Well, now everything is ready, and we have nothing to worry about. Let's see how simple a public opinion survey is:
File: vote. aspx
<% @ Page language = "c #" Codebehind = "vote. cs" AutoEventWireup = "false" Inherits = "Football. vote" %>
<Html>
<Head>
<Title> 532.com.cn --- public opinion survey --- </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> survey subject:
<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 = "close this window">
</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 ("initialization page error:" + e. ToString ());
Return;
# Endif
Page. Navigate ("error. aspx ");
}
}
}
}
To view the results of this survey, go to http: // 210.12.102.95/football. Do you think this programming idea is good? What? Is it better to do it directly in the aspx file? Yes. If you do such a single investigation, it is really much easier to do, but do you know that as long as there is a compiled dll of this class, no matter how you change the page, change the data structure, can you do all the public opinion surveys you need within 15 minutes? This is the biggest difference between the two programming methods. I hope you can learn some programming ideas through this example.
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