list.select

using System.Linq;
list.select的使用方法
List stulist = new List();
stulist.Add(new student(1));
stulist.Add(new student(2));
stulist.Add(new student(3));

    List<int> newlist = stulist.Select(a => a.age).ToList();
    foreach (var item in newlist)
    {
        Debug.Log(item);
    }

比如有个学生类
public class student
{
public int age;
public student(int t)
{
age = t;
}
}
其中有年龄的字段，那么就可以使用list.select 将年龄选出来组成一个新的list