Timer控件考试倒计时源码

前台：

<%@ Page Language="C#" AutoEventWireup="true"  CodeFile="Default.aspx.cs" Inherits="_Default" %>

<%@ Register Assembly="System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"
    Namespace="System.Web.UI" TagPrefix="asp" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>无标题页</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:ScriptManager ID="ScriptManager1" runat="server">
        </asp:ScriptManager>
        <asp:UpdatePanel ID="UpdatePanel1" runat="server"> 
        <ContentTemplate> 
         <asp:Timer ID="Timer1" runat="server" Interval="1000" ontick="Timer1_Tick">
        </asp:Timer>
        <asp:Label ID="lbtime" runat="server" Text="Label"></asp:Label>
        </ContentTemplate>
        </asp:UpdatePanel>
     
    </div>
    </form>
</body>
</html>

cs代码：

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Timers;
public partial class _Default : System.Web.UI.Page 
{
    int num = 0;
   
    protected void Page_Load(object sender, EventArgs e)
    {
        num = 10;
    }
    //触发Timer控件的Timer1_Tick事件实现考试倒计时功能
    protected void Timer1_Tick(object sender, EventArgs e)
    {
        this.index--;
         //考试时间到了
         if (this.index<= 0)
         {
             //设置Timer控件不可见
             this.Timer1.Enabled = false;
             this.lbtime.Text = this.index / 60 + "分" + this.index % 60 + "秒";

             ScriptManager.RegisterStartupScript(this.UpdatePanel1, this.GetType(), "updateScript", "alert('答题超时，请关闭本页面重新进入！');window.opener=null;window.open('','_self');window.close();", true);
          
         }
         else
         {
             //显示考试剩余时间
             this.lbtime.Text = this.index / 60 + "分" + this.index % 60 + "秒将停止考试，请及时“提交”试卷，否则试卷作费成绩无效！";
         }
    }
    /// <summary>
    /// 定义在线考试总时间变量index,
    /// 并设置读写属性
    /// </summary>
    private int index
    {
        get
        {
            object o = ViewState["index "];
            return (o == null) ? num : (int)o;
        }
        set
        {
            ViewState["index "] = value;
        }
    }
    
}

注意事项：web.config文件，必须加入以下代码：否则ajax失效：

 <httpHandlers>
      <add verb="GET,HEAD" path="ScriptResource.axd" type="System.Web.Handlers.ScriptResourceHandler, System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" validate="false"/>
     
    </httpHandlers>

 

 posted on 2012-10-08 10:00  纳米程序员  阅读(3371)  评论(0)  编辑  收藏  举报