RadioButton.OnCheckedChanged(EventArgs) Method
Definition
Important
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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 -> unitProtected Overridable Sub OnCheckedChanged (e As EventArgs)Parameters
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.
