public static void Main()
{
using (var context = CreateContext())
{
foreach (var student in context.Students.ToArray()) context.Students.Remove(student);
foreach (var subject in context.Subjects.ToArray()) context.Subjects.Remove(subject);
context.SaveChanges();
}
using (var context = CreateContext())
{
var fred = new Student("Fred", "Flintstone");
var barney = new Student("Barney", "Rubble");
context.Students.Add(fred);
context.Students.Add(barney);
var law = new Subject("Law");
context.Subjects.Add(law);
context.SaveChanges();
}
using (var context = CreateContext())
{
var fred = context.Students.First(s => s.FirstName == "Fred");
var law = context.Subjects.Single();
fred.EnrolIn(law);
context.SaveChanges();
}
using (var context = CreateContext())
{
var barney = context.Students.First(s => s.FirstName == "Barney");
var law = context.Subjects.Single();
barney.EnrolIn(law);
context.SaveChanges();
}
using (var context = CreateContext())
{
var fred = context.Students.First(s => s.FirstName == "Fred");
var law = context.Subjects.Single();
fred.CancelEnrolmentIn(law);
context.SaveChanges();
}
Console.ReadKey();
}
public void EnrolIn(Subject subject)
{
subject.AcceptEnrolmentFor(this);
EnrolledInSubjects.Add(subject);
}
public void CancelEnrolmentIn(Subject subject)
{
subject.CancelEnrolmentFor(this);
EnrolledInSubjects.Remove(subject);
}