//列求和 datatable.AsEnumerable().Sum(c => (ConvertEx.ToDecimal(c["列名"]))).ToString(); //list去重 strlist = strlist.Where((x, i) => strlist.FindIndex(z => z == x) == i).ToList(); //datatable某一列转list List<string>strlist= dtlist.AsEnumerable().Select(t => t.Field<string>("crm_name")).ToList(); //列反序 strlist.Reverse();