Question

因此，我有一个发票总额表格，其中应计算折扣率。我在代码中添加了第二个表单，该表单允许您更改营业税。我将其填充到表单中，并且实际上没有任何错误，但是我无法将其从frmSalesTax上的文本框中移动到{ {1}}在frmInvoiceTotal中。

frmInvoice总代码：

txtSalesTax.Text

发票总GUI：

frmSalesTax代码：

 public frmInvoiceTotal()
    {
        InitializeComponent();
    }
    frmSalesTax percent = new frmSalesTax();
    private void btnCalculate_Click(object sender, EventArgs e)
    {
        decimal productTotal = Convert.ToDecimal(txtProductTotal.Text);
        decimal salesTax = (7.75m/100m) *  productTotal;
        decimal discountPercent = .0m;

        if (productTotal < 100)
            discountPercent = .0m;
        else if (productTotal >= 100 && productTotal < 250)
            discountPercent = .1m;
        else if (productTotal >= 250)
            discountPercent = .25m;

        decimal discountAmount = (productTotal + salesTax) * discountPercent;
        decimal subtotal = productTotal - discountAmount;
        decimal invoiceTotal = (subtotal + salesTax) - discountAmount;


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

        txtProductTotal.Focus();
    }

private void btnChange_Click(object sender, EventArgs e)
    {
        percent.salesTax = txtSalesTax.Text;
        switch (percent.ShowDialog())
        {
            case DialogResult.OK:
                txtSalesTax.Text = percent.salesTax;
                break;
        }

    }

    private void btnExit_Click(object sender, EventArgs e)
    {
        this.Close();

    }

我知道我想念什么，但我不知道是什么。

salesTax GUI：

Answer 1

您有正确的想法在frmSalesTax上建立一个属性以进行通信...但是您并没有真正使用它。

在您的frmInvoiceTotal中，您需要将当前值发送到frmSalesTax.salesTax，然后处理返回DialogResult.OK的百分比对话框的结果：

private void btnChange_Click(object sender, EventArgs e)
{
    percent.salesTax = txtSalesTax.Text; //--> send current value to frmSalesTax
    switch ( percent.ShowDialog() ) //--> ShowDialog will return the DialogResult of the pressed button
    {
       case DialogResult.OK:
         txtSalesTax.Text = percent.salesTax;  //--> update with new value from frmSalesTax
         break;
    }                    
}

...，并且在用户单击“确定”按钮时，需要在frmSalesTax中将txtPercent.Text放入salesTax属性中。

private void btnOk_Click(object sender, EventArgs e)
{
    this.salesTax = txtPercent.Text;  //--> frmInvoiceTotal will read this after the OK button is clicked
    txtPercent.Text = "";

    Hide();
}

重要：您必须确保frmSalesTax按钮设置了DialogResult，以便frmInvoiceTotal.btnOk_Click知道可以获取该值：< / p>

修改

（frmSalesTax中的属性）不必基于表单的文本值...因为在表单隐藏时将其设置为“”。这就是您想要的属性：

public string salesTax
{ 
  get;
  set;
}

这将与我前面提到的其他更改保持一致。

编辑2

很容易感到沮丧。有很多动人的东西，我可以理解眼睛如何交叉。这是问题的症结所在-您的计算正在浪费您的东西；-）

btnCalculate_Click中的这些行：

decimal salesTax = (7.75m/100m) *  productTotal;
decimal discountPercent = .0m;
//...
txtSalesTax.Text = salesTax.ToString("c");
txtDiscountPercent.Text = discountPercent.ToString("p1");

...应为初始值，并包含在表单的初始化代码中：

public frmInvoiceTotal()
{
   InitializeComponent();
   decimal salesTax = (7.75m/100m) *  productTotal;
   decimal discountPercent = .0m;
   txtSalesTax.Text = salesTax.ToString("c");  //--> the initial value
   txtDiscountPercent.Text = discountPercent.ToString("p1");
}

...然后，应该不重新填充txtSalesTax.Text或txtDiscountPercent.Text。 txtSalesTax.Text可能会从显示frmSalesTax开始更新，我想您可能会制作另一种形式来覆盖折扣百分比。

private void btnCalculate_Click(object sender, EventArgs e)
{
    decimal productTotal = Convert.ToDecimal(txtProductTotal.Text);
    decimal salesTax = Convert.ToDecimal(salesTax.Text) * productTotal;  //--> if it got changed in frmSalesTax
    decimal discountPercent = .0m;

    if (productTotal < 100)
        discountPercent = .0m;
    else if (productTotal >= 100 && productTotal < 250)
        discountPercent = .1m;
    else if (productTotal >= 250)
        discountPercent = .25m;

    decimal discountAmount = (productTotal + salesTax) * discountPercent;
    decimal subtotal = productTotal - discountAmount;
    decimal invoiceTotal = (subtotal + salesTax) - discountAmount;


    txtSubtotal.Text = subtotal.ToString("c");
    //txtSalesTax.Text = salesTax.ToString("c"); //--> don't do this...it steps on what came from frmSalesTax
    //txtDiscountPercent.Text = discountPercent.ToString("p1");  //--> when you add another form to override this
    txtDiscountAmount.Text = discountAmount.ToString("c");
    txtTotal.Text = invoiceTotal.ToString("c");

    txtProductTotal.Focus();
}

我敢打赌，这会让您更加接近：-）

Answer 2

像这样更改代码：

private void btnChange_Click(object sender, EventArgs e)
{
    percent.salesTax = txtSalesTax.text;
    percent.ShowDialog();
}

在C＃

2 个答案: