检查每个单选按钮组是否已选择/选中一个单选按钮

Question

我目前正在开发WPF应用程序。 如果用户单击一个按钮，则程序应检查是否每个组都选中了一个单选按钮。 这是XAML的摘录：

<Border Grid.Row="3" Grid.Column="1" BorderBrush="Black" BorderThickness="2" Margin="78,0,0,0" Background="LightGray">
            <WrapPanel x:Name="wrpnlElektro" Height="65" Margin="0,0,0,-12" Background="LightGray" Grid.Column="1" Grid.Row="2" Grid.RowSpan="2" VerticalAlignment="Top">
                <Label x:Name="lblElektro" Content="Elektro" FontWeight="Bold" Margin="20,15,0,15"/>
                <Label x:Name="lblElektroBauseitig" Content="bauseitig" Margin="50,15,0,15" HorizontalAlignment="Left" VerticalAlignment="Top"/>
                <RadioButton GroupName="Elektro" x:Name="rbElektroBauseitig" Margin="20,22,0,0" HorizontalAlignment="Left" VerticalAlignment="Top"/>
                <Label x:Name="lblElektroLuxhaus" Content="Luxhaus" Margin="40,15,0,15" HorizontalAlignment="Left" VerticalAlignment="Top"/>
                <RadioButton GroupName="Elektro" x:Name="rbElektroLuxhaus" Margin="20,22,0,0" HorizontalAlignment="Left" VerticalAlignment="Top"/>
            </WrapPanel>
        </Border>

        <Border Grid.Row="4" Grid.Column="1" BorderBrush="Black" BorderThickness="2" Margin="78,0,0,0" Background="LightGray">
            <WrapPanel x:Name="wrpnlSAT" Height="60" Margin="0,0,0,0" Background="LightGray" VerticalAlignment="Top">
                <Label x:Name="lblSAT" Content="SAT-Anlage" FontWeight="Bold" Margin="20,15,0,15"/>
                <Label x:Name="lblSATJa" Content="Ja" Margin="61,15,0,0" HorizontalAlignment="Left" VerticalAlignment="Top"/>
                <RadioButton GroupName="SAT" x:Name="rbSATJa" Margin="20,22,0,22"/>
                <Label x:Name="lblSATVorb" Content="Vorber." Margin="44,15,0,15" HorizontalAlignment="Left" VerticalAlignment="Top"/>
                <RadioButton GroupName="SAT" x:Name="rbSATVorb" Margin="20,22,0,22"/>
                <Label x:Name="lblSATNein" Content="Nein" Margin="40,15,0,15" HorizontalAlignment="Left" VerticalAlignment="Top"/>
                <RadioButton GroupName="SAT" x:Name="rbSATNein" Margin="20,22,0,22"/>
            </WrapPanel>
        </Border>

        <Border Grid.Row="5" Grid.Column="1" BorderBrush="Black" BorderThickness="2" Margin="78,0,0,0" Background="LightGray">
            <WrapPanel x:Name="wrpnlPV" Margin="0,0,0,-8" Background="LightGray">
                <Label x:Name="lblPV" Content="PV-Anlage" FontWeight="Bold" Margin="20,15,0,15"/>
                <Label x:Name="lblPVJa" Content="Ja" Margin="68,15,0,0" HorizontalAlignment="Left" VerticalAlignment="Top"/>
                <RadioButton GroupName="PV" x:Name="rbPVJa" Margin="20,22,0,22" HorizontalAlignment="Left" VerticalAlignment="Top"/>
                <Label x:Name="lblPVVorb" Content="Vorber." Margin="44,15,0,15" HorizontalAlignment="Left" VerticalAlignment="Top"/>
                <RadioButton GroupName="PV" x:Name="rbPVVorb" Margin="20,22,0,22" HorizontalAlignment="Left" VerticalAlignment="Top"/>
                <Label x:Name="lblPVNein" Content="Nein" Margin="40,15,0,15" HorizontalAlignment="Left" VerticalAlignment="Top"/>
                <RadioButton GroupName="PV" x:Name="rbPVNein" Margin="20,22,0,22" HorizontalAlignment="Left" VerticalAlignment="Top"/>
            </WrapPanel>
        </Border>

因此，基本上我是说：“用户，如果您没有为每个“单选按钮容器”选择一个选项，则会出现一个带有警告的MessageBox。

如何在XAML或后面的代码中执行此操作？ 如果可能的话，请给我一个代码示例，而不是指导性注释。 非常感谢你！

Answer 1

默认情况下，为每个组中的第一个RadioButton设置IsChecked=true 。 不能从UI中取消选中它，然后就不需要验证。

或者，检查每个组：

bool success = 
     (rbElektroBauseitig.IsChecked == true || rbElektroLuxhaus.IsChecked == true) &&
     (rbSATJa.IsChecked == true || rbSATVorb.IsChecked == true  || rbSATVorb.IsChecked == true) &&
     (rbPVJa.IsChecked == true || rbPVVorb.IsChecked == true  || rbPVNein.IsChecked == true);

if (!success) 
     MessageBox.Show("Dear User, you didn't make selection");

Answer 2

另外，您可以使用Linq

您将为每个容器创建一个语句。 如果返回的变量为null，则没有任何选择。 这还将返回RadioButton，包括所选项目的名称。

    var ElektroGroup = wrpnlElektro.Children.OfType<RadioButton>().FirstOrDefault(x => x.IsChecked.Value);

    if(ElektroGroup == null || ...any other group == null...)
    {
        //TODO nothing found
        return;
    }