public void GetById(int id, Action <Participant, Exception> callback)
{
try
{
using (ParticipantsEntities _entities = new ParticipantsEntities())
{
var participant = _entities.Participants.Single(p => p.Id == id);
callback(participant, null);
}
}
catch (Exception e)
{
callback(null, e);
}
}
public void GetAll(Action <IEnumerable <Participant>, Exception> callback)
{
try
{
using (ParticipantsEntities _entities = new ParticipantsEntities())
{
var ps = _entities.Participants;
callback(ps, null);
}
}
catch (Exception e)
{
callback(null, e);
}
}
public void Delete(int id, Action <Exception> callback)
{
try
{
using (ParticipantsEntities _entities = new ParticipantsEntities())
{
var toBeRemoved = _entities.Participants.Single(item => item.Id == id);
_entities.Participants.Remove(toBeRemoved);
_entities.SaveChanges();
callback(null);
}
}
catch (Exception e)
{
callback(e);
}
}
public void Update(Participant participant, Action <Exception> callback)
{
try
{
using (ParticipantsEntities _entities = new ParticipantsEntities())
{
var old = _entities.Participants.Single(item => item.Id == participant.Id);
old.FirstName = participant.FirstName; // Not nice, but demo purpose only... ;-)
old.LastName = participant.LastName;
old.Company = participant.Company;
_entities.SaveChanges();
callback(null);
}
}
catch (Exception e)
{
callback(e);
}
}