Question

这一切都是......

命名空间Proxy_Pattern { 公共部分类Form1：表格 { 公共Form1（） { 的InitializeComponent（）; } double bankAmount = 1000.00;

    private void btnCheck_Click(object sender, EventArgs e)
    {
        double amount;
        amount = double.Parse(txtAmount.Text);

        CheckProxy cp =new CheckProxy();
        cp.CheckTransactionRequest(amount);
        lbltotal.Text = bankAmount.ToString();
    }

    private void btnCreditCard_Click(object sender, EventArgs e)
    {

    }
}


abstract class BankSubject
{

    public abstract void CreditTransactionRequest(double amount);
    public abstract void CheckTransactionRequest(double amount);
}

class RealBankSubject : BankSubject
{
    double bank;
    public RealBankSubject(double m_bacc)

    {
        bank = m_bacc;
    }

    public override void CreditTransactionRequest(double num)
    {
        bank -= num;
    }

    public override void CheckTransactionRequest(double num)
    {
        bank += num;
    }
}

不实现继承的抽象成员....但为什么？ class CreditCardProxy：BankSubject { RealBankSubject realSubject; 双倍金额;

    public CreditCardProxy (double m_bacc) 

    {
        amount = m_bacc ;
    }

没有合适的方法来覆盖？...这是一个错误怎么办？我有一个方法吗？

    public override void CreditTransactionRequest()
    {


         if (realSubject == null)
        {
            realSubject = new RealBankSubject(amount);
        }

        realSubject.CreditTransactionRequest(amount);
    }

    public override void CheckTransactionRequest()
    {

    }
}


class CheckProxy : BankSubject
{
    RealBankSubject realSubject;
    double amount;

    public override void CreditTransactionRequest()
    { 

    }

    public override void CheckTransactionRequest()
    {

       if (realSubject == null)
        {
            realSubject = new RealBankSubject(amount);
        }

        realSubject.CheckTransactionRequest(amount);
    }
}

}

Answer 1

CreditTransactionRequest中的{p> CreditCardProxy不接受任何参数，但CreditTransactionRequest中BankSubject的参数不同。这就是为什么你不能覆盖签名不匹配的方法。

Answer 2

在您的代理中，您没有将金额指定为方法的参数：

public override void CreditTransactionRequest();

所以它无法覆盖

public abstract void CreditTransactionRequest(double amount);

因为方法签名不匹配

代理模式没有找到合适的方法来覆盖？帮助我不知道出了什么问题

2 个答案: