我的程序没有使用新更新的total，而是使用原始的total
本文关键字：total 原始 程序 新更新 我的 更新 | 更新日期: 2023-09-27 17:50:59
期末考试，我必须用c#写一个程序。假设它是一个银行账户，用户可以从原始账户余额中添加或提取款项。程序本身工作，但由于某种原因，它确实使用更新后的余额第二次。相反，它仍然使用期初余额。举个例子，一开始你有100美元，取出20美元，新的余额是80美元。下次你添加或取出钱时，它会从100美元而不是80美元中取出钱。你知道我哪里做错了吗?
下面是目前为止的代码:namespace BankingAccount
{
public partial class Entrance : Form
{
public string name;
public int number;
public double total;
public double with;
public double dep;
public Entrance()
{
InitializeComponent();
}
private void btnEnter_Click(object sender, EventArgs e)
{
setVisPart1(true);
}
private void btnClear_Click(object sender, EventArgs e)
{
txtAcctName.Clear();
txtAcctName.Enabled = true;
txtAcctNumber.Clear();
txtAcctNumber.Enabled = true;
lblBalance.Text = "Beginning Balance:";
txtBalance.Clear();
txtBalance.Enabled = true;
setVisibility(false);
}
private void btnContinue_Click(object sender, EventArgs e)
{
string line;
int val;
double value;
name = txtAcctName.Text;
line = txtAcctNumber.Text;
if (int.TryParse(line, out val))
{
if (val < 0)
{
MessageBox.Show("Invalid number");
txtAcctNumber.Clear();
}
else
{
number = int.Parse(txtAcctNumber.Text);
txtAcctNumber.Enabled = false;
}
}
else
{
MessageBox.Show("Invalid number");
txtAcctNumber.Clear();
}
line = txtBalance.Text;
if (double.TryParse(line, out value))
{
total = double.Parse(txtBalance.Text);
txtBalance.Enabled = false;
lblBalance.Text = "Available Balance:";
}
else
{
MessageBox.Show("Invalid number");
txtBalance.Clear();
}
txtAcctName.Enabled = false;
setVisPart2(true);
btnContinue.Visible = false;
}
private void btnCalculate_Click(object sender, EventArgs e)
{
string line;
double value;
total = double.Parse(txtBalance.Text);
line = txtWithdrawal.Text;
if (double.TryParse(line, out value))
{
with = double.Parse(txtWithdrawal.Text);
}
else
{
MessageBox.Show("Invalid number");
txtWithdrawal.Clear();
}
line = txtDeposit.Text;
if (double.TryParse(line, out value))
{
dep = double.Parse(txtDeposit.Text);
}
else
{
MessageBox.Show("Invalid number");
txtDeposit.Clear();
}
Banking anAccount = new Banking(name, number, total, with, dep);
txtBalance.Text = anAccount.Balance.ToString("C");
txtWithdrawal.Clear();
txtDeposit.Clear();
}
private void setVisibility(bool visibilityValue)
{
lblName.Visible = visibilityValue;
lblNumber.Visible = visibilityValue;
lblBalance.Visible = visibilityValue;
lblWithdrawal.Visible = visibilityValue;
lblDeposit.Visible = visibilityValue;
txtAcctName.Visible = visibilityValue;
txtAcctNumber.Visible = visibilityValue;
txtBalance.Visible = visibilityValue;
txtWithdrawal.Visible = visibilityValue;
txtDeposit.Visible = visibilityValue;
btnCalculate.Visible = visibilityValue;
btnContinue.Visible = visibilityValue;
}
private void setVisPart1(bool visibilityValue)
{
lblName.Visible = visibilityValue;
lblNumber.Visible = visibilityValue;
lblBalance.Visible = visibilityValue;
txtAcctName.Visible = visibilityValue;
txtAcctNumber.Visible = visibilityValue;
txtBalance.Visible = visibilityValue;
btnContinue.Visible = visibilityValue;
}
private void setVisPart2(bool visibilityValue)
{
lblWithdrawal.Visible = visibilityValue;
lblDeposit.Visible = visibilityValue;
txtWithdrawal.Visible = visibilityValue;
txtDeposit.Visible = visibilityValue;
btnCalculate.Visible = visibilityValue;
}
}
}
这是我的类编码:
namespace BankingAccount
{
class Banking
{
private string acctName;
private int acctNumber;
private double balance;
private double withdrawal;
private double deposit;
public Banking(string name, int number, double total, double with, double dep)
{
acctName = name;
acctNumber = number;
balance = total;
withdrawal = with;
deposit = dep;
DetermineBalance();
}
public string AcctName
{
set
{
acctName = value;
}
get
{
return acctName;
}
}
public int AcctNumber
{
set
{
acctNumber = value;
}
get
{
return acctNumber;
}
}
public double Withdraw
{
set
{
withdrawal = value;
}
get
{
return withdrawal;
}
}
public double Deposit
{
set
{
deposit = value;
}
get
{
return deposit;
}
}
public double Balance
{
set
{
balance = value;
}
get
{
return balance;
}
}
public void DetermineBalance()
{
balance = balance + (deposit - withdrawal);
}
}
}
由于这是所有内存(即…没有使用数据库)，这都是作用域的问题。
Scope定义了什么变量在…每次在按钮单击中计算时，都定义了一个Banking对象。单击按钮方法完成后，此对象不可用。
要补救，在类级别声明它:
public partial class Entrance : Form
{
public string name;
public int number;
public double total;
public double with;
public double dep;
public Banking anAccount = new Banking(); // <---- declare it up here
我将把它留给"读者的任务"，你将如何做到这一点。就目前而言，我的答案对您没有帮助，因为您的构造函数需要参数。考虑删除该构造函数并使用对象的公共属性。每次点击计算，而不是重新创建Banking对象。设置属性，呼叫CalculateBalance
我认为问题在于ToString("C")在解析字符串的时刻翻倍它有一些唱歌不能正确解析