EntityFramework 学习 一 Add Entity Graph using DbContext:

Create student in disconnected mode Student newStudent = new Student() { StudentName = "New Single Student" }; //Assign new standard to student entity newStudent.Standard = new Standard() { StandardName = "New Standard" }; //add new course with new teacher into student.courses newStudent.Courses.Add(new Course() { CourseName = "New Course for single student", Teacher = new Teacher() { TeacherName = "New Teacher" } }); using (var context = new SchoolDBEntities()) { context.Students.Add(newStudent); context.SaveChanges(); Console.WriteLine("New Student Entity has been added with new StudentId= " + newStudent.StudentID.ToString()); Console.WriteLine("New Standard Entity has been added with new StandardId= " + newStudent.StandardId.ToString()); Console.WriteLine("New Course Entity has been added with new CourseId= " + newStudent.Courses.ElementAt(0).CourseId.ToString()); Console.WriteLine("New Teacher Entity has been added with new TeacherId= " + newStudent.Courses.ElementAt(0).TeacherId.ToString()); }

 

EntityFramework 学习 一 Add Entity Graph using DbContext:

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