Question

抱歉我的英语不好。

在将Windows窗体中的值传递给我所做的类定义时，我遇到了问题。

我已经在我的类定义中声明了七个数组，试图存储从所述窗口表单传递的值。我的问题是我经常遇到像

这样的错误

Cannot implicitly convert type 'string' to 'string[]'

我试图了解另一项给我的工作，但似乎仍然在我的工作上犯错误。

这是我的班级定义：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace BankTransaction
{

public class Transactions
{
    String username, password;
    decimal deposit, withdrawal, balance;
    decimal percentInterest;
    private decimal projectedInterest;
    private String uname;
    public string fName, lName, mInitial, pword, actType, uName;
    const Int64 MAX_SIZE = Int64.MaxValue;

    public static String[] firstName = new String [MAX_SIZE];
    public static String[] lastName = new String[MAX_SIZE];
    public static String[] mi = new String[MAX_SIZE];
    public static String[] pass = new String[MAX_SIZE];
    public static String[] userName = new String[MAX_SIZE];
    public static String[] accountType = new String[MAX_SIZE];
    public static decimal[] deposito = new decimal[MAX_SIZE];
    static int count = 0;
    public static int that;
    public static int number = 10001;

    public void registerLoginDetails()
    {
        firstName[count] = fName;
        lastName[count] = lName;
        mi[count] = mInitial;
        pass[count] = pword;
        accountType[count] = actType;
        userName[count] = uName;
        deposito[count] = deposit;
        count++;
        number++;
    }

    public decimal computeProjectedInterest(decimal initialBalance, decimal numOfYears)
    {

        if (numOfYears < 1)
        {
            percentInterest = 0.00m;
        }

        if (numOfYears > 0 && numOfYears <= 3)
        {
            percentInterest = 0.02m;
        }

        if (numOfYears > 3 && numOfYears <= 5)
        {
            percentInterest = 0.05m;
        }

        if (numOfYears > 5 && numOfYears <=10)
        {
            percentInterest = 0.08m;
        }

        if (numOfYears > 10)
        {
            percentInterest = 0.12m;
        }

        projectedInterest = initialBalance * percentInterest * numOfYears;
        return projectedInterest;
    }

    public decimal withdrawBalance()
    {
        return 0m;
    }

    public decimal depositBalance()
    {
        return 0m;
    }
}
}

这是我所说的WinForm的代码：

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using BankTransaction;

namespace LabExam1
{
public partial class Registration : Form
{

    const long size = Int64.MaxValue;
    public static Transactions trans = new Transactions();
    int i = 0;

    public void confirmRegistration()
    {

        Transactions.firstName = txtFname.Text;
        Transactions.lastName = txtLname.Text;
        Transactions.mi = txtMi.Text;
        Transactions.pass = txtPass.Text;
        Transactions.deposito = nudDeposit.Value;
        Transactions.accountType = cboType.Text;
        Transactions.userName = "";
        trans.registerLoginDetails();
        i++;


        this.Hide();
        Login lo = new Login();
        lo.ShowDialog();
    }

    public Registration()
    {
        InitializeComponent();
    }

    private void Form1_Load(object sender, EventArgs e)
    {
        cboType.SelectedIndex = 0;
    }

    private void btnRegister_Click(object sender, EventArgs e)
    {
        if (txtFname.Text == "" || txtLname.Text == "" || txtMi.Text == "" || txtPass.Text == "")
        {
            MessageBox.Show("Please fill up all required fields!", "ERROR", MessageBoxButtons.OK, MessageBoxIcon.Warning);
        }
        else
        {
            if (cboType.SelectedIndex == 0)
            {
                confirmRegistration();
            }

            if (cboType.SelectedIndex == 1)
            {
                if (nudDeposit.Value < 2500.00m)
                {
                    MessageBox.Show("The initial deposit for your account type is insufficient", "ERROR", MessageBoxButtons.OK, MessageBoxIcon.Warning);
                }

                else
                {
                    confirmRegistration();
                }
            }

            if (cboType.SelectedIndex == 2)
            {
                if (nudDeposit.Value < 3000.00m)
                {
                    MessageBox.Show("The initial deposit for your account type is insufficient", "ERROR", MessageBoxButtons.OK, MessageBoxIcon.Warning);
                }

                else
                {
                    confirmRegistration();
                }
            }
        }


    }

    private void btnExit_Click(object sender, EventArgs e)
    {
        Application.Exit();
    }

    private void btnGotoLogin_Click(object sender, EventArgs e)
    {
        this.Hide();
        Login lo = new Login();
        lo.ShowDialog();
    }

}

}

提前感谢所有回答我问题的人。

Answer 1

设置静态Transactions对象的公共属性时（一个可怕的设计，BTW，但我假设你还在学习......）你试图设置公共数组属性而不是个体价值属性：

    Transactions.firstName = txtFname.Text;
    Transactions.lastName = txtLname.Text;
    Transactions.mi = txtMi.Text;
    Transactions.pass = txtPass.Text;
    Transactions.deposito = nudDeposit.Value;
    Transactions.accountType = cboType.Text;
    Transactions.userName = "";

应该是

    Transactions.fName = txtFname.Text;
    Transactions.lName = txtLname.Text;
    Transactions.mInitial = txtMi.Text;
    Transactions.pword = txtPass.Text;
    Transactions.deposit = nudDeposit.Value;
    Transactions.actType = cboType.Text;
    Transactions.uName = "";

解决了编译器错误，但没有解决设计问题。如果这是一个可以原谅的学习项目，但有一些设计问题应该在某个时候解决（可能在codereview上）。

Answer 2

查看您的代码

Transactions.firstName = txtFname.Text;
Transactions.lastName = txtLname.Text;
Transactions.mi = txtMi.Text;
Transactions.pass = txtPass.Text;
Transactions.deposito = nudDeposit.Value;
Transactions.accountType = cboType.Text;

您正在使用String变量直接设置String数组，请尝试使用索引。

    Transactions.firstName[index] = txtFname.Text;
    Transactions.lastName[index] = txtLname.Text;
...

错误：无法将类型'string'隐式转换为'string []

2 个答案: