RadioButton Group: Determine Selected Button

Question

I have several radio buttons:
...
<Grid Name="quickReportGrid">
  <RadioButton Name="radioButton1" GroupName="Calendar">Day</RadioButton>
  <RadioButton Name="radioButton4" GroupName="Calendar">Week</RadioButton>
  <RadioButton Name="radioButton2" GroupName="Calendar">Month</RadioButton>
  <RadioButton Name="radioButton5" GroupName="Calendar">Quarter</RadioButton>
  <RadioButton Name="radioButton3" GroupName="Calendar">Year</RadioButton>
  <Button Name="quickReportButton" Click="quickReportButton_Click">Quick Report</Button>
</Grid>
...
Is there a way to ask --GroupName="Calendar"-- what the selected RadioButton is?  Or do I have to poll each RadioButton until I find one which is selected?  What is the WPF elegant way to accomplish my goal?  What about a private RadioButton variable in my Window class that each RadioButton sets to --this-- in its Click event handler?

Thanks,
Dan

Answer 1

OK, I went with the event driven model using the Checked event, since Web searching revealed that the RadioButton Group is useless for getting the checked RadioButton.

- Dan

XAML:

<Grid>

    <RadioButton Name="dayButton" Checked="dayButton_Checked">Day</RadioButton>

    <RadioButton Name="weekButton" Checked="weekButton_Checked">Week</RadioButton>

    <RadioButton Name="monthButton" Checked="monthButton_Checked">Month</RadioButton>

    <RadioButton Name="quarterButton" Checked="quarterButton_Checked">Quarter</RadioButton>

    <RadioButton Name="yearButton" Checked="yearButton_Checked">Year</RadioButton>

    <Button Name="quickReportButton" Click="quickReportButton_Click">Quick Report</Button>

</Grid>

C# Code Behind:

namespace ObjectHeaderControl1

{

    /// <summary>

    /// Interaction logic for Window1.xaml

    /// </summary>

    public partial class Window1 : Window

    {

        private RadioButton quickReportCalendarCheckedRadioButton;

 

        public Window1()

        {

            InitializeComponent();

        }

 

        private void quickReportButton_Click(object sender, RoutedEventArgs e)

        {

            String calendarText;

            calendarText = (null == quickReportCalendarCheckedRadioButton)

                ? "Please select a calendar unit."

                : quickReportCalendarCheckedRadioButton.Content.ToString();

 

            MessageBox.Show(calendarText, "Quick Report");

        }

 

        private void dayButton_Checked(object sender, RoutedEventArgs e)

        {

            quickReportCalendarCheckedRadioButton = (RadioButton)sender;

        }

 

        private void weekButton_Checked(object sender, RoutedEventArgs e)

        {

            quickReportCalendarCheckedRadioButton = (RadioButton)sender;

        }

 

        private void monthButton_Checked(object sender, RoutedEventArgs e)

        {

            quickReportCalendarCheckedRadioButton = (RadioButton)sender;

        }

 

        private void quarterButton_Checked(object sender, RoutedEventArgs e)

        {

            quickReportCalendarCheckedRadioButton = (RadioButton)sender;

        }

 

        private void yearButton_Checked(object sender, RoutedEventArgs e)

        {

            quickReportCalendarCheckedRadioButton = (RadioButton)sender;

        }

     }

}

 

Answer 2

Hi danjam,

It's no necessary to add a separate event handler for each RadioButton, you can attach the same Checked event handler for all the RadioButtons, like follows:



 <RadioButton Name="radioButton1" GroupName="Calendar" Checked="radioButton_Checked ">Day</RadioButton>
 <RadioButton Name="radioButton4" GroupName="Calendar" Checked="radioButton_Checked ">Week</RadioButton>
 <RadioButton Name="radioButton2" GroupName="Calendar" Checked="radioButton_Checked ">Month</RadioButton>
.....

private void radioButton_Checked(object sender, RoutedEventArgs e)
        {
            RadioButton ck = sender as RadioButton;
            if (ck.IsChecked.Value)
                quickReportCalendarCheckedRadioButton = ck;
        }

Best Regards,
Zhi-Xin

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