Disco.Services.Devices.ManagedGroups.DeviceBatchAssignedUsersManagedGroup.ProcessRepositoryEvent C# (CSharp) Method

        private void ProcessRepositoryEvent(RepositoryMonitorEvent Event)
        {
            var device = (Device)Event.Entity;
            string previousUserId = Event.GetPreviousPropertyValue<string>("AssignedUserId");

            Event.ExecuteAfterCommit(e =>
            {
                switch (e.EventType)
                {
                    case RepositoryMonitorEventType.Added:
                        AddMember(device.AssignedUserId);
                        break;
                    case RepositoryMonitorEventType.Modified:
                        if (device.DeviceBatchId == this.DeviceBatchId)
                        {
                            if (device.AssignedUserId != null)
                                AddMember(device.AssignedUserId);

                            if (e.ModifiedProperties.Contains("AssignedUserId"))
                            {
                                if (previousUserId != null)
                                    RemoveMember(previousUserId, (database) =>
                                        !database.Devices.Any(d => d.DeviceBatchId == this.DeviceBatchId && d.AssignedUserId == previousUserId)
                                            ? new string[] { previousUserId }
                                            : null);
                            }
                        }
                        else
                        {
                            if (previousUserId != null)
                                RemoveMember(previousUserId, (database) =>
                                    !database.Devices.Any(d => d.DeviceBatchId == this.DeviceBatchId && d.AssignedUserId == previousUserId)
                                        ? new string[] { previousUserId }
                                        : null);
                        }
                        break;
                    case RepositoryMonitorEventType.Deleted:
                        if (previousUserId != null)
                            RemoveMember(previousUserId, (database) =>
                                !database.Devices.Any(d => d.DeviceBatchId == this.DeviceBatchId && d.AssignedUserId == previousUserId)
                                    ? new string[] { previousUserId }
                                    : null);
                        break;
                }
            });
        }