using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
namespace XEx02Quotation
{
public partial class Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void Button1_Click(object sender, EventArgs e)
{
if (IsValid)
{
int SalesPrice = Convert.ToInt32(TextBox1.Text);
// When a user inputs an integer, I want it to be able to handle input of fractions
// without getting an exception error.
// If a user inputs a whole number or fractional number (like 20.25), it should be able
// to handle it.
double DiscountPercentage = Convert.ToDouble(TextBox2.Text);
double discountValue = this.CalculateDiscountValue(SalesPrice, DiscountPercentage);
double TotalPrice = this.TotalPriceCalculate(SalesPrice, discountValue);
Label1.Text = discountValue.ToString("c");
Label2.Text = TotalPrice.ToString("c");
}
}
protected double CalculateDiscountValue(int SalesPrice, double DiscountPercentage)
{
double discountAmount = SalesPrice * DiscountPercentage;
return discountAmount;
}
protected double TotalPriceCalculate(int SalesPrice, double discountAmount)
{
double TotalPrice = SalesPrice - discountAmount;
return TotalPrice;
}
}
}<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="XEx02Quotation.Default" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>Price quotation</title>
<style type="text/css">
.auto-style1 {
width: 54%;
height: 213px;
}
.auto-style15 {
width: 114px;
height: 23px;
}
.auto-style16 {
width: 114px;
}
.auto-style17 {
width: 114px;
height: 28px;
}
.auto-style18 {
width: 193px;
height: 23px;
}
.auto-style20 {
width: 193px;
height: 28px;
}
.auto-style21 {
width: 193px;
}
.auto-style22 {
margin-left: 12px;
}
.auto-style23 {
margin-left: 16px;
}
.auto-style25 {
width: 193px;
height: 5px;
}
.auto-style26 {
width: 114px;
height: 5px;
}
.auto-style27 {
width: 143px;
height: 23px;
}
.auto-style28 {
width: 143px;
height: 5px;
}
.auto-style29 {
width: 143px;
}
.auto-style30 {
width: 143px;
height: 28px;
}
.auto-style31 {
width: 143px;
height: 25px;
}
.auto-style32 {
width: 193px;
height: 25px;
}
.auto-style33 {
width: 114px;
height: 25px;
}
</style>
</head>
<body>
<form id="form1" runat="server">
<h1>Price quotation</h1>
<br />
<br />
<table class="auto-style1">
<tr>
<td class="auto-style27">Sales Price</td>
<td class="auto-style18">
<asp:TextBox ID="TextBox1" runat="server" CssClass="auto-style23" Width="173px" Font-Bold="True"></asp:TextBox>
</td>
<td class="auto-style15"></td>
</tr>
<tr>
<td class="auto-style27"></td>
<td class="auto-style18"></td>
<td class="auto-style15"></td>
</tr>
<tr>
<td class="auto-style27">Discount percent</td>
<td class="auto-style18">
<asp:TextBox ID="TextBox2" runat="server" CssClass="auto-style22" Width="169px"></asp:TextBox>
</td>
<td class="auto-style15"></td>
</tr>
<tr>
<td class="auto-style28">Discount amount</td>
<td class="auto-style25"> <asp:Label ID="Label1" runat="server" Font-Bold="True" Text="Label"></asp:Label>
</td>
<td class="auto-style26"></td>
</tr>
<tr>
<td class="auto-style27"></td>
<td class="auto-style18"></td>
<td class="auto-style15"></td>
</tr>
<tr>
<td class="auto-style30">Total price</td>
<td class="auto-style20">
<asp:Label ID="Label2" runat="server" Font-Bold="True" Text="Label"></asp:Label>
</td>
<td class="auto-style17"></td>
</tr>
<tr>
<td class="auto-style31">
</td>
<td class="auto-style32"></td>
<td class="auto-style33"></td>
</tr>
<tr>
<td class="auto-style29">
<asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="Calculate" Width="90px" />
</td>
<td class="auto-style21"> </td>
<td class="auto-style16"> </td>
</tr>
</table>
</form>
</body>
</html>
当我在文本框中输入销售价格作为分数（如120.99）并在折扣百分比文本框中输入int数字或双倍（如15或20.2）时，折扣金额和总价格不计算对？我是否需要对变量进行显式转换？我感到很困惑。这是我的Web应用程序中的ASP.NET Web表单的代码。我目前正在我的Default.aspx.cs（C＃）文件中工作（我也有一个Default.aspx文件）。
答案 0 :(得分：1)
正如评论和TaW的回答中所指出的那样，您应该使用decimal代替int并且总价格计算错过除以100 。我把所有东西放在一起。
点击处理程序应修改如下：
protected void Button1_Click(object sender, EventArgs e)
{
if (IsValid)
{
decimal salesPrice;
decimal discount;
if (decimal.TryParse(TextBox1.Text, out salesPrice))
{
if (decimal.TryParse(TextBox2.Text, out discount))
{
decimal discountValue = this.CalculateDiscountValue(salesPrice, discount);
decimal totalPrice = this.TotalPriceCalculate(salesPrice, discount);
Label1.Text = discountValue.ToString("c");
Label2.Text = totalPrice.ToString("c");
}
}
}
}
辅助方法如下：
protected decimal CalculateDiscountValue(decimal salesPrice, decimal discountPercentage)
{
return salesPrice * discountPercentage / 100m;
}
protected decimal TotalPriceCalculate(decimal salesPrice, decimal discountAmount)
{
return salesPrice - discountAmount;
}