小编Kar*_*arb的帖子

有人可以指出我错在哪里!

我创建了2个简单的类,具有多对多的关系.工作正常,所有表都正确填充.除非我尝试并重温任何学生课程,否则不会返回...

public partial class Student 
{

    public Student()
    {
        Courses = new HashSet<Course>();
    }

    public int StudentID { get; set; }

    [StringLength(50)] 
    [Required]
    public string FirstName { get; set;}

    [StringLength(50)]
    [Required]
    public string LastName {get; set;}

    public DateTime? Enroled {get;set;}

    public ICollection<Course> Courses { get; set; }


}

public class Course
{

    public Course()
    {
        Students = new HashSet<Student>();
    }
    public int CourseID { get; set; }

    [StringLength(30)]
    [Required]
    public string CourseTitle { get; set; }

    [StringLength(255)]
    public string …