C# 从多个sql表实体框架web api返回数据

我在本地存储了一个数据库，其中包含许多不同的表，所有这些表都像这样连接在一起：

public class CourseController : ApiController
{
    QubDBEntities entities = new QubDBEntities();

    public IEnumerable<Course> Get()
    {
        using (QubDBEntities entities = new QubDBEntities())
        {
            return entities.Courses.ToList();
        }
    }

    public Course Get(Guid id)
    {
        using (QubDBEntities entities = new QubDBEntities())
        {
            return entities.Courses.FirstOrDefault(e => e.Id == id);
        }
    }

    public Course Get(string day, DateTime time, int duration,string moduleRef, string moduleName, string courseRef,
        string roomRef,string roomName, string roomFloor, int roomNumber, string buildingRef, string buildingName)
    {
        //how do I join tables inside here so that I can 
        //return the courses with this view?^
    }
}

我正在尝试使用entity framework为它们创建web API，而我的控制器如下所示：

public class CourseController : ApiController
{
    QubDBEntities entities = new QubDBEntities();

    public IEnumerable<Course> Get()
    {
        using (QubDBEntities entities = new QubDBEntities())
        {
            return entities.Courses.ToList();
        }
    }

    public Course Get(Guid id)
    {
        using (QubDBEntities entities = new QubDBEntities())
        {
            return entities.Courses.FirstOrDefault(e => e.Id == id);
        }
    }

    public Course Get(string day, DateTime time, int duration,string moduleRef, string moduleName, string courseRef,
        string roomRef,string roomName, string roomFloor, int roomNumber, string buildingRef, string buildingName)
    {
        //how do I join tables inside here so that I can 
        //return the courses with this view?^
    }
}

---

如有任何帮助/建议，将不胜感激

有三种方法可以返回实体框架中联接表的结果：
1-使用

Linq

，请参阅
2-使用

包括
，请参阅

3-使用原始sql，就像使用通用函数
\u context.Database.SqlQuery（sqlString）