Timer.aspx
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Timer.aspx.cs" Inherits="Timer" %>
<%@ Register Assembly="System.Web.Extensions, Version=2.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"
Namespace="System.Web.UI" TagPrefix="asp" %>//这里也有疑问，Version=2.0.0.0是啥意思，要不要改成其他的，
<!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>未命名页面</title>
</head>
<body>
<form id="form1" runat="server">
<asp:ScriptManager ID="ScriptManager1" runat="server">
</asp:ScriptManager>
<asp:UpdatePanel ID="UpdatePanel1" runat="server"><ContentTemplate>
<asp:Label id="txtTime" runat="server" __designer:wfdid="w1"></asp:Label> //这里报错：错误 1 无法识别的标记前缀或设备筛选器“__designer”。
//警告 2 验证 (ASP.Net): 属性“wfdid”不是元素“Label”的有效属性。
</ContentTemplate>
</asp:UpdatePanel>
<asp:Timer ID="Timer1" runat="server" Interval="1000" OnTick="Timer1_Tick">
</asp:Timer>
</form>
</body>
</html>
timer.aspx.cs
using System;
using System.Data;
using System.Configuration;
using System.Collections;
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.Drawing;
public partial class Timer : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void Timer1_Tick(object sender, EventArgs e)
{
Label txtTime = (Label)UpdatePanel1.FindControl("txtTime");
txtTime.Text = "服务器现在时间是：" + DateTime.Now.ToLongTimeString();
int red = new Random().Next(255);
System.Threading.Thread.Sleep(100); //暂停100毫秒
int green = new Random().Next(255);
System.Threading.Thread.Sleep(100);
int blue = new Random().Next(255);
txtTime.BackColor = Color.FromArgb(red, green, blue);
txtTime.ForeColor = Color.FromArgb(green, blue, red);
}
}
maiyude
