/// <summary>
/// Остановить сервис сообщений и сохранить состояние.
/// </summary>
public void StopAndSave()
{
longPollService.MessagesReceived -= LongPollService_MessagesReceived;
messagesCacheService = null;
messagesUsersService = null;
dialogsService = null;
longPollService = null;
}
/// <summary>
/// Запустить сервис сообщений и восстановить состояние.
/// </summary>
public void StartAndRestore()
{
messagesCacheService = ServiceLocator.Current.GetInstance <IMessagesCacheService>();
messagesUsersService = ServiceLocator.Current.GetInstance <IMessagesUsersService>();
dialogsService = ServiceLocator.Current.GetInstance <IDialogsCacheService>();
longPollService = ServiceLocator.Current.GetInstance <VKLongPollService>();
longPollService.MessagesReceived += LongPollService_MessagesReceived;
}