为啥我不能在 C# 中继承一个类？ [复制]

Posted 2023-02-22

【中文标题】为啥我不能在 C# 中继承一个类？ [复制]

【英文标题】：Why can't I inherit a class in c#? [duplicate]为什么我不能在 C# 中继承一个类？ [复制]

【发布时间】：2019-08-10 09:47:07

【问题描述】：

我正在尝试创建一个基本的银行系统来练习使用类，在创建父类“Account”之后，我尝试创建一个“储蓄”类，它将作为子类并继承属性和方法，但是，无论我查找什么，都不会告诉我该怎么做。我收到诸如“必须声明一个主体，因为它没有标记为抽象、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可以提供帮助，这是我的代码：

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";
    

如果有人可以帮助我，请提前感谢！

【问题讨论】：

当要调用基类的构造函数时，应使用base关键字，而不是基类本身的名称。

docs.microsoft.com/en-us/dotnet/csharp/tutorials/inheritance 和 tutorialspoint.com/csharp/csharp_inheritance.htm

@JonathonChase 是对的，只需在 Savings 类中将 Account 类名称更改为 Base。 public Savings(string customerName, string customerBirthdate, string customerAddress, int customerBalance) : base(customerName, customerBirthdate, customerAddress, customerBalance)

@JonathonChase 非常感谢大家，真不敢相信我错过了！

【参考方案1】：

代码应该是这样的（按基地更改帐户）

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";