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ASP.NET的实时天气及24小时天气预报(C#)

作者：采集员文章来源：来源于网络点击数：更新时间：2005/9/10 14:20:21

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>
 <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">
 
 
 <asp:Label id="lblWeather" runat="server">Weather</asp:Label>
 
 <asp:Button id="btnGet" runat="server" Text="Get Weather"></asp:Button>
 
 <asp:Label id="Weather2" runat="server">24小时天气</asp:Label>
 
 <asp:Button id="btnGet2" runat="server" Text="天气预报"></asp:Button>
 
 </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("");
 stop = temp.IndexOf("");

 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 + " " + img;

 }

        private void btnGet2_Click(object sender, System.EventArgs e)
        {
            WebRequest wreq=WebRequest.Create("http://cn.weather.yahoo.com/CHXX/CHXX0037/index_c.html");
&n

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