摘要： 想生成类似20090409001的序号。string sUsername = ""; string date = DateTime.Now.ToString("yyyyMMdd"); DataTable dtmax = Conn.query("select sUserName from xUser where sUserName like '" + date + "%' order by sUserName desc "); if (dtmax.Rows.Count == 0) sUsername = date + "001"; else sUsername =date +String .Fo 阅读全文