public async Task <bool> UnregisterSubjectAsync(Subject subject)
{
var actualRegsiteredSubject = subject.ActualRegisteredSubject;
var result = subject.Unregister();
if (result)
{
await Task.Factory.StartNew(() => Model.DataManager.Instance.DeleteRegisteredSubject(actualRegsiteredSubject));
await Task.Factory.StartNew(() => Model.DataManager.Instance.UpdateSubject(subject));
RegisteredSubjectsChanged?.Invoke(this, null);
return(true);
}
return(false);
}
public async Task RegisterSubjectAsync(Subject subject, Term selectedTerm)
{
var registeredSubject = subject.Register();
var result = selectedTerm.RegisterSubject(registeredSubject);
if (result)
{
await Task.Factory.StartNew(() => Model.DataManager.Instance.AddRegisteredSubject(registeredSubject));
await Task.Factory.StartNew(() => Model.DataManager.Instance.UpdateSubject(subject));
RegisteredSubjectsChanged?.Invoke(this, null);
}
else
{
subject.RollbackRegistration(registeredSubject);
}
}
