RadioButton.OnCheckedChanged(EventArgs) RadioButton.OnCheckedChanged(EventArgs) RadioButton.OnCheckedChanged(EventArgs) RadioButton.OnCheckedChanged(EventArgs) Method

Definition

Raises the CheckedChanged event.

protected:
 virtual void OnCheckedChanged(EventArgs ^ e);
protected virtual void OnCheckedChanged (EventArgs e);
abstract member OnCheckedChanged : EventArgs -> unit
override this.OnCheckedChanged : EventArgs -> unit
Protected Overridable Sub OnCheckedChanged (e As EventArgs)

Parameters

e
EventArgs EventArgs EventArgs EventArgs

An EventArgs that contains the event data.

Examples

The following code example demonstrates how the CheckAlign property can be changed at run time. The check box portion of a RadioButton is moved to the right or left of the text when the Checked value changes. This example requires that a RadioButton control has been instantiated on a form and that a reference to the System.Drawing namespace has been included.

private:
   Void radioButton1_CheckedChanged( System::Object^ sender, System::EventArgs^ e )
   {
      // Change the check box position to be opposite its current position.
      if ( radioButton1->CheckAlign == ContentAlignment::MiddleLeft )
      {
         radioButton1->CheckAlign = ContentAlignment::MiddleRight;
      }
      else
      {
         radioButton1->CheckAlign = ContentAlignment::MiddleLeft;
      }
   }
private void radioButton1_CheckedChanged(Object sender, 
                                         EventArgs e)
{
   /* Change the check box position to 
   be the opposite its current position.*/
   if (radioButton1.CheckAlign == ContentAlignment.MiddleLeft)
   {
      radioButton1.CheckAlign = ContentAlignment.MiddleRight;
   }
   else
   {
      radioButton1.CheckAlign = ContentAlignment.MiddleLeft;
   }
}

Private Sub radioButton1_CheckedChanged(sender As Object, e As EventArgs)
    ' Change the check box position to
    ' be the opposite its current position.
    If radioButton1.CheckAlign = ContentAlignment.MiddleLeft Then
        radioButton1.CheckAlign = ContentAlignment.MiddleRight
    Else
        radioButton1.CheckAlign = ContentAlignment.MiddleLeft
    End If
End Sub

Remarks

Raising an event invokes the event handler through a delegate. For more information, see Handling and Raising Events.

The OnCheckedChanged method also allows derived classes to handle the event without attaching a delegate. This is the preferred technique for handling the event in a derived class.

Notes to Inheritors

When overriding OnCheckedChanged(EventArgs) in a derived class, be sure to call the base class' OnCheckedChanged(EventArgs) method so that registered delegates receive the event.

Applies to