計算或清除將無法工作

Question

我正在使用Windows窗體。 每次按“計算”或“清除”時，什么都不會發生。 表單已加載，但按鈕不起作用。 文本框保持清晰，沒有任何值。 Visual Studio不會將代碼識別為錯誤。 有什么幫助嗎？

    namespace WindowsFormsApplication8
    {
public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();
    }

    private void Form1_Load(object sender, EventArgs e)
    {

    }
        int numberOfInvoices = 0;
        decimal totalOfInvoices = 0m;
        decimal invoiceAverage = 0m;

    private void btnCalculate_Click(object sender, EventArgs e)
    {
        decimal txtSubtotal = Convert.ToDecimal(txtEnterSubtotal.Text);
        decimal discountPercent = .25m;
        if (txtSubtotal >= 500)
        {
            discountPercent = .2m;
        }
        else if (txtSubtotal >= 250 && txtSubtotal < 500)
        {
            discountPercent = .15m;
        }
        else if (txtSubtotal >= 100 && txtSubtotal < 250)
        {
            discountPercent = .1m;
        }
        else
        {
            discountPercent = .0m;
        }

        decimal discountAmount = Math.Round(txtSubtotal * discountPercent, 2);
        decimal invoiceTotal = txtSubtotal - discountAmount;

        this.txtSubtotal.Text = txtSubtotal.ToString("c");
        txtDiscountPercent.Text = discountPercent.ToString("p1");
        txtDiscountAmount.Text = discountAmount.ToString("c");
        txtTotal.Text = invoiceTotal.ToString("c");

        numberOfInvoices++;
        totalOfInvoices += invoiceTotal;
        invoiceAverage = totalOfInvoices / numberOfInvoices;

        txtNumberOfInvoices.Text = numberOfInvoices.ToString();
        txtTotalOfInvoices.Text = totalOfInvoices.ToString("c");
        txtInvoiceAverage.Text = invoiceAverage.ToString("c");

        txtEnterSubtotal.Text = "";
        txtEnterSubtotal.Focus();
    }

    private void btnClearTotals_Click(object sender, System.EventArgs e)
    {
        numberOfInvoices = 0;
        totalOfInvoices = 0m;
        invoiceAverage = 0m;

        txtNumberOfInvoices.Text = "";
        txtTotalOfInvoices.Text = "";
        txtInvoiceAverage.Text = "";

        txtEnterSubtotal.Focus();
    }
}
}

非常感謝您的幫助，請告訴我如何改進。

Answer 1

您的兩個點擊處理程序似乎都可以正常工作。 我猜您由於某種原因沒有將它們連接到按鈕對象。 也許您創建了它們，保存了Form1.cs文件，然后在設計器中打開了Form並單擊undo或類似的東西。

通過在設計器中打開表單，雙擊按鈕，然后將代碼移至設計器創建的新方法，您應該能夠使它們再次工作。

連接后，Form1.Designer.cs應包含以下行：

this.btnCalculate.Click += new System.EventHandler(this.btnCalculate_Click);

和清除按鈕類似。