实体框架代码优先：实体分割

Question

是否可以映射以下方案？

数据表

学生

+ ID：整数PK
+名称：VARCHAR（200）

类

+ ID：整数PK
+学生ID：FK
+ CourseID：FK
+ EnrollmentDate：日期时间

课程

+ ID：整数PK
+名称：VARCHAR（200）

我想的表来映射下面的实体。

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

这应该是如何建立你所需要的FK关系：

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;} 
}