| name | age | sex |
| Lucy | 22 | woman |
| Lily | 23 | woman |
| Tom | 24 | man |
| Lucy | 22 | woman |
| Lily | 23 | woman |
| LiLei | 25 | man |
List<Person> list_persons = new List<Person>(new Person("Lucy",22,"woman"),new Person("Lily",23,"woman"),new Person("Tom",24,"man"),new Person("Lucy",22,"woman"),new Person("Lily",23,"woman"),new Person("LiLei",25,"man"));
如同上表中，名字（name）中重复的想要去除，使用linq进行去重的方法，使用Distinct()根本无法达到要求。那么：
var list_distinct = list_Persons.GroupBy(c => c.name).Select(c => c.First());
实际的意思是根据某一列进行分组，然后获取每一组的第一条数据，可以解决此次需求
原文：https://www.cnblogs.com/syp1Blog/p/9406727.html