リポジトリと作業単位：エンティティ無負荷外部キーの値に基づいて

Question

私は、作業パターンのリポジトリとユニットを使用していますし、

CourseInstructorエンティティ

[Serializable] 
public class CourseInstructor : AuditableEntity 
{   
    #region Primitive Properties 
    [Required(ErrorMessage = "CourseID is required.")] 
    [ForeignKey("Course")] 
    public int CourseID { get; set; } 

    [Required(ErrorMessage = "StudentID is required.")] 
    [ForeignKey("Student")] 
    public int PersonID { get; set; } 
    #endregion 

    #region Navigation Properties 

    public Course Course { get; set; } 
    public Person Student { get; set; } 
    #endregion 
} 

は、次のように私のクラスは、

人物団体

[Serializable] 
public class Person : AuditableEntity 
{ 
    #region Primitive Properties 
    [Required(ErrorMessage = "LastName is required."), StringLength(50, ErrorMessage = "LastName is too long!")] 
    public string LastName{ get; set; } 


    [Required(ErrorMessage = "FirstName is required."), StringLength(50, ErrorMessage = "FirstName is too long!")] 
    public string FirstName{ get; set; } 

    [Required(ErrorMessage = "HireDate is required.")] 
    public DateTime? HireDate{ get; set; } 

    [Required(ErrorMessage = "EnrollmentDate is required.")] 
    public DateTime? EnrollmentDate{ get; set; } 

    #endregion 

    #region Navigation Properties 

    public virtual ICollection<CourseInstructor> CourseInstructor{ get; set; } 
    //Have other navigation properties to some other entities 

    #endregion 
} 

コースエンティティ

[Serializable] 
public class Course : AuditableEntity 
{ 
    #region Primitive Properties 
    [Required(ErrorMessage = "Title is required."), StringLength(100, ErrorMessage = "Title is too long!")] 
    public string Title 
    {get;set;} 

    [Required(ErrorMessage = "Credits is required.")] 
    public int Credits 
    {get;set;} 

    [Required(ErrorMessage = "DepartmentID is required.")] 
    public int DepartmentID 
    {get;set;} 
    #endregion 

    #region Navigation Properties 
    public Department Department { get; set; } 


    public virtual ICollection<OnlineCourse> OnlineCourses 
    {get;set;} 
    public virtual ICollection<OnsiteCourse> OnsiteCourses 
    {get;set;} 
    public virtual ICollection<StudentGrade> CourseStudentGrades 
    {get;set;} 
    public virtual ICollection<CourseInstructor> CourseInstructor 
    {get;set;} 
    #endregion 
} 

CourseInstructorConfig

public class CourseInstructorConfig : MyProjectConfig<CourseInstructor> 
{ 
    public CourseInstructorConfig() 
    {  
     base.HasRequired<Course>((CourseInstructor a) => a.Course) 
      .WithMany((Course c) => c.CourseInstructor) 
      .HasForeignKey<int>((CourseInstructor d) => d.CourseID); 

     base.HasRequired<Person>((CourseInstructor w) => w.Student) 
      .WithMany((Person p) => p.CourseInstructor) 
      .HasForeignKey<int>((CourseInstructor q) => q.PersonID); 
    } 
} 

CourseConfig

public class CourseConfig : MyProjectConfig<Course> 
{ 
    public CourseConfig() 
    { 
     base.HasRequired<Department>((Course c) => c.Department) 
      .WithMany((Department d) => d.Courses) 
      .HasForeignKey<int>((Course cs) => cs.DepartmentID);    
    } 
} 

CourseInstructorManager

public class CourseInstructorManager 
{ 
    public static List<CourseInstructor> GetCourseInstructor() 
    { 
     return new CourseInstructorRepository().GetAll().ToList(); 
    } 
} 

私はCourseInstructorのデータは、私がnullとして学生のもNULL値としてコースの値を取得しています取得しようとしています。誰も私の上記のコードの問題点を教えてもらえますか？または私は修正や追加を行う必要がありますか？どのように私はそれらentititesをbrongすることができ、CO及びpが両方ともNULLで

List<CourseInstructor> c = CourseInstructorManager.GetCourseInstructor(); 
Course co = c[0].Course; 
Person p = c[0].Student;  

を地下鉄Filles。

Answer 1

遅延ロードでデータをロードする場合は、virtualキーワードを使用する必要があります。だからあなたのCourseInstructorが、このことについて

public class CourseInstructor : AuditableEntity 
{   

    #region Primitive Properties 
    [Required(ErrorMessage = "CourseID is required.")] 
    [ForeignKey("Course")] 
    public int CourseID { get; set; } 

    [Required(ErrorMessage = "StudentID is required.")] 
    [ForeignKey("Student")] 
    public int PersonID { get; set; } 
    #endregion 

    #region Navigation Properties 

    public virtual Course Course { get; set; } 
    public virtual Person Student { get; set; } 
    #endregion 
} 

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