为什么不能在C#中继承类？

12 浏览
0 Comments

为什么不能在C#中继承类？

这个问题已经有了答案：

在C#中调用基本构造函数

我试图创建一个基本的银行系统来练习使用类，在创建父类“帐户”之后，我尝试创建一个“储蓄”类，该类将成为子类并继承属性和方法，但是，无论我查找什么都不会告诉我如何做到这一点。我会得到诸如“必须声明一个主体，因为它未标记为抽象、外部或部分”等错误。我真的不知道该怎么做才能让它工作，所以我希望这里有人能帮助我，以下是我的代码：

public class Account
{
    protected string name;
    protected string birthdate;
    protected string address;
    protected double balance;
    protected string status;
    protected string type;
    public Account(string customerName, string customerBirthdate, string customerAddress, int customerBalance)
    {
        name = customerName;
        birthdate = customerBirthdate;
        address = customerAddress;
        balance = customerBalance;
        status = "Ok";
        type = "Basic";         
    }
    public void customerDetails()
    {
        Console.WriteLine("Name: {0}, Birthdate: {1}, Address: {2}", name, birthdate, address);
    }
    public void accountDetails()
    {
        Console.WriteLine("Balance: £{0}, Account Status: {1}, Account Type: {2}", Math.Round(balance, 2), status, type);
    }
    private void updateStatus()
    {
        if (balance < 0) { status = "Overdrawn"; } else if (balance > 0 )
        {
            status = "Ok";
        }
    }
    public void deposit(int amount)
    {
        balance += amount;
        updateStatus();
    }
    public void withdraw(int amount)
    {
        balance -= amount;
        updateStatus();
    }
}
public class Savings : Account
{
    public Savings(string customerName, string customerBirthdate, string customerAddress, int customerBalance) : Account(customerName, customerBirthdate, customerAddress, customerBalance)
    {
        name = customerName;
        birthdate = customerBirthdate;
        address = customerAddress;
        balance = customerBalance;
        status = "Ok";
        type = "Basic";
    }
}

如果有人能帮忙，提前感谢！

admin 更改状态以发布 2023年5月22日
0

1 答案

0 Comments

代码应该像这样（基于账户改变）

public class Account
{
    protected string name;
    protected string birthdate;
    protected string address;
    protected double balance;
    protected string status;
    protected string type;
    public Account(string customerName, string customerBirthdate, string customerAddress, int customerBalance)
    {
        this.name = customerName;
        this.birthdate = customerBirthdate;
        this.address = customerAddress;
        this.balance = customerBalance;
        this.status = "Ok";
        this.type = "Basic";
    }
    public void customerDetails()
    {
        Console.WriteLine("Name: {0}, Birthdate: {1}, Address: {2}", name, birthdate, address);
    }
    public void accountDetails()
    {
        Console.WriteLine("Balance: £{0}, Account Status: {1}, Account Type: {2}", Math.Round(balance, 2), status, type);
    }
    private void updateStatus()
    {
        if (balance < 0)
        {
            status = "Overdrawn";
        }
        else if (balance > 0)
        {
            status = "Ok";
        }
    }
    public void deposit(int amount)
    {
        balance += amount;
        updateStatus();
    }
    public void withdraw(int amount)
    {
        balance -= amount;
        updateStatus();
    }
}
public class Savings : Account
{
    public Savings(string customerName, string customerBirthdate, string customerAddress, int customerBalance) : base (customerName, customerBirthdate, customerAddress, customerBalance)
    {
        base.name = customerName;
        base.birthdate = customerBirthdate;
        base.address = customerAddress;
        base.balance = customerBalance;
        base.status = "Ok";
        base.type = "Basic";
    }
}

0