public void AddUser(UserId userId, string userName)
{
ApplyChange(new NewUserAdded(Id, userId, userName));
}
public void ChangeUserName(UserId userId, string newUserName)
{
ApplyChange(new UserNameChanged(userId, newUserName));
}
private void When(NewUserAdded @event)
{
Id = new UserId(@event.UserId);
UserName = @event.UserName;
}