webform1.aspx
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm1.aspx.cs" Inherits="test17_5.WebForm1" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:ScriptManager ID="ScriptManager1" runat="server"></asp:ScriptManager>
<asp:Timer ID="Timer1" runat="server" Interval="10000" OnTick="Timer1_Tick"></asp:Timer>
<asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Conditional">
<Triggers>
<asp:AsyncPostBackTrigger ControlID="Timer1"/>
</Triggers>
<ContentTemplate>
汇率:1美元 兑换 人民币 <asp:Label ID="StockPrice" runat="server" Text=""></asp:Label><br />
时间:<asp:Label ID="TimeOfPrice" runat="server" Text=""></asp:Label><br />
</ContentTemplate>
</asp:UpdatePanel>
<div>
<br />刷新频率:<br /><br />
<asp:RadioButton ID="RadioButton1" runat="server" GroupName="timer" AutoPostBack="true" Text="2秒" OnCheckedChanged="RadioButton1_CheckedChanged"/><br />
<asp:RadioButton ID="RadioButton2" runat="server" GroupName="timer" AutoPostBack="true" Text="20秒" OnCheckedChanged="RadioButton2_CheckedChanged"/><br />
<asp:RadioButton ID="RadioButton3" runat="server" GroupName="timer" AutoPostBack="true" Text="不刷新" OnCheckedChanged="RadioButton3_CheckedChanged" /><br />
<br />
页面最后更新时间:
<asp:Label ID="OriginalTime" runat="server" Text=""></asp:Label>
</div>
</div>
</form>
</body>
</html>
webform1.aspx.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
namespace test17_5
{
public partial class WebForm1 : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
this.OriginalTime.Text = DateTime.Now.ToLongTimeString();
}
protected void Timer1_Tick(object sender, EventArgs e)
{
this.StockPrice.Text = GetStockPrice();
TimeOfPrice.Text = DateTime.Now.ToLongTimeString();
}
private string GetStockPrice()
{
double randomStockPrice = 6.7 + new Random().NextDouble();
return randomStockPrice.ToString("C");
}
protected void RadioButton1_CheckedChanged(object sender, EventArgs e)
{
Timer1.Enabled = true;
Timer1.Interval = 2000;
}
protected void RadioButton2_CheckedChanged(object sender, EventArgs e)
{
Timer1.Enabled = true;
Timer1.Interval = 20000;
}
protected void RadioButton3_CheckedChanged(object sender, EventArgs e)
{
Timer1.Enabled = false;
}
}
}