判断最后一条记录是否可见

gdv.IsRowVisible(gdv.RowCount - 1) == RowVisibleState.Visible

if (gdv.IsRowVisible(gdv.RowCount - 1) == RowVisibleState.Visible && e.Delta < 0)
{

   //已滚动到最后一条，并继续下滑

}