从文本框填充列表框

Question

我试图让投资的名称出现在股票的列表框中,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);
        }
    }

有谁知道为什么它不让我使用Stock类？

这是你要求的股票类.公共类股票:投资{//属性私人双股票价格;

    //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

请实际阅读您收到的错误消息; 它使编程更容易.

错误消息非常清楚:

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

您的Stock类中没有带有四个参数的构造函数.

看看你在Stock课堂上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为您提供很多帮助.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.:)