public Account OpenAccount(string id, string pwd, double money, double credit)
{
CreditAccount account = new CreditAccount(id, pwd, money, credit);
accounts.Add(account);
return(account);
}
// constructor for credit account
public Account OpenAccount(string id, string pwd, double limit)
{
Account account = new CreditAccount(id, pwd, limit);
_accounts.Add(account);
return(account);
}
public Account OpenAccount(double credit, string id, string pwd)
{
CreditAccount account = new CreditAccount(id, pwd, credit);
accounts.Add(account);
UpdateAccount(account);
return(account);
}
/// <summary>
/// 将普通账户升级为信用卡账户
/// </summary>
/// <param name="id">账户id</param>
/// <param name="credit">信用额度</param>
/// <returns>是否成功</returns>
public bool changeToCreditAccount(string id, decimal credit)
{
Account acc = this[id];
if (acc == null || acc is CreditAccount)
{
return(false); //账户不存在或已经是信用卡账户，无需升级
}
this[id] = new CreditAccount(acc, credit); //升级并更新原账户
return(true);
}
/// <summary>
/// 提升信用额度
/// </summary>
/// <param name="credit">提升至额度，应比当前额度高</param>
/// <returns></returns>
public decimal CreditUpTo(decimal credit)
{
if (!(account is CreditAccount))
{
return(0);
}
CreditAccount cAcc = account as CreditAccount;
decimal upCredit = credit - cAcc.Credit;
upCredit = upCredit > 0 ? upCredit : 0;
cAcc.CreditUp(upCredit);
return(upCredit);
}
private void ShowMoney()
{
Account acc = atm.GetAccount();
lblMoney.Text = "账户余额：" + acc.Money + "元";
if (acc is CreditAccount)
{
CreditAccount cAcc = acc as CreditAccount;
lblCredit.Text = $"信用总额度：{cAcc.Credit}元\r\n已透支取款：{cAcc.UsedCredit}元";
btnCreditOpen.Visible = false;
lblCredit.Visible = true;
btnCreditUp.Visible = true;
}
else
{
lblCredit.Visible = false;
btnCreditUp.Visible = false;
btnCreditOpen.Visible = true;
}
}