//你上面是在转LIst?

new {m.Stuendid,m.Studentname}).ToList();

------解决方案--------------------
class Student  
{  
   public int Age { get; set; }  
   public string Name { get; set; }  
public bool Sex { get; set; }  
}  
private List <Student> GetStudents()  
   {  
       List <Student> students = new List <Student> {  
           new Student{ Name="a", Age=1, Sex =true},  
           new Student{ Name="b", Age=2, Sex =false},  
       };  
       return students;  
   }  
List <Student>  tmp = GetStudents.Where(p=>p.Sex ==True);  
List<Student> studentList = GetStudents
var stu2 =from st in stulist
    select new {name = st.Name, age= st.Age}