ASP.NET的实时天气及24小时天气预报(C#)

2008-02-22 09:26:52来源：互联网阅读 ()

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;

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