ASP.NET的实时天气及24小时天气预报

2024-07-10 13:12:23

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收集最实用的网页特效代码！

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

以下为引用的内容：
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">
   <font face="宋体">
   <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");

   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("<table border=0 cellpadding=2 cellspacing=1 bgcolor=9999cc width=/"85%/">",0,html.length);

   stop = html.indexof("</table>",start)+8;


   temp = html.substring(start, stop - start);
   weather2.text = temp;
   }
   }
}

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