只需为已删除的行添加一个过滤器：

Just add a filter for deleted rows as:

foreach (DataRow row in table.Rows)
{
    if(row.RowState != DataRowState.Deleted) 
    {     
       if (!currentReadingsNames.Contains(MakeKey(row["ParentID"].ToString(), row["ID"].ToString())))
            {
                row.Delete();
            }
        }
    }