ASP.NET的实时天气及24小时天气预报(C#)

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 
----------------------------------- 
Weather
24小时天气

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); 
}

/// 
/// Required method for Designer support - do not modify 
/// the contents of this method with the code editor. 
/// 
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("stop = temp.IndexOf("",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");

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

string HTML =""; 
Stream s=wresp.GetResponseStream(); 
StreamReader objReader = new StreamReader(s,System.Text.Encoding.GetEncoding("GB2312")); 
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(" ",start)+8; 
temp = HTML.Substring(start, stop - start); 
Weather2.Text = temp; 
} 
} 
}