How to get a checked radio button in a groupbox? [duplicate]

I have a lot of radio buttons in a groupbox. Normally I will check each radio button individually using If radiobutton1.Checked = True Then.

But I think maybe there is smart way to check which radio button being checked in a groupbox. Any idea?

Solution 1:

try this

Dim rButton As RadioButton = 
        GroupBox1.Controls
       .OfType(Of RadioButton)
       .FirstOrDefault(Function(r) r.Checked = True)

this will return the Checked RadioButton in a GroupBox

Note that this is a LINQ query, and you must have

Imports System.Linq

If you do not, your IDE/Compiler may indicate that OfType is not a member of System.Windows.Forms.Control.ControlCollection

Solution 2:

If you add them (Load event for instance) to a List you could use LINQ:

Dim checkedRadioButton as RadioButton
checkedRadioButton = 
    radioButtonList.FirstOrDefault(Function(radioButton) radioButton.Checked))

This should be OK because there is a single one checked at the most.

EDIT Even better: just query the Controls collection of the GroupBox:

Dim checkedRadioButton as RadioButton
checkedRadioButton = 
    groupBox.Controls.OfType(Of RadioButton)().FirstOrDefault(Function(radioButton) radioButton.Checked))

Be aware that this will cause problems if there are no RadioButtons in the Groupbox!