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="0">非常满意</asp:ListItem> <asp:ListItem Value="1">比较满意</asp:ListItem> <asp:ListItem Value="2">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 = 0; StreamReader sr = File.OpenText(fielPath) ; while (sr.Peek() != -1) { 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 + 1; 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 0: addCount(Server.MapPath("Vote1.txt")); break; case 1: addCount(Server.MapPath("Vote2.txt")); break; case 2: 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(5);//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 0: addCount(Server.MapPath("Vote1.txt")); break; case 1: addCount(Server.MapPath("Vote2.txt")); break; case 2: 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(5);//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="1" cellpadding="5" cellspacing="0" 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>1</td>
<td>非常满意</td>
<td><%=vote1%></td>
<td><%=vote1percent%> % </td>
</tr>
<tr><td>2</td>
<td>比较满意</td>
<td><%=vote2%></td>
<td><%=vote2percent%> % </td>
</tr>
<tr><td>3</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 = 0; StreamReader sr = File.OpenText(fielPath); while (sr.Peek() != -1) { 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) * 100 / 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) * 100 / 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) * 100 / 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。