用c#的linq对list中的list查询，排序

public class Student
{
public string No;
public string Age;
public string Sex;
public List info;
}
class Info
{
public string Id;
public string Mail;
}
想查询所有的Id，No，Age和Mail的信息，并且按照Id>No>Age排序，请问如何实现

要按照大小排序你的Id，No，Age要全部改int类型，要不字符串比较12会小于2。Select展开下再排序，示例代码如下

using System;
using System.Linq;
using System.Collections.Generic;
namespace ConsoleApp1
{
    class Program
    {
        static void Main(string[] args)
        {
            //有的Id，No，Age和Mail的信息，并且按照Id>No>Age排序，请问如何实现
            var list = new List<Student> 
            {
                new Student
                {
                    No="1",
                    Age="18",
                    Sex="男",
                    info=new List<Info>{ new Info { Id = "2", Mail = "abc@163.com" }, new Info { Id = "1", Mail = "efg@163.com" } }
                },
                new Student
                {
                    No="2",
                    Age="20",
                    Sex="女",
                    info=new List<Info>{ new Info { Id = "2", Mail = "hij@163.com" }, new Info { Id = "7", Mail = "lmn@163.com" } }
                }

            };
            var rs = from stu in list
                     from i in stu.info
                     orderby i.Id, stu.No, stu.Age
                     select new { stu.No, stu.Age, stu.Sex, i.Id, i.Mail };
            foreach (var r in rs)
                Console.WriteLine($"{r.No}\t{r.Age}\t{r.Sex}\t{r.Id}\t{r.Mail}");
                   

            Console.ReadKey();
        }


    }
    public class Student
    {
        public string No;
        public string Age;
        public string Sex;
        public List <Info> info;
    }
    public class Info
    {
        public string Id;
        public string Mail;
    }
}

楼主可以模仿这个 List stuList= stu.OrderByDescending(s=> new{s.stuNO,s.stuName}).ToList();多个字段排序