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asp.net服务器推送长连接

2015-08-27 22:24 543 查看

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm1.aspx.cs" Inherits="WebApplication18.WebForm1" %>

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">

<title>Asp. Server Push</title>
<script src="jquery-1.8.1.min.js"></script>
<script type="text/javascript">

function Change(str) {

window.document.getElementById("div1").innerText = str;

}

</script>
<script type="text/javascript">
$(function () {

var iframe = document.createElement("iframe");
iframe.width = 0;
iframe.height = 0;
iframe.src = 'Default.aspx';
$("#ceshi").html(iframe);

});
</script>
</head>

<body>

<div id="ceshi" style="display:none"></div>
<div style=" float:left">现在时间是：</div>

<div id="div1"></div>

</body>

</html>

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

namespace WebApplication18
{
public partial class Default : System.Web.UI.Page
{

protected void Page_Load(object sender, EventArgs e)
{

}

protected override void Render(HtmlTextWriter output)
{

string str;

while (true)
{//死循环保持长链接

str = "<script >window.parent.Change('" + DateTime.Now.ToLongTimeString() + "')</script>";

HttpContext.Current. Response.Write(str);

HttpContext.Current.Response.Flush();//输脚本调用出

}

}

}
}

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