虚拟属性的默认值

Question

So I have abstract class with following absract class:

public abstract class BankAccount
{
    public virtual double InterestRate { get; protected set; } = 2.35;

    public virtual double CalculateInterest(int months)
    {
        return months * this.InterestRate;
    }
}

then I have derived class:

public class LoanAccount : BankAccount
{
    public override double CalculateInterest(int months)
    {
        if ((this.Customer is Individual && months <= 3) || (this.Customer is Company && months <= 2))
        {
            this.InterestRate = 1.00;
        }
        return base.CalculateInterest(months);
    }
}

here is the invocation:

static void Main(string[] args)
{
    List<BankAccount> bankAccounts = new List<BankAccount>(10)
    {
        new LoanAccount(new Individual(), 1000)
    };

    Console.WriteLine(bankAccounts[0].CalculateInterest(4));
}

When I call loanAccount.CalculateInterest(4) when I enter base.CalculateInterest method all it gives me for InterestRate is 0 . Why? doesn't it have to be 2.35 since this property has a default value?

Answer 1

我设法回答了我的问题，问题是BankAccount中的属性是virtual ，然后在LoanAccount被覆盖，因此，当我调用CalculateInterest它使用派生类（ LoanAccount ）中的重写属性而不是虚拟的（在BankAccount ），这导致我认为使用虚拟属性应该非常小心。