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

GetWeather.aspx

-----------------------------------

<%@ 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>

</HEAD>

<body>

<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>

getWeather.aspx.cs

---------------------------------------

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;

namespace test

{

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;

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 ASP.NET Web Form Designer.

InitializeComponent();

base.OnInit(e);

}

/// <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);

}

#endregion

private void btnGet_Click(object sender, System.EventArgs e)

{

WebRequest wreq=WebRequest.Create("http://weather.yahoo.com/forecast/CHXX0037_c.html");

HttpWebResponse wresp=(HttpWebResponse)wreq.GetResponse();

string HTML ="";

Stream s=wresp.GetResponseStream();

StreamReader objReader = new StreamReader(s);

string sLine = "";

int i = 0;

while (sLine!=null)

{

i++;

sLine = objReader.ReadLine();

if (sLine!=null)

HTML += sLine;

}

String temp= "";

int start,stop;

start = HTML.IndexOf("",0,HTML.Length);

stop = HTML.IndexOf("",0,HTML.Length);

temp = HTML.Substring(start, stop - start);

start = temp.IndexOf("<b>");

stop = temp.IndexOf("</b>");

string degree = temp.Substring(start+3,stop - start -3);

start = temp.IndexOf("<img");

stop = temp.IndexOf("</td>",start);

string img = temp.Substring(start,stop - start);

lblWeather.Text = degree + "<br>" + img;

}

private void btnGet2_Click(object sender, System.EventArgs e)

{

WebRequest wreq=WebRequest.Create("http://cn.weather.yahoo.com/CHXX/CHXX0037/index_c.html");