public void ChangePhoneType(IPhone phone)
{
int index = ListPhones.IndexOf(phone);
if (index == -1)
{
return;
}
IPhone newPhone = null;
if (phone is MobilePhone)
{
newPhone = new TownPhone();
newPhone.NumOfTele = phone.NumOfTele;
}
if (phone is TownPhone)
{
newPhone = new MobilePhone();
newPhone.NumOfTele = phone.NumOfTele;
}
if (phone.Equals(DefaultPhone))
{
DefaultPhone = newPhone;
}
ListPhones.Remove(phone);
ListPhones.Insert(index, newPhone);
}
