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 |     [ServiceContract]
    [AspNetCompatibilityRequirements(RequirementsMode = AspNetCompatibilityRequirementsMode.Allowed)]
    [ServiceBehavior(InstanceContextMode = InstanceContextMode.Single,
    ConcurrencyMode = ConcurrencyMode.Multiple)]
    public class ServiceSession
    {
 
        private SynchronizedCollection<Session> Sessions = new SynchronizedCollection<Session>();
 
        public ServiceSession()
        {
        }
 
        [OperationContract]
        public List<Session> GetListSessions()
        {
            List<Session> result = null;
            try
            {
                result = this.Sessions.ToList();
            }
            catch (Exception e)
            {
                if (log.IsErrorEnabled)
                {
                    log.Error("Création d'une session de cours impossible", e);
                }
                result = null;
            }
            return result;
        }
 
        [OperationContract]
        public bool CreateCoursesSession(Teacher auteur, string name)
        {
            bool result = false;
            try
            {
                Session session = new Session(auteur, name);
                this.Sessions.Add(session);
                result = true;
            }
            catch (Exception e)
            {
                if (log.IsErrorEnabled)
                {
                    log.Error("Création d'une session de cours impossible", e);
                }
                result = false;
            }
            return result;
        } | 
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