How do I get which radio button is checked from a groupbox?

Question

I have these groupboxes:

Enter image description here

I want to run some code according to checked true state of a radio button like:

string chk = radiobutton.nme; // Name of radio button whose checked is true
switch(chk)
{
    case "Option1":
        // Some code
        break;

    case "Option2":
        // Some code
        break;

    case "Option3":
        // Some code
        break;
}

Is there any direct way so that I can only get the name of the checked radio button?

possible duplicate of [Which Radio button in the group is checked?](http://stackoverflow.com/questions/1797907/which-radio-button-in-the-group-is-checked) — Tot Zam, Aug 14 '15 at 14:20

score 40 · Accepted Answer · answered Aug 31 '13 at 10:57

40

You can find all checked RadioButtons like

var buttons = this.Controls.OfType<RadioButton>()
                           .FirstOrDefault(n => n.Checked);

Also take a look at CheckedChanged event.

Occurs when the value of the Checked property changes.

answered Aug 31 '13 at 10:57

Soner Gönül

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@Soner I tried to use this code, but it provides a error of ambiguity between ´Forms.RadioButton´ and ´Controls.RadioButton´ , what does it means? – César Amorim Aug 24 '14 at 21:24
@CésarAmorim Both `System.Windows.Controls` and `System.Windows.Forms` have `RadioButton` class. I feel like, in your project both these namepsaces are added and compiler confuses which namespace belongs on this `RadioButton` when you type it only it's name. As a solution, you can use it's full name to prevent this situation like `System.Windows.Controls.RadioButton` or `System.Windows.Forms.RadioButton`. – Soner Gönül Aug 25 '14 at 06:18
3

Had some trouble following this for Universal Windows Apps, as `Windows.UI.Xaml.Controls.Page` doesn't have `Controls` property there, so it's best to use some encapsulating WPF element, like named `StackPanel` or `Grid` and `Children` property: `rbPanel.Children.OfType().FirstOrDefault(r => r.IsCheked.Value);` (`IsChecked` is nullable, hence the `.Value`) – Ignas Vyšnia Oct 02 '15 at 10:29
Would someone be able to explain the .FirstOrDefault(n => n.Checked); line for me please? – Paul Alexander Mar 10 '17 at 09:15
@PaulAlexander `OfType` method returns `IEnumerable` which means an iterable collections of `RadioButton`'s. `FirstOrDefault` method returns the first element (or `default` if can't find any element satisfied _that_ condition) which satisfied with given condition, which is `n.Checked` (that means checked) in our case. Based on radio button structure, it can be _only_ one selected item, so this code does exactly what OP wants. For more information, check `Enumerable` class from MSDN: https://learn.microsoft.com/en-us/dotnet/api/system.linq.enumerable – Soner Gönül Sep 10 '20 at 11:55

score 10 · Answer 2 · answered Mar 21 '20 at 18:29

10

groupbox1.Controls.OfType<RadioButton>().FirstOrDefault(r => r.Checked).Name

this will get the name of checked radio button. If you want to use it later, you might store name of that by storing into variable.

Cheers

answered Mar 21 '20 at 18:29

Meet Vasani

156
1
6

score 4 · Answer 3 · edited Mar 15 '16 at 13:45

You should take some look at the CheckedChanged event to register the corresponding event handler and store the Checked radio button state in some variable. However, I would like to use LINQ here just because you have just some RadioButtons which makes the cost of looping acceptable:

var checkedRadio = new []{groupBox1, groupBox2}
                   .SelectMany(g=>g.Controls.OfType<RadioButton>()
                                            .Where(r=>r.Checked))
// Print name
foreach(var c in checkedRadio)
   System.Diagnostics.Debug.Print(c.Name);

score 0 · Answer 4 · answered Mar 12 '18 at 15:58

Rather than checking all RadioButtons, use the Validated event of the GroupBox.

private void grpBox_Validated(object sender, EventArgs e)
    {
        GroupBox g = sender as GroupBox;
        var a = from RadioButton r in g.Controls where r.Checked == true select r.Name;
        strchecked = a.First();
     }

score -1 · Answer 5 · edited Mar 15 '16 at 13:57

-1

In my opinion, it's better if you use RadioGroup instead of GroupBox. If you use radioGroup, you can always find the selected item easily like this:

radioGroup.selectedIndex;

If you design using Windows Forms, I suggest to implement RadioGroup behavior like this (please note that my code is in Java):

for (Component comp:groupBox1.components) {
    if (((RadioButton)comp).selected)
        return ((RadioButton)comp).value;
}

You can put this code block in a method to return selected radioButton value, and then you can use this value in your SWITCH part.

edited Mar 15 '16 at 13:57

Peter Mortensen

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answered Aug 31 '13 at 10:57

Masoud Sahabi

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i am using windows forms and there is no option of radio group – Amit Bisht Aug 31 '13 at 11:03

How do I get which radio button is checked from a groupbox?

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