LINQ-加入多个列表 [英] LINQ - joining multiple lists

问题描述

我在此处查看了101个Linq示例在该列表中我看不到任何类似内容.如果我只是在这里看不到相关示例，请链接到该示例.

I've looked at the 101 Linq Samples here but I can't see anything like this in that list. If I'm just not seeing a relevant example there, please link to it.

如果我有这3个班级:

class Student { int id; string name }
class Course { int id, string name }
class Enrolment { int studentId; int courseId; }

我将如何使用LINQ来获取学生注册的课程列表? (假设我所有三个类都有一个IList)

How would I use LINQ to get a list of courses a student is enrolled on? (assume I have an IList of all three classes)

推荐答案

怎么样:

IEnumerable<Course> FindCoursesForStudent(Student student)
{
    return from enrolment in Enrolments 
           where enrolment.studentId == student.id
           join course in Courses
              on enrolment.courseId equals course.id
           select course;
}

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