Programming | Objects Well, now everything is in the wind, let's see how simple it is to do a public opinion survey now:
File:vote.aspx
<%@ Page language= "C #" codebehind= "Vote.cs" autoeventwireup= "false" inherits= "Football.vote"%>
<title>532.com.cn---Public opinion survey---</title>
<link rel= "stylesheet" href= "Style/style.css" type= "Text/css" >
<body>
<form method= "POST" runat= "Server" >
<table width=400 height=300 align=center>
<tr>
<TD CLASS=CN valign=top align=center><b> survey Topics:
<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>
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 Browser hits the page
//
}
}
protected void Page_Init (object sender, EventArgs e)
{
//
Codegen:this the call are required by the asp+ Windows Form Designer.
//
InitializeComponent ();
Init ();
}
<summary>
Required to Designer support-do not modify
The contents is 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,
Color.White);
Imgsurvey.imageurl = "Survey.jpg";
}
catch (Exception e)
{
#if DEBUG
Response.Write ("Initialize page error:" + e.tostring ());
return;
#endif
Page.navigate ("error.aspx");
}
}
}
}
To see the effect of this survey, please go to Http://210.12.102.95/football. How do you think this is a good programming idea? What the? Why not just do it directly in the ASPX file? Yes, if the single do such a survey does directly to save more, but do you know, as long as there are compiled this class DLL, no matter how you change the page, change the data structure, you can in 15 minutes you need to make the public opinion survey? This is the biggest difference between the two programming methods. Hopefully you can learn some programming ideas from this example.
