C# 中使用Linq和Lambda表达式对List 进行排序

C#中List<T>排序的两种方法

 

List<Student> stu = (List<Student>)Session["StudentList"];

 

Linq表达式:

//按学号降序

List<Student> stuList = (from s instu orderby s.stuNOdescending select s).ToList<Student>();

//按学号升序

List<Student> stuList = (from s instu orderby s.stuNO  select s).ToList<Student>();

使用Lambda表达式排序: //按学号降序
单字段：List<Student> stuList= stu.OrderByDescending(s=> s.orderid).ToList<Student>();
多字段：List<Student> stuList= stu.OrderByDescending(s=> new{s.stuNO,s.stuName}).ToList<Student>();

//按学号升序
单字段：List<Student> stuList= stu.OrderBy(s=> s.stuNO).ToList<Student>();
多字段：List<Student> stuList= stu.OrderBy(s=> new{s.stuNO,s.stuName}).ToList<Student>();


多字段主次顺序排序情况，先按no排序，再按name排序
List<Student> stuList= stu.OrderBy(s=> s.stuNO).ThenBy(s=> s.stuName).ToList<Student>();

List<Student> stuList= stu.OrderBy(s=> new{ s.stuNO }).ThenBy(s=> new{s.stuName}).ToList<Student>();