从list 里遍历出  id="DM" 且 code="0000" 的数据

var tes1= from u in list.where u.ID == "DM" && u.Code == "0000" select u;
 
var tes2= list.Where(m => m.ID == "DM").Where(m => m.Code == "0000");
 
var tes3 = list.Where(m => m.ID == "DM" && m.Code=="0000");