entity framework code first many to many add/update/delete/select,该如何解决

entity framework code first many to many add/update/delete/select
entity framework code first many to many add/update/delete/select求实例讲解，主要是删除，不要什么级联删除，要代码实现（include）。最好是三个表以上。

                               select d).Single();

                student.Courses.Add(new Course() { Name = "Computer Science"} );
                context.SaveChanges();

                //Assert.AreEqual(0, context.Husbands.Where(x => x.Name == "A").Count());
                Assert.AreEqual(3, context.Courses.Count());
            }

            //Delete
            using (var context = new BreakAwayContext())
            {
                var student = (from s in context.Students
                               where s.Name == "Ray"
                               select s).Single();

                context.Students.Remove(student);
                context.SaveChanges();
                Assert.AreEqual(0, context.Students.Where(x => x.Name == "Ray").Count());
            }