">
                                <Border Background="Transparent">
                                    <RadioButton Focusable="False"
                    IsHitTestVisible="False"
                    IsChecked="{TemplateBinding IsSelected}">
                                        <ContentPresenter />
                                    </RadioButton>
                                </Border>
                            </ControlTemplate>
                        </Setter.Value>
                    </Setter>
                </Style>
            </Setter.Value>
        </Setter>
    </Style>
</Window.Resources>
<Grid>

        <StackPanel Margin="10">
            <TextBlock FontWeight="Bold">WindowStyle:</TextBlock>
            <ListBox Name="WindowStyleSelector" SelectedIndex="1" Margin="10,0,0,0"
    Style="{StaticResource RadioButtonList}" Tag="Horizontal"
    ItemsSource="{Binding Source={StaticResource WindowStyles}}" />
        </StackPanel>
</Grid>

---

您可以在选择某个项目后禁用列表框。也许这不是最优雅的解决方案，但它对我有效，谢谢！在SelectionChanged中，您已删除SelectionChangedEventArgs中的项目。因此，您不需要跟踪最后选定的项目，它也适用于多选列表框。

    <Style TargetType="{x:Type RadioButton}">
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type RadioButton}">
                    <Border 
      Name="Border"
      Padding="2"
      SnapsToDevicePixels="true">

                        <Grid
                               VerticalAlignment="Center">
                            <ContentPresenter x:Name="contentPresenter"
                                              TextBlock.FontWeight="Bold"
                                              TextBlock.Foreground="{TemplateBinding Foreground}"
                                              TextBlock.FontSize="10"
                                              HorizontalAlignment="Stretch"
                                              VerticalAlignment="Stretch" />
                        </Grid>
                    </Border>
                    <ControlTemplate.Triggers>
                        <Trigger Property="IsChecked" Value="true">
                            <Setter TargetName="Border" Property="Background"
                Value="{StaticResource SelectedBackgroundBrush}"/>
                        </Trigger>
                        <Trigger Property="IsEnabled" Value="false">
                            <Setter Property="Foreground"
                Value="{StaticResource DisabledForegroundBrush}"/>
                        </Trigger>
                    </ControlTemplate.Triggers>

                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>
    <ObjectDataProvider x:Key="WindowStyles" MethodName="GetValues"
    ObjectType="{x:Type sys:Enum}" >
        <ObjectDataProvider.MethodParameters>
            <x:Type TypeName="WindowStyle" />
        </ObjectDataProvider.MethodParameters>
    </ObjectDataProvider>
    <Style x:Key="RadioButtonList" TargetType="{x:Type ListBox}">
        <Setter Property="BorderBrush" Value="{x:Null}" />
        <Setter Property="BorderThickness" Value="0" />
        <Setter Property="ItemContainerStyle">
            <Setter.Value>
                <Style TargetType="{x:Type ListBoxItem}">
                    <Setter Property="Margin" Value="6,2" />
                    <Setter Property="Template">
                        <Setter.Value>
                            <ControlTemplate TargetType="{x:Type ListBoxItem}">
                                <Border Background="Transparent">
                                    <RadioButton Focusable="False"
                    IsHitTestVisible="False"
                    IsChecked="{TemplateBinding IsSelected}">
                                        <ContentPresenter />
                                    </RadioButton>
                                </Border>
                            </ControlTemplate>
                        </Setter.Value>
                    </Setter>
                </Style>
            </Setter.Value>
        </Setter>
    </Style>
</Window.Resources>
<Grid>

        <StackPanel Margin="10">
            <TextBlock FontWeight="Bold">WindowStyle:</TextBlock>
            <ListBox Name="WindowStyleSelector" SelectedIndex="1" Margin="10,0,0,0"
    Style="{StaticResource RadioButtonList}" Tag="Horizontal"
    ItemsSource="{Binding Source={StaticResource WindowStyles}}" />
        </StackPanel>
</Grid>