LINQ笔记-介绍

var lowercaseStudentNames = from s in studentList
let lowercaseStudentName = s.StudentName.ToLower()
where lowercaseStudentName.StartsWith("r")
select lowercaseStudentName;

var teenAgerStudents = from s in studentList
where s.age > 12 && s.age < 20
select s
into teenStudents
where teenStudents.StudentName.StartsWith("B")
select teenStudents;

var list2 = teachers.SelectMany(teacher => teacher.Students);