用C#读取sina天气预报到wap页面

 
页面代码：
＜%@ Register TagPrefix="mobile" Namespace="System.Web.UI.MobileControls" Assembly="System.Web.Mobile" %＞＜%@ Page language="c#" Codebehind="weather.aspx.cs" Inherits="goodwap.life.weather" AutoEventWireup="false" %＞＜mobile:form id="Form1" runat="server"＞
＜FONT face="宋体"＞
＜mobile:Label id="Label3" runat="server" Font-Bold="True"＞【生活资讯】＜/mobile:Label＞
＜mobile:Label id="Label1" runat="server" Font-Italic="True"＞==天气预报==＜/mobile:Label＞
＜mobile:Label id="l_date" runat="server"＞＜/mobile:Label＞
＜mobile:Label id="l_city" runat="server"＞＜/mobile:Label＞
＜mobile:Label id="l_wea" runat="server"＞＜/mobile:Label＞
＜mobile:Label id="l_sky" runat="server"＞＜/mobile:Label＞
＜mobile:Label id="l_w1" runat="server"＞＜/mobile:Label＞
＜mobile:Label id="l_w2" runat="server"＞＜/mobile:Label＞
＜mobile:Label id="l_w3" runat="server"＞＜/mobile:Label＞
＜mobile:Label id="Label2" runat="server"＞【请选择城市名】：＜/mobile:Label＞
＜mobile:SelectionList id="s_weather" runat="server"＞
＜Item Value="深圳" Text="深圳" Selected="True"＞＜/Item＞
＜Item Value="广州" Text="广州"＞＜/Item＞
＜Item Value="上海" Text="上海"＞＜/Item＞
＜Item Value="北京" Text="北京"＞＜/Item＞
＜Item Value="天津" Text="天津"＞＜/Item＞
＜Item Value="武汉" Text="武汉"＞＜/Item＞
＜Item Value="重庆" Text="重庆"＞＜/Item＞
＜Item Value="成都" Text="成都"＞＜/Item＞
＜Item Value="南京" Text="南京"＞＜/Item＞
＜Item Value="香港" Text="香港"＞＜/Item＞
＜Item Value="澳门" Text="澳门"＞＜/Item＞
＜/mobile:SelectionList＞
＜mobile:Command id="Command1" runat="server"＞查 询＜/mobile:Command＞
＜mobile:Link id="Link1" runat="server" NavigateUrl="../default.aspx#Goodview"＞首 页＜/mobile:Link＞＜/FONT＞＜/mobile:form＞

public class weather : System.Web.UI.MobileControls.MobilePage
{
protected System.Web.UI.MobileControls.Label Label1;
protected System.Web.UI.MobileControls.Label Label2;
protected System.Web.UI.MobileControls.SelectionList s_weather;
protected System.Web.UI.MobileControls.Label l_date;
protected System.Web.UI.MobileControls.Label l_city;
protected System.Web.UI.MobileControls.Label l_wea;
protected System.Web.UI.MobileControls.Label l_sky;
protected System.Web.UI.MobileControls.Label l_w1;
protected System.Web.UI.MobileControls.Label l_w2;
protected System.Web.UI.MobileControls.Label l_w3;
protected System.Web.UI.MobileControls.Link Link1;
protected System.Web.UI.MobileControls.Command Command1;
protected System.Web.UI.MobileControls.Label Label3;
protected System.Web.UI.MobileControls.Form Form1;

private void Page_Load(object sender, System.EventArgs e)
{
// 在此处放置用户代码以初始化页面
if (!Page.IsPostBack)
{
string city = "深圳";
int start,stop;
string weather1,weather2,wea;
string wea_city = weather_city(city);
wea_city = wea_city.Replace(" ","");

start = wea_city.IndexOf("<b>",0,wea_city.Length);
stop = wea_city.IndexOf("</b>", start);
weather1 = wea_city.Substring(start, stop-start).Trim() + " ";
weather1 = weather1.Substring(3,8).Trim();

start = wea_city.IndexOf("<tdstyle=\"font-size:40px;font-family:TimesNewRoman;font-weight:bold;\">",0,wea_city.Length);
stop = wea_city.IndexOf("℃",start) + 40;
weather2 = wea_city.Substring(start, stop-start);
weather2 = weather2.Substring(stop-start-42,40).Trim();
weather2 = weather2.Replace("\t","");

start = wea_city.IndexOf("<fontcolor=#183888><b>", 0, wea_city.Length);
stop = wea_city.IndexOf("</b></font>",start);
wea = wea_city.Substring(start,stop-start);
wea = wea.Substring(22,wea.Length-22) + "kbrk";
wea = wea.Replace("\t", "");
wea = wea.Replace(">", "k");
wea = wea.Replace("<", "k");
wea = wea.Replace("kbrk", "k");
string [] wall = null;
char[] seperator = {'k'};
wall = wea.Split(seperator);

//////////////////////////////////////
l_city.Text = "[城市]：" + city;
l_wea.Text = "[天气]：" + weather1;
l_sky.Text = "[温度]：" + weather2;
///////
l_date.Text = wall[0];
l_w1.Text = wall[1];
l_w2.Text = wall[2];
l_w3.Text = wall[3];
}
}

#region Web 窗体设计器生成的代码
override protected void OnInit(EventArgs e)
{
//
// CODEGEN: 该调用是 ASP.NET Web 窗体设计器所必需的。
//
InitializeComponent();
base.OnInit(e);
}

/// <summary>
/// 设计器支持所需的方法 - 不要使用代码编辑器修改
/// 此方法的内容。
/// </summary>
private void InitializeComponent()
{
this.Command1.Click += new System.EventHandler(this.Command1_Click);
this.Load += new System.EventHandler(this.Page_Load);

}
#endregion

private void Command1_Click(object sender, System.EventArgs e)
{
string city = s_weather.Selection.Value.Trim();
int start,stop;
string weather1,weather2,wea;
string wea_city = weather_city(city);
wea_city = wea_city.Replace(" ","");

start = wea_city.IndexOf("<b>",0,wea_city.Length);
stop = wea_city.IndexOf("</b>", start);
weather1 = wea_city.Substring(start, stop-start).Trim() + " ";
weather1 = weather1.Substring(3,8).Trim();

start = wea_city.IndexOf("<tdstyle=\"font-size:40px;font-family:TimesNewRoman;font-weight:bold;\">",0,wea_city.Length);
stop = wea_city.IndexOf("℃",start) + 40;
weather2 = wea_city.Substring(start, stop-start);
weather2 = weather2.Substring(stop-start-42,40).Trim();
weather2 = weather2.Replace("\t","");

start = wea_city.IndexOf("<fontcolor=#183888><b>", 0, wea_city.Length);
stop = wea_city.IndexOf("</b></font>",start);
wea = wea_city.Substring(start,stop-start);
wea = wea.Substring(22,wea.Length-22) + "kbrk";
wea = wea.Replace("\t", "");
wea = wea.Replace(">", "k");
wea = wea.Replace("<", "k");
wea = wea.Replace("kbrk", "k");
string [] wall = null;
char[] seperator = {'k'};
wall = wea.Split(seperator);

//////////////////////////////////////
l_city.Text = "[城市]：" + city;
l_wea.Text = "[天气]：" + weather1;
l_sky.Text = "[温度]：" + weather2;
///////
l_date.Text = wall[0];
l_w1.Text = wall[1];
l_w2.Text = wall[2];
l_w3.Text = wall[3];
}

public string weather_city(string city)
{
string temp = null;
try
{
string strURL = "http://weather.news.sina.com.cn/cgi-bin/figureWeather/search.cgi";
HttpWebRequest request;
request = (HttpWebRequest)WebRequest.Create(strURL);
request.Method="POST"; //Post请求方式
request.ContentType="application/x-www-form-urlencoded"; //内容类型
string paraUrlCoded = System.Web.HttpUtility.UrlEncode("city"); //参数经过URL编码
paraUrlCoded = paraUrlCoded + "=" + System.Web.HttpUtility.UrlEncode(city, System.Text.Encoding.GetEncoding("GB2312"));
byte[] payload;
payload = System.Text.Encoding.GetEncoding("GB2312").GetBytes(paraUrlCoded); //将URL编码后的字符串转化为字节
request.ContentLength = payload.Length; //设置请求的ContentLength
Stream writer = request.GetRequestStream(); //获得请求流
writer.Write(payload,0,payload.Length); //将请求参数写入流
writer.Close(); //关闭请求流
HttpWebResponse response;
response = (HttpWebResponse)request.GetResponse(); //获得响应流
Stream s;
s = response.GetResponseStream();
StreamReader objReader = new StreamReader(s,System.Text.Encoding.GetEncoding("GB2312"));
string HTML = "";
string sLine = "";
int i = 0;
while (sLine!=null)
{
i++;
sLine = objReader.ReadLine();
if (sLine!=null)
HTML += sLine;
}
HTML = HTML.Replace("<","<");
HTML = HTML.Replace(">",">");
int start,stop;
start = HTML.IndexOf("<img src=\"http://image2.sina.com.cn/dy/weather/images/figure/",0,HTML.Length);
stop = HTML.IndexOf("<td background=http://image2.sina.com.cn/dy/weather/images",start);
temp = HTML.Substring(start, stop - start);
}
catch (Exception x)
{
}
return temp;
}
}