控件默认的是D-802行
用private void SelectRow(DataGridView datagridview, int whichrow)
        {
            foreach (DataGridViewRow tmp in datagridview.SelectedRows)
                tmp.Selected = false;
            datagridview.Rows[whichrow].Selected = true;
            datagridview.FirstDisplayedScrollingRowIndex = whichrow;
        }
给出索引选定行后如图
但是真正选中的还是D-802行  这是怎么回事