此代码摘自 asp.net all in one reference for dummy 第 18 页和第 19 页的书。问题在于它无法编译。编译器说在当前上下文中找不到 txtFirst、txtSecond 和 lblAnswer。我是这个领域的新手,有人可以帮我吗?
<%@ 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 id="Head1" runat="server">
<title>Simple Calculator</title>
</head>
<body>
<form id="form2" runat="server">
<div>
<h1>The Simple Calculator</h1>
First number:
<asp:TextBox ID="txtFirst" runat="server" />
<br />
<br />
Second number:
<asp:TextBox ID="txtSecond" runat="server" />
<br />
<br />
<asp:Button ID="btnAdd" runat="server"
OnClick="btnAdd_Click" Text="Add" />
<br />
<br />
The answer is:
<asp:Label ID="lblAnswer" runat="server" />
</div>
</form>
</body>
</html>
using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
namespace WebApplication2
{
public partial class _Default : System.Web.UI.Page
{
protected void btnAdd_Click(object sender,EventArgs e)
{
decimal a = decimal.Parse(txtFirst.Text);
decimal b = decimal.Parse(txtSecond.Text);
decimal c = a + b;
lblAnswer.Text = c.ToString();
}
}
}