從一個輿論調查的制作談面向對象的編程思路（五）
2024-07-21 02:16:41
供稿：網友
好了，現在萬事俱備，只欠東風了，讓我們看看現在做一個輿論調查多么簡單：
file : vote.aspx
<%@ page language="c#" codebehind="vote.cs" autoeventwireup="false" inherits="football.vote" %>
<html>
<head>
<title>532.com.cn --- 輿論調查 ---</title>
<link rel="stylesheet" href="style/style.css" type="text/css">
</head>
<body>
<form method="post" runat="server">
<table width=400 height=300 align=center>
<tr>
<td class=cn valign=top align=center><b>調查題目：
<asp:label id="lblsurveytitle" runat=server class=cn></asp:label>
</td>
</tr>
<tr>
<td alin=center>
<asp:image id="imgsurvey" runat=server></asp:image>
</td>
</tr>
<tr>
<td align=center>
<input type=button onclick="window.close();" value="關閉此窗口">
</td>
</tr>
</table>
</form>
</body>
</html>
file: vote.cs
namespace football
{
using system;
using system.collections;
using system.componentmodel;
using system.data;
using system.drawing;
using system.web;
using system.web.sessionstate;
using system.web.ui;
using system.web.ui.webcontrols;
using system.web.ui.htmlcontrols;
/// <summary>
/// summary description for vote.
/// </summary>
public class vote : system.web.ui.page
{
protected system.web.ui.webcontrols.image imgsurvey;
protected system.web.ui.webcontrols.label lblsurveytitle;
private string m_strsurveyid ;
private int m_intvoteid ;
public vote()
{
page.init += new system.eventhandler(page_init);
}
protected void page_load(object sender, eventargs e)
{
if (!ispostback)
{
//
// evals true first time browser hits the page
//
}
}
protected void page_init(object sender, eventargs e)
{
//
// codegen: this call is required by the asp+ windows form designer.
//
initializecomponent();
init() ;
}
/// <summary>
/// required method for designer support - do not modify
/// the contents of this method with the code editor.
/// </summary>
private void initializecomponent()
{
this.load += new system.eventhandler (this.page_load);
}
private void init()
{
m_strsurveyid = request["surveyid"].tostring() ;
footballsurvey mysurvey = new footballsurvey() ;
try
{
m_intvoteid = request["vote"].toint32() ;
mysurvey.loadfromdatabase(m_strsurveyid) ;
lblsurveytitle.text = mysurvey.title ;
if (m_intvoteid < mysurvey.items.count)
{
mysurvey.vote(m_intvoteid) ;
}
mysurvey.createresultimage(server.mappath("survey.jpg") ,
myclass.util.mychart.charttype.pie ,
300 ,300 , color.white) ;
imgsurvey.imageurl = "survey.jpg" ;
}
catch(exception e)
{
#if debug
response.write ("初始化頁面錯誤：" + e.tostring()) ;
return ;
#endif
page.navigate("error.aspx") ;
}
}
}
}
要看這個調查的效果，請到http://210.12.102.95/football 。怎么樣，是不是覺得這種編程思路不錯呢？什么？還不如直接在aspx文件里面做？不錯，如果單做這么一個調查的確直接做要省事的多，但你知不知道，只要有編譯好的這個類的dll，不管你怎么改頁面，改數據結構，你都可以在15分鐘內把你所需要的輿論調查做出來？這就是這兩種編程方法最大的區別。希望通過這個例子你能學到一些編程思想把。
