C# (CSharp) OnOff.Invoke примеры использования

Пример #1

        protected override void OnMouseDown(MouseEventArgs mevent)
        {
            isDown = true;
            Invalidate();
            OnOff?.Invoke(this.Tag.ToString(), true);

            base.OnMouseDown(mevent);
        }

Пример #2

        protected override void OnMouseUp(MouseEventArgs mevent)
        {
            isDown = false;
            Invalidate();
            OnOff?.Invoke(this.Tag.ToString(), false);

            base.OnMouseUp(mevent);
        }