将数据表更新为实体框架中的多个表

Question

我创建了一种通过实体框架将数据表中的数据添加到我的数据库中的表的方法，但是它只允许我填充一个表，并且我想在一个方法中填充多个表。

下面是我添加到学生表的方法，我已经注释掉了模块表，因为当我添加它时，没有数据传输到数据库。有人可以推荐一种我可以在此方法中填充多个表的方法吗？

谢谢

public Boolean ConvertDataTable(DataTable tbl)
    {
        string Feedback = string.Empty;
        ModuleEntities db = new ModuleEntities();
        // iterate over your data table
        foreach (DataRow row in tbl.Rows)
        {

            student st = new student();
            st.student_no = row.ItemArray.GetValue(0).ToString();
            st.surname = row.ItemArray.GetValue(1).ToString();
            st.firstname = row.ItemArray.GetValue(2).ToString();
            db.students.Add(st);
            //module mod = new module();
            //mod.module_code = row.ItemArray.GetValue(3).ToString();
            //mod.name = row.ItemArray.GetValue(4).ToString();
            //db.modules.Add(mod);


        }
        try
        {
            db.SaveChanges();
            Feedback = "Upload Successful";
            return true;
        }
        catch
        {
            Feedback = "Upload Failed";
            return false;
        }

    }

学生班

public partial class student
{
    public student()
    {
        this.submits = new HashSet<submit>();
        this.takes = new HashSet<take>();
        this.lecturers = new HashSet<lecturer>();
    }

    public string student_no { get; set; }
    public string surname { get; set; }
    public string firstname { get; set; }

    public virtual ICollection<submit> submits { get; set; }
    public virtual ICollection<take> takes { get; set; }
    public virtual ICollection<lecturer> lecturers { get; set; }
}

模块类

public partial class module
{
    public module()
    {
        this.takes = new HashSet<take>();
        this.lecturers = new HashSet<lecturer>();
    }

    public string module_code { get; set; }
    public string name { get; set; }

    public virtual ICollection<take> takes { get; set; }
    public virtual ICollection<lecturer> lecturers { get; set; }
}

上课

public partial class take
{
    public string student_no { get; set; }
    public string module_code { get; set; }
    public string grade { get; set; }

    public virtual module module { get; set; }
    public virtual student student { get; set; }
}

Answer 1

以下是使用实体框架将相关数据添加到数据库的要点：

class Program
{
    static void Main(string[] args)
    {
        SchoolDBEntities dataContext = new SchoolDBEntities();
        //Create student object
        Student student1 = new Student();
        student1.StudentName = "Student 01";
        //Create course objects
        Cours mathCourse = new Cours();
        mathCourse.CourseName = "Math";
        Cours scienceCourse = new Cours();
        scienceCourse.CourseName = "Science";
        //Save courses to student 1
        student1.Courses.Add(mathCourse);
        student1.Courses.Add(scienceCourse);
        //Save related data to database
        //This will automatically populate join table
        //between Students and Courses
        dataContext.Students.Add(student1);
        dataContext.SaveChanges();
    }
}

另一个插图：