我必须上课:
public class Subject
{
[Key]
public int SubjectID { get; set; }
public string SubjectName { get; set; }
public virtual ICollection<Teacher> Teachers { get; set; }
}
和
public class Teacher
{
[Key]
public int TeacherID { get; set; }
public string TeacherName { get; set; }
public virtual ICollection<Subject> Subjects { get; set; }
}
所以我在两个表之间创建了多对多关系,EF 会自动创建联结表:
学科教师:
PK 主题ID
PK教师ID
我的问题是,我如何告诉 EF 如何链接表中的值?
例子:
主题 ID = 1;主题名 = 数学;
主题 ID = 2; SubjectName = 生物学;
教师 ID = 1; 教师姓名 = 数学教师;
教师 ID = 2; TeacherName = MathTeacher2;
教师 ID = 3; 教师姓名 = 生物教师;
如何在播种数据时在 DbInitializer 中指定我想将 Match 主题链接到数学老师?
编辑:种子方法
protected override void Seed(SchoolContext context)
{
GetTeachers().ForEach(t => context.Teachers.Add(t));
GetSubjects().ForEach(s => context.Subjects.Add(s));
}
private static List<Subject> GetSubjects()
{
var subjects = new List<Subject> {
new Subject
{
SubjectID = 1,
SubjectName = "Math"
},
new Subject
{
SubjectID = 2,
SubjectName = "Biology"
},
new Subject
{
SubjectID = 3,
SubjectName = "English"
},
};
return subjects;
}
private static List<Teacher> GetTeachers()
{
var teachers = new List<Teacher> {
new Teacher
{
TeacherID = 1,
TeacherName = "Math Teacher",
TeacherOffice = "A007",
},
new Teacher
{
TeacherID = 2,
TeacherName = "Math Teacher 2",
TeacherOffice = "A008",
},
new Teacher
{
TeacherID = 3,
TeacherName = "Biology Teacher",
TeacherOffice = "A009",
},
};
return teachers;
}