ASP.NET中定制自己的委托和事件参数类(4)

                if (lb.CommandArgument == "ButtonPrev")
                {
                    GridPageChangedEventArgs ee = new GridPageChangedEventArgs();
                    if (this.CurrentPageIndex > 0)
                    {
                        this.CurrentPageIndex -= 1;
                        ee.CurrentPageIndex = this.CurrentPageIndex;
                        ee.PageCount = this.PageCount;
                        ee.PageSize = this.PageSize;
                        this.OnPageIndexChanged(ee);
                    }
                    handled = true;
                }

                if (lb.CommandArgument == "ButtonLast")
                {
                    GridPageChangedEventArgs ee = new GridPageChangedEventArgs();
                    if (this.CurrentPageIndex != this.PageCount - 1)