因此我购买了Murach的C#2015书籍,试图开始学习一些代码。我现在在一个关于阵列的部分,我被卡住了。数组似乎只接受一个输入。我需要它来接收用户的每个输入并保存,然后在消息框中反刍。我是否正确放置了阵列并正确循环?
这是代码批量
public partial class frmInvoiceTotal : Form
{
public frmInvoiceTotal()
{
InitializeComponent();
}
decimal[] totals = new decimal[5];
int index = 0;
// TODO: declare class variables for array and list here
private void btnCalculate_Click(object sender, EventArgs e)
{
try
{
if (txtSubtotal.Text == "")
{
MessageBox.Show(
"Subtotal is a required field.", "Entry Error");
}
else
{
for (index = 0; index < totals.Length; index++) //this the correct spot for the for loop?
{
decimal subtotal = Decimal.Parse(txtSubtotal.Text);
totals[index] = subtotal;
if (subtotal > 0 && subtotal < 10000)
{
decimal discountPercent = 0m;
if (subtotal >= 500)
discountPercent = .2m;
else if (subtotal >= 250 & subtotal < 500)
discountPercent = .15m;
else if (subtotal >= 100 & subtotal < 250)
discountPercent = .1m;
decimal discountAmount = subtotal * discountPercent;
decimal invoiceTotal = subtotal - discountAmount;
discountAmount = Math.Round(discountAmount, 2);
invoiceTotal = Math.Round(invoiceTotal, 2);
txtDiscountPercent.Text = discountPercent.ToString("p1");
txtDiscountAmount.Text = discountAmount.ToString();
txtTotal.Text = invoiceTotal.ToString();
}
else
{
MessageBox.Show(
"Subtotal must be greater than 0 and less than 10,000.",
"Entry Error");
}
}
}
}
catch (FormatException)
{
MessageBox.Show(
"Please enter a valid number for the Subtotal field.",
"Entry Error");
}
txtSubtotal.Focus();
}
private void btnExit_Click(object sender, EventArgs e)
{
MessageBox.Show("totals\n" + totals[0] + "\n"+ totals[1] + "\n" + totals[2] +
"\n" + totals[3] + "\n" + totals[4], "test");
//string totalsString = "";
//foreach (int index in totals)
//totalsString += subtotal + "\n";
//MessageBox.Show("The totals are:\n" +
//totalsString + "\n", "Order Totals");
// TODO: add code that displays dialog boxes here
this.Close();
}
}
}
答案 0 :(得分:0)
我在你的循环中看到你总是实例化索引&#39;因此,整个数组得到当前输入而不是下一个单元格。 如果我理解正确,你的for循环应该是这样的:
for(; index&lt; totals.Length; index ++){}
请注意,您将被限制为5个输入(阵列的初始大小)。