我正在从我之前创建的控制台应用程序创建一个 ASP.NET 应用程序。我在尝试执行此操作时遇到问题。控制台应用程序是一个计算器，用于查找贷款的每月付款。我被困在如何让 MonthlyPayment 计算在 ASP.NET 编码中工作。
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace LoanCalculator
{
public class LoanCalculator
{
public static void Main(string[] args)
{
// declare variables
double principle = 0;
double years = 0;
double interest = 0;
string principleInput, yearsInput, interestInput;
// User input for Principle amount in dollars
Console.Write("Enter the loan amount, in dollars(0000.00): ");
principleInput = Console.ReadLine();
principle = double.Parse(principleInput);
//Prompt the user to reenter any illegal input
if (principle < 0)
{
Console.WriteLine("The value for the mortgage cannot be a negative value");
principle = 0;
}
// User input for number of years
Console.Write("Enter the number of years: ");
yearsInput = Console.ReadLine();
years = double.Parse(yearsInput);
//Prompt the user to reenter any illegal input
if (years < 0)
{
Console.WriteLine("Years cannot be a negative value");
years = 0;
}
// User input for interest rate
Console.Write("Enter the interest rate(%): ");
interestInput = Console.ReadLine();
interest = double.Parse(interestInput);
//Prompt the user to reenter any illegal input
if (interest < 0)
{
Console.WriteLine("The value for the interest rate cannot be a negative value");
interest = 0;
}
//Calculate the monthly payment
//ADD IN THE .Net function call Math.pow(x, y) to compute xy (x raised to the y power).
double loanM = (interest / 1200.0);
double numberMonths = years * 12;
double negNumberMonths = 0 - numberMonths;
double monthlyPayment = principle * loanM / (1 - System.Math.Pow((1 + loanM), negNumberMonths));
//double totalPayment = monthlyPayment;
//Output the result of the monthly payment
Console.WriteLine(String.Format("The amount of the monthly payment is: {0}{1:0.00}", "$", monthlyPayment));
Console.WriteLine();
Console.WriteLine("Press the Enter key to end. . .");
Console.Read();
}
}
}
我现在拥有的页面标记代码是
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>Monthly Mortgage Calculator</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<h1>Monthly Payment Loan Calculator</h1>
</div>
<asp:Label ID="Label1" runat="server" Text="Please enter the principle amount"></asp:Label>
<asp:TextBox ID="txtPrinciple" runat="server"
ontextchanged="txtPrinciple_TextChanged"></asp:TextBox>
<br />
<br />
<asp:Label ID="Label2" runat="server"
Text="Please enter the loan duration in years"></asp:Label>
<br />
<asp:RadioButtonList ID="rblYears" runat="server" AutoPostBack="True"
onselectedindexchanged="rblYears_SelectedIndexChanged">
<asp:ListItem Value="15">15 Years</asp:ListItem>
<asp:ListItem Value="30">30 Years</asp:ListItem>
<asp:ListItem>Other</asp:ListItem>
</asp:RadioButtonList>
<br />
<asp:TextBox ID="txtYears" runat="server" Enabled="False"></asp:TextBox>
<br />
<br />
<asp:Label ID="Label3" runat="server" Text="Please select the interest rate"></asp:Label>
<asp:DropDownList ID="ddlInterestRate" runat="server">
<asp:ListItem>1</asp:ListItem>
<asp:ListItem>2</asp:ListItem>
<asp:ListItem>3</asp:ListItem>
<asp:ListItem>4</asp:ListItem>
<asp:ListItem>5</asp:ListItem>
<asp:ListItem>6</asp:ListItem>
<asp:ListItem>7</asp:ListItem>
<asp:ListItem>8</asp:ListItem>
<asp:ListItem>9</asp:ListItem>
<asp:ListItem>10</asp:ListItem>
</asp:DropDownList>
<br />
<br />
<asp:Button ID="Button1" runat="server" onclick="Button1_Click"
Text="Monthly Payment" />
<br />
<br />
<asp:Label ID="Label4" runat="server"></asp:Label>
</form>
</body>
</html>
最后，我当前的 aspx.cs 代码是：
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
public partial class _Default : System.Web.UI.Page
{
//double principle = 0;
//double years = 0;
double interest = 0;
//string principalInput, yearsInput, interestInput;
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
txtYears.Enabled = false;
}
}
protected void Button1_Click(object sender, EventArgs e)
{
double principle = 0.0;
double principleInput = double.Parse(txtPrinciple.Text);
double years = double.Parse(txtYears.Text);
var yearDuration = rblYears.SelectedValue;
double interestInput = double.Parse(ddlInterestRate.SelectedValue);
if (double.TryParse(txtPrinciple.Text, out principle))
{
}
}
protected void rblYears_SelectedIndexChanged(object sender, EventArgs e)
{
if (rblYears.SelectedIndex == 3)
txtYears.Enabled = true;
else
{
txtYears.Text = "";
txtYears.Enabled = false;
}
}
protected void txtPrinciple_TextChanged(object sender, EventArgs e)
{
// principle = double.Parse(txtPrinciple.Text);
}
}
我知道这并不完整，我只是遇到了一个障碍，想知道我是否朝着正确的方向前进。如果有人可以请以正确的方式引导我，将不胜感激。谢谢你们。