public async Task CreateCourse(CourseDb course)
{
CourseStudentDb courseStudent = new CourseStudentDb()
{
Course = course,
};
_context.Add(course);
try
{
await _context.SaveChangesAsync();
}
catch (Exception ex)
{
throw new DBOperationException(ex);
}
}
public async Task StudentEnrollCourse(int studentId, int courseId)
{
CourseStudentDb courseStudent = new CourseStudentDb()
{
StudentId = studentId,
CourseId = courseId,
};
if (_context.CourseStudents.Any(x => x.CourseId == courseId && x.StudentId == studentId))
{
return;
}
_context.Add(courseStudent);
try
{
await _context.SaveChangesAsync();
}
catch (Exception ex)
{
throw new DBOperationException(ex);
}
}