Question

我是C＃的新手，我创建了一个包含2个类的小程序（1个是包含main方法的类）。

讲师班：

namespace Exercise4
{
    class Account
    {

        public long accountNo { set; get; }
        public double balance { set; get; }
        public string [] payees { set; get; }
        public long [] payeesAccount { set; get; }

        public Account()
        {
            this.accountNo = 0L;
            this.balance = 0.0;
        }

        public Account(long accountNo,double balance)
        {
            this.accountNo = accountNo;
            this.balance = balance;
        }

        public Account(long accountNo, double balance, string [] payees, long [] payeesAccount)
        {
            this.accountNo = accountNo;
            this.balance = balance;
            this.payees = payees;
            this.payeesAccount = payeesAccount;
        }

        public int DebitAmount(double amount)
        {
            if ((this.balance - amount) <= this.balance)
                return 1;
            else
                return 0;
        }

        public int TransferMoney(long payeeAccountNo, double amount)
        {
            if (payeesAccount.Contains(payeeAccountNo))
                return DebitAmount(amount);
            else
                return -1;
        }

        public int TransferMoeny(string nickName,double amount)
        {
            if (payees.Contains(nickName))
                return DebitAmount(amount);
            else
                return -1;
        }

        public string ToString()
        {
            string output = "";

            output += "\nAccount Number: " + this.accountNo;
            output += "\nBalance: " + this.balance;
            output += "\nPayee: " + this.payees;
            output += "\nPayee Account: " + this.payeesAccount;

            return output;
        }


    }
}

主要方法类：

namespace Exercise4
{
    class Program
    {

        static void Main(string[] args)
        {

            string [] payee = new [] {"Oli"};
            long[] payeesAccount = new[] {1000L};

            Account reg = new Account(1000,100.00,payee,payeesAccount);

            Console.WriteLine(reg.ToString());

        }
    }
}

我试图打印数组的值（收款人：Oli，收款人帐户：1000），而不是：

帐号：1000 余额：100 收款人：System.String [] 收款人帐户：System.Int64 []

有什么想法？感谢

Answer 1

您可以将string.Join用于此目的

尝试定义您的方法ToString()，如下所示：

public override string ToString()
    {
        string output = "";

        output += "\nAccount Number: " + this.accountNo;
        output += "\nBalance: " + this.balance;
        output += "\nPayee: " + string.Join(",", this.payees);
        output += "\nPayee Account: " + string.Join(",", this.payeesAccount);

        return output;
    }

Answer 2

如果您正确覆盖默认方法ToString()，那么您可以像这样使用它：

Console.WriteLine(reg);

无需明确地称呼它。

你的overriden方法应如下所示，使用string builder来正确创建动态字符串：

public override string ToString()
{
    var output = new StringBuilder();

    output.Append("\nAccount Number: " + this.accountNo);
    output.Append("\nBalance: " + this.balance);
    output.Append("\nPayee: " + string.Join(", ", this.payees));
    output.Append("\nPayee Account: " + string.Join(", ", this.payeesAccount));

    return output.ToString();
}

使用字符串插值C# 6.0+更好：

public override string ToString()
{
    var output = new StringBuilder();

    output.Append($"Account Number: {accountNo}\n");
    output.Append($"Balance: {balance}\n");
    output.Append($"Payee: {string.Join(", ", payees)}\n");
    output.Append($"Payee Account: {string.Join(", ", payeesAccount)}\n");

    return output.ToString();
}

但我可以建议您审核您的课程并确定您是否真的需要string[]而不仅仅是string，因为我看到您只有一个收款人及其帐户。

在main方法中创建一个对象。打印对象中的数组值

2 个答案: