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
GetWeather.a x
-----------------------------------
<%@ Page language="c#" Codebehind="GetWeather.a x.c quot; AutoEventWireup="false" Inherits="test.GetWeather" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Tra itional//E quot; >
<HTML>
<HEAD>
<title>GetWeather</title>
<meta name="GENERATOR" Content="Microsoft Visual Studio 7.0" gt;
<meta name="CODE_LANGUAGE" Content="C#" gt;
<meta name="vs_defaultClientScript" content="JavaScript" gt;
<meta name="vs_targetSchema" content="http://schemas.microsoft.com/intellise e/ie5" gt;
</HEAD>
< ody>
<form id="GetWeather" method=" ost" runat=" erver" gt;
<FONT face="宋体" gt;
< gt;
<a :Label id="lblWeather" runat=" erver" gt;Weather</a :Label> lt;/ gt;
< gt;
<a :Button id=" tnGet" runat=" erver" Text="Get Weather" gt lt;/a :Butto gt lt;/ gt;
< gt;
<a :Label id="Weather2" runat=" erver" gt;24小时天气</a :Label> lt;/ gt;
< gt;
<a :Button id=" tnGet2" runat=" erver" Text="天气预报" gt lt;/a :Butto gt lt;/ gt;
</FONT>
</form>
</body>
</HTML>
getWeather.a x.cs
---------------------------------------
using System;
using System.Collectio
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.We
using System.Web.Se io tate;
using System.Web.UI;
using System.Web.UI.WebControl
using System.Web.UI.HtmlControl
using System.Net;
using System.IO;
name ace test
{
public cla 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;
private void Page_Load(object sender, System.EventArgs e)
{
// Put user code to initialize the page here
}
#region Web Form Designer generated code
override protected void OnInit(EventArgs e)
{
//
// CODEGEN: This call is required by the A .NET Web Form Designer.
//
InitializeComponent();
base.OnInit(e);
}
/// < ummary>
/// Required method for Designer su ort - 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);
}
#endregion
private void btnGet_Click(object sender, System.EventArgs e)
{
WebRequest wreq=WebRequest.Create("http://weather.yahoo.com/forecast/CHXX0037_c.html");
HttpWebRe o e wre =(HttpWebRe o e)wreq.GetRe o e();
string HTML =" quot
Stream s=wre .GetRe o eStream();
StreamReader objReader = new StreamReader(s);
string sLine = " quot
int i = 0;
while (sLine!=null)
{
i++;
sLine = objReader.ReadLine();
if (sLine!=null)
HTML += sLine;
}
String temp= " quot
int start,sto
start = HTML.IndexOf(" lt;!-- CURCON--> quot;,0,HTML.Length);
stop = HTML.IndexOf(" lt;!-- END CURCON--> quot;,0,HTML.Length);
temp = HTML.Su tring(start, stop - start);
start = temp.IndexOf(" lt gt quot;);
stop = temp.IndexOf(" lt;/ gt quot;);
string degree = temp.Su tring(start+3,stop - start -3);
start = temp.IndexOf(" lt;img");
stop = temp.IndexOf(" lt;/td> quot;,start);
string img = temp.Su tring(start,stop - start);
lblWeather.Text = degree + " lt r> quot; + img;
}
private void btnGet2_Click(object sender, System.EventArgs e)
{
WebRequest wreq=WebRequest.Create("http://cn.weather.yahoo.com/CHXX/CHXX0037/index_c.html");
HttpWebRe o e wre =(HttpWebRe o e)wreq.GetRe o e();
string HTML =" quot
Stream s=wre .GetRe o eStream();
StreamReader objReader = new StreamReader(s,System.Text.Encoding.GetEncoding("GB2312"));
string sLine = " quot
int i = 0;
while (sLine!=null)
{
i++;
sLine = objReader.ReadLine();
if (sLine!=null)
HTML += sLine;
}
String temp= " quot
int start,sto
start = HTML.IndexOf(" lt;table border=0 cellpadding=2 cell acing=1 bgcolor=9999cc width=\"85%\" gt quot;,0,HTML.Length);
stop = HTML.IndexOf(" lt;/table> quot;,start)+8;
temp = HTML.Su tring(start, stop - start);
Weather2.Text = tem
}
}
}