實體框架代碼優先：實體分割

Question

是否可以映射以下方案？

數據表

學生

+ ID：整數PK
+名稱：VARCHAR（200）

類

+ ID：整數PK
+學生ID：FK
+ CourseID：FK
+ EnrollmentDate：日期時間

課程

+ ID：整數PK
+名稱：VARCHAR（200）

我想的表來映射下面的實體。

public class Student 
{ 
    [Key] 
    public int ID {get;set;} 
    public string Name {get;set;} 
    public virtual ICollection<Class> Classes {get;set;} 
} 

public class Class 
{ 
[Key] 
public int ID {get;set;} 
public Student Student {get;set;} 
public DateTime EnrollmentDate {get;set;} 
public string Name {get;set;} // this comes from the Courses data table 
} 

Answer 1

這應該是如何建立你所需要的FK關係：

public class Student 
{ 
    [Key] 
    public int StudentId {get;set;} 
    public string Name {get;set;} 
} 

public class Class 
{ 
    [Key] 
    public int ClassId {get;set;} 
    public DateTime EnrollmentDate {get;set;} 

    //foreign keys 
    public int CourseId {get;set;} 
    public string StudentId {get;set;} 

    //virtual constraint to link to referenced tables 
    public virtual Course Course {get;set;} 
    public virtual Student Student {get;set;} 
} 

public class Course 
{ 
    [Key] 
    public int CourseId {get;set;} 
    public string CourseName {get;set;} 
}