用户控件ascx
<%@ Control Language="C#" AutoEventWireup="true" CodeBehind="249VoteControl.ascx.cs" Inherits="FirstWeb._249VoteControl1" %>
您对公司餐饮服务是否满意？
<asp:RadioButtonList ID="RadioButtonList1" runat="server">
<asp:ListItem Value="">非常满意</asp:ListItem>
<asp:ListItem Value="">比较满意</asp:ListItem>
<asp:ListItem Value="">一般</asp:ListItem>
</asp:RadioButtonList>
<asp:Button ID="Button1" runat="server" Text="我要投票" onclick="Button1_Click" />
<asp:Button ID="Button2" runat="server" Text="查看结果" onclick="Button2_Click" />
控件后台代码ascx.cs
/// <summary>
/// 将投票数量写入文件，然后读取出来显示投票结果
/// </summary>
public partial class _249VoteControl1 : System.Web.UI.UserControl
{
public static int readCount(String fielPath)
{
int count = ;
StreamReader sr = File.OpenText(fielPath) ;
while (sr.Peek() != -)
{
count =int.Parse( sr.ReadLine().ToString());
}
sr.Close();
return count;
} public static void addCount(String filePath)
{
int count = readCount(filePath);
StreamWriter sw = new StreamWriter(filePath,false);
count = count + ;
sw.WriteLine(count);
sw.Close(); } protected void Button1_Click(object sender, EventArgs e)
{
String userIp = Request.UserHostAddress.ToString();
HttpCookie oldCookie = Request.Cookies["ipCookie"];
if (oldCookie == null)
{
int flag = RadioButtonList1.SelectedIndex;//---
switch (flag)
{
case : addCount(Server.MapPath("Vote1.txt")); break;
case : addCount(Server.MapPath("Vote2.txt")); break;
case : addCount(Server.MapPath("Vote3.txt")); break;
}
Page.ClientScript.RegisterStartupScript(this.GetType(),"","alert('投票成功，感谢您的参与');",true);
HttpCookie newCookie = new HttpCookie("ipCookie");
newCookie.Values.Add("Ip", userIp);
newCookie.Expires = DateTime.Now.AddSeconds();//Cookie 的过期时间设置为当前时间之后5秒
Response.AppendCookie(newCookie); //---
}
else
{
if (oldCookie.Values["Ip"].ToString().Trim() == userIp.Trim())
{
Page.ClientScript.RegisterStartupScript(this.GetType(), "", "alert('同一个IP只能投票一次');", true);
} int flag = RadioButtonList1.SelectedIndex; //---
switch (flag)
{
case : addCount(Server.MapPath("Vote1.txt")); break;
case : addCount(Server.MapPath("Vote2.txt")); break;
case : addCount(Server.MapPath("Vote3.txt")); break;
}
Page.ClientScript.RegisterStartupScript(this.GetType(), "", "alert('投票成功，感谢您的参与');", true);
HttpCookie newCookie = new HttpCookie("ipCookie");
newCookie.Values.Add("Ip", userIp);
newCookie.Expires = DateTime.Now.AddSeconds();//Cookie 的过期时间设置为当前时间之后5秒
Response.AppendCookie(newCookie); //---
}
} protected void Button2_Click(object sender, EventArgs e)
{
Response.Write("<script>window.open('249VoteResult.aspx','','height=500,width=600');</script>");
}
引用控件的页面aspx
<%@ Register Src="~/249VoteControl.ascx" TagName="VoteControl" TagPrefix="uc3" %>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<uc3:VoteControl runat="server">//对投票控件的应用
</uc3:VoteControl>
</div>
</form>
</body>
投票结果页面
VoteResult.aspx
<body>
<form id="form1" runat="server">
<div>
<table id="myTable" border="" cellpadding="" cellspacing="" runat="server" style="" >
<h2>查看投票结果</h2> <tr><td>序号</td>
<td>投票意见</td>
<td>票数</td>
<td>百分比</td>
</tr>
<tr><td></td>
<td>非常满意</td>
<td><%=vote1%></td>
<td><%=vote1percent%> % </td>
</tr>
<tr><td></td>
<td>比较满意</td>
<td><%=vote2%></td>
<td><%=vote2percent%> % </td>
</tr>
<tr><td></td>
<td>一般</td>
<td><%=vote3%></td>
<td><%=vote3percent%> % </td>
</tr>
</table>
<h3>参与投票人数共<%=count%></h3>
</div>
</form>
</body>
VoteResult.aspx.cs
public int vote1;
public int vote2;
public int vote3;
public String vote1percent;
public String vote2percent;
public String vote3percent;
public int count;
public static int readCount(String fielPath)
{
int count = ;
StreamReader sr = File.OpenText(fielPath);
while (sr.Peek() != -)
{
count = int.Parse(sr.ReadLine().ToString());
}
sr.Close();
return count;
} protected void Page_Load(object sender, EventArgs e)
{
vote1 = readCount(Server.MapPath("Vote1.txt"));
vote2 = readCount(Server.MapPath("Vote2.txt"));
vote3 = readCount(Server.MapPath("Vote3.txt"));
count=vote1+vote2+vote3;
vote1percent = (Convert.ToDouble(vote1) * / Convert.ToDouble(count)).ToString("0.00"); //将double型转换为string型。并保留2位小数点
vote2percent = (Convert.ToDouble(vote2) * / Convert.ToDouble(count)).ToString("0.00"); //将double型转换为string型。并保留2位小数点
vote3percent = (Convert.ToDouble(vote3) * / Convert.ToDouble(count)).ToString("0.00"); //将double型转换为string型。并保留2位小数点 }
总结：
【1】对控件的引用<%@ Register Src="~/249VoteControl.ascx" TagName="VoteControl" TagPrefix="uc3" %>
<uc3:VoteControl runat="server">
</uc3:VoteControl>
【2】关于文件的读写
StreamReader sr = File.OpenText(fielPath) ;
while (sr.Peek() != -1)
{
count =int.Parse( sr.ReadLine().ToString());
}
StreamWriter sw = new StreamWriter(filePath,false);
sw.WriteLine(count);
【3】疑惑： Page.ClientScript.RegisterStartupScript(this.GetType(), "", "alert('同一个IP只能投票一次');", true);
【4】关于查看投票的结果百分比问题
将double型转换为string型。并保留2位小数点
vote1percent = (Convert.ToDouble(vote1) * 100 / Convert.ToDouble(count)).ToString("0.00");
【5】最后发点牢骚---困扰程序运行的都是一些小的细节，以前老师总说：现在偷得懒以后总要还的，
现在真的被一些基础的细节问题扰的崩溃。写代码需要沉下心，再沉下心，忌心浮气躁。