Question

我试图将投资的名称显示在库存的列表框中，但代码（我之前在程序中使用过）似乎不起作用。

   namespace JamesClemens_FinalProject
 {
public partial class Form1 : Form
{
    ArrayList account;

    public Form1()
    {
        InitializeComponent();
        account = new ArrayList();
    }

    //here we set up our add customer button from the first tab
    //when the information is filled in and the button is clicked
    //the name on the account will be put in the combobox on the second tab
    private void btnAddCustomer_Click(object sender, EventArgs e)
    {
        try
        {
            CustomerAccount aCustomerAccount = new CustomerAccount(txtAccountNumber.Text, txtCustomerName.Text,
            txtCustomerAddress.Text, txtPhoneNumber.Text);
            account.Add(aCustomerAccount);

            cboClients.Items.Add(aCustomerAccount.GetCustomerName());
            ClearText();
        }
        catch (Exception)
        {
            MessageBox.Show("Make sure every text box is filled in!", "Error", MessageBoxButtons.OK);
        }
    }


    private void ClearText()
    {
        txtAccountNumber.Clear();
        txtCustomerName.Clear();
        txtCustomerAddress.Clear();
        txtPhoneNumber.Clear();
    }


    private void cboClients_SelectedIndexChanged(object sender, EventArgs e)
    {

        CustomerAccount custAccount = account[cboClients.SelectedIndex] as CustomerAccount;
 if(custAccount != null)
 {
     txtAccountNumberTab2.Text = custAccount.GetAccountNumber();
     txtCustomerNameTab2.Text = custAccount.GetCustomerName();
     txtCustomerAddressTab2.Text = custAccount.GetCustomerAddress();
     txtCustomerPhoneNumberTab2.Text = custAccount.GetCustomerPhoneNo();
}
    }

这是给我带来麻烦的代码，它一直说“新股票”不包含带有四个参数的构造函数。

  private void btnAddStock_Click(object sender, EventArgs e)
    {
        try
        {
            Stock aStock = new Stock(txtInvestmentID.Text, txtInvestmentName.Text,      txtInvestmentSymbol.Text,
                int.Parse(txtInvestmentShares.Text));
            account.Add(aStock);
            lstStock.Items.Add(aStock.GetInvestmentName());
            ClearText();
        }
        catch (Exception)
        {
            MessageBox.Show("Make sure every text box is filled in!", "Error", MessageBoxButtons.OK);
        }
    }

有谁知道为什么不让我使用Stock类？

这是你要求的股票类。公共类股票：投资 { //属性私人双股价格;

    //constructors
    public Stock()
    {
    }

    public Stock(string anInvestmentID, string anInvestmentName, string anInvestmentSymbol,
        int anInvestmentShare, CustomerAccount aCustomer, double aStockPrice)
        : base(anInvestmentID, anInvestmentName, anInvestmentSymbol, anInvestmentShare)
    {
        SetStockPrice(aStockPrice);
    }

   //
    public Stock(string anInvestmentID, string anInvestmentName, string anInvestmentSymbol,
        int anInvestmentShare, CustomerAccount aCustomer, double aStockPrice)
    {
        SetInvestmentID(anInvestmentID);
        SetInvestmentName(anInvestmentName);
        SetInvestmentSymbol(anInvestmentSymbol);
        SetInvestmentShare(anInvestmentShare);
        SetStockPrice(aStockPrice);
    }

    //set accessors
    public void SetStockPrice(double aStockPrice)
    {
        stockPrice = aStockPrice;
    }

    //get accessors
    public double GetStockPrice()
    {
        return stockPrice;
    }

Answer 1

请务必阅读您收到的错误消息;它使编程更容易。

错误信息非常清楚：

"new Stock" does not contain a constructor that takes four arguments.

您的Stock课程中没有构建者，其中包含四个参数。

查看您在Stock课程中发布的三个构造函数。计算需要传递到每个构造函数的参数数量。有一个只接受四个参数吗？我看到一个不带参数，两个带六个参数。

尝试理解错误消息的实际文本将在将来编写代码时对您有所帮助。大多数（不是全部，但大多数）错误消息都包含有意义的内容，可指向实际问题。：）

从文本框填充列表框

1 个答案: