List去重与排序

最简单的方法：利用Where一句话去重

pointLst = pointLst.Where((x, i) => pointLst.FindIndex(z => z.POINT_ID == x.POINT_ID) == i).ToList(); //原理是只保留位置 i 相同的相同元素

或者判断有无重复项

var dup = cfm.fb.FLT_LEVELS.Where((x, i) => cfm.fb.FLT_LEVELS.FindIndex(z => z.SEGPOINT.ADORPNTID == x.SEGPOINT.ADORPNTID) != i).ToList();
            if (dup.Count > 0) ...

List排序需重新赋值

 segs= segs.OrderBy(c => c.SEQ).ToList();