SenseNet.Messaging.Subscription.UnSubscribeAll C# (CSharp) Méthode

        public static void UnSubscribeAll(User subscriber)
        {
            using (var context = new DataHandler())
            {
                var existing = context.Subscriptions.Where(
                    x => x.UserPath == subscriber.Path);

                if (existing.Count() > 0)
                {
                    context.Subscriptions.DeleteAllOnSubmit(existing);
                    context.SubmitChanges();
                }
            }
        }
        public static void UnSubscribeFrom(Node target)