private void HandleShapeChanged(object sender, ShapeEventArgs e)
{
Shape s = sender as Shape;
Console.WriteLine("Received event. Shape area is {0}", e.NewArea);
s.Draw();
}
protected override void OnShapeChanged(ShapeEventArgs e)
{
// circle specific processing
base.OnShapeChanged(e);
}
protected virtual void OnShapeChanged(ShapeEventArgs e)
{
var handler = ShapeChanged;
handler?.Invoke(this, e);
}
protected override void OnShapeChanged(ShapeEventArgs e)
{
// specific rectangle processing
base.OnShapeChanged(e);
}