asp.net的实时天气及24小时天气预报(c#) 修改其中的url获得其他城市的天气情况
如广州为：
http://weather.yahoo.com/forecast/chxx0037_c.html
注意仅适用于获得yahoo上的天气预报
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getweather.aspx
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<%@ page language=”c#” codebehind=”getweather.aspx.cs” autoeventwireup=”false” inherits=”test.getweather” %>
<!doctype html public “-//w3c//dtd html 4.0 transitional//en” >
<html>
<head>
<title>getweather</title>
<meta name=”generator” content=”microsoft visual studio 7.0″>
<meta name=”code_language” content=”c#”>
<meta name=”vs_defaultclientscript” content=”javascript”>
<meta name=”vs_targetschema” content=”http://schemas.microsoft.com/intellisense/ie5″>
</head>
<body>
<form id=”getweather” method=”post” runat=”server”>
<font face=”宋体”>
<p>
<asp:label id=”lblweather” runat=”server”>weather</asp:label></p>
<p>
<asp:button id=”btnget” runat=”server” text=”get weather”></asp:button></p>
<p>
<asp:label id=”weather2″ runat=”server”>24小时天气</asp:label></p>
<p>
<asp:button id=”btnget2″ runat=”server” text=”天气预报”></asp:button></p>
</font>
</form>
</body>
</html>
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getweather.aspx.cs
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using system;
using system.collections;
using system.componentmodel;
using system.data;
using system.drawing;
using system.web;
using system.web.sessionstate;
using system.web.ui;
using system.web.ui.webcontrols;
using system.web.ui.htmlcontrols;
using system.net;
using system.io;
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namespace test
{
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public class getweather : system.web.ui.page
{
protected system.web.ui.webcontrols.label lblweather;
protected system.web.ui.webcontrols.label weather2;
protected system.web.ui.webcontrols.button btnget2;
protected system.web.ui.webcontrols.button btnget;
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private void page_load(object sender, system.eventargs e)
{
// put user code to initialize the page here
}
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#region web form designer generated code
override protected void oninit(eventargs e)
{
//
// codegen: this call is required by the asp.net web form designer.
//
initializecomponent();
base.oninit(e);
}
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/// <summary>
/// required method for designer support – do not modify
/// the contents of this method with the code editor.
/// </summary>
private void initializecomponent()
{
this.btnget.click += new system.eventhandler(this.btnget_click);
this.btnget2.click += new system.eventhandler(this.btnget2_click);
this.load += new system.eventhandler(this.page_load);
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}
#endregion
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private void btnget_click(object sender, system.eventargs e)
{
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webrequest wreq=webrequest.create(“http://weather.yahoo.com/forecast/chxx0037_c.html”);
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httpwebresponse wresp=(httpwebresponse)wreq.getresponse();
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string html =”";
stream s=wresp.getresponsestream();
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streamreader objreader = new streamreader(s);
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string sline = “”;
int i = 0;
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while (sline!=null)
{
i++;
sline = objreader.readline();
if (sline!=null)
html += sline;
}
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string temp= “”;
int start,stop;
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start = html.indexof(“<!– curcon–>”,0,html.length);
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stop = html.indexof(“<!– end curcon–>”,0,html.length);
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temp = html.substring(start, stop – start);
start = temp.indexof(“<b>”);
stop = temp.indexof(“</b>”);
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string degree = temp.substring(start+3,stop – start -3);
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start = temp.indexof(“<img”);
stop = temp.indexof(“</td>”,start);
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string img = temp.substring(start,stop – start);
lblweather.text = degree + “<br>” + img;
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}
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private void btnget2_click(object sender, system.eventargs e)
{
webrequest wreq=webrequest.create(“http://cn.weather.yahoo.com/chxx/chxx0037/index_c.html”);
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httpwebresponse wresp=(httpwebresponse)wreq.getresponse();
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string html =”";
stream s=wresp.getresponsestream();
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streamreader objreader = new streamreader(s,system.text.encoding.getencoding(“gb2312″));
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string sline = “”;
int i = 0;
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while (sline!=null)
{
i++;
sline = objreader.readline();
if (sline!=null)
html += sline;
}
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string temp= “”;
int start,stop;
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start = html.indexof(“<table border=0 cellpadding=2 cellspacing=1 bgcolor=9999cc width=\\”85%\\”>”,0,html.length);
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stop = html.indexof(“</table>”,start)+8;
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temp = html.substring(start, stop – start);
weather2.text = temp;
}
}
}