1.html <HTML> <HEAD> <title>Weather</title> <meta content="Microsoft Visual Studio .NET 7.1" name="GENERATOR"> <meta content="C#" name="CODE_LANGUAGE"> <meta content="JavaScript" name="vs_defaultClientScript"> <meta content="http://schemas.microsoft.com/intellisense/ie5" name="vs_targetSchema"> </HEAD> <body MS_POSITIONING="GridLayout"> <form id="Form1" method="post" runat="server"> <TABLE id="Table1" style="Z-INDEX: 110; LEFT: 296px; WIDTH: 320px; POSITION: absolute; TOP: 24px; HEIGHT: 231px" cellSpacing="1" cellPadding="1" width="320" bgColor="#ffff99" border="1"> <TR> <TD><asp:label id="Label1" runat="server" Font-Italic="True">==天气预报==</asp:label></TD> <TD><asp:dropdownlist id="ddlcity" runat="server"> <asp:ListItem Value="深圳" Selected="True">深圳</asp:ListItem> <asp:ListItem Value="广州">广州</asp:ListItem> <asp:ListItem Value="上海">上海</asp:ListItem> <asp:ListItem Value="北京">北京</asp:ListItem> <asp:ListItem Value="天津">天津</asp:ListItem> <asp:ListItem Value="武汉">武汉</asp:ListItem> <asp:ListItem Value="重庆">重庆</asp:ListItem> <asp:ListItem Value="成都">成都</asp:ListItem> <asp:ListItem Value="南京">南京</asp:ListItem> <asp:ListItem Value="香港">香港</asp:ListItem> <asp:ListItem Value="澳门">澳门</asp:ListItem> </asp:dropdownlist></TD> <TD><asp:button id="Button1" runat="server" Text="读取"></asp:button></TD> </TR> <TR> <TD colSpan="3"><asp:label id="l_city" runat="server"></asp:label></TD> </TR> <TR> <TD colSpan="3"><asp:label id="l_wea" runat="server"></asp:label></TD> </TR> <TR> <TD colSpan="3"><asp:label id="l_sky" runat="server"></asp:label></TD> </TR> <TR> <TD colSpan="3"><asp:label id="l_date" runat="server"></asp:label></TD> </TR> <TR> <TD colSpan="3"><asp:label id="l_w1" runat="server"></asp:label></TD> </TR> <TR> <TD colSpan="3"><asp:label id="l_w2" runat="server"></asp:label></TD> </TR> <TR> <TD colSpan="3"><asp:label id="l_w3" runat="server"></asp:label></TD> </TR> <TR> <TD colSpan="3"><asp:label id="l_w4" runat="server"></asp:label></TD> </TR> </TABLE> </form> </body></HTML> 2.cs添加如下应用 using System.Net;using System.IO; 页面代码 public class Weather : System.Web.UI.Page { protected System.Web.UI.WebControls.Label l_date; protected System.Web.UI.WebControls.Label l_city; protected System.Web.UI.WebControls.Label l_wea; protected System.Web.UI.WebControls.Label l_sky; protected System.Web.UI.WebControls.Label l_w1; protected System.Web.UI.WebControls.Label l_w2; protected System.Web.UI.WebControls.Button Button1; protected System.Web.UI.WebControls.Label Label1; protected System.Web.UI.WebControls.Label l_w3; protected System.Web.UI.WebControls.Label l_w4; protected System.Web.UI.WebControls.DropDownList ddlcity; private void Page_Load(object sender, System.EventArgs e) { if (!Page.IsPostBack) { writeWeatherInfo(ddlcity.SelectedValue); writeWeather(ddlcity.SelectedValue); } } getWeatherByCity 通过城市过虑#region getWeatherByCity 通过城市过虑 public string getWeatherByCity(string city) { string temp = null; try { string strURL = "http://weather.news.sina.com.cn/cgi-bin/figureWeather/search.cgi"; HttpWebRequest request= (HttpWebRequest)WebRequest.Create(strURL);//使用 WebRequest.Create 方法初始化 HttpWebRequest 的一个新实例。如果 URI 的方案是 http:// 或 https://,则 Create 将返回 HttpWebRequest 实例。 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 = 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 = (HttpWebResponse)request.GetResponse(); //获得响应流 Stream 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); start = HTML.IndexOf("<table border=0 cellpadding=0 cellspacing=0 style=/"margin:5px;/">",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; } #endregion writeWeatherInfo 显示处理后的信息#region writeWeatherInfo 显示处理后的信息 private void writeWeatherInfo(string city) { int start,stop; string weather1,weather2,wea; string wea_city = getWeatherByCity(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;//城市 l_wea.Text = "[天气]:" + weather1;//天气 l_sky.Text = "[温度]:" + weather2;//温度 l_date.Text = wall[0];//日期 l_w1.Text = wall[1];//风向 l_w2.Text = wall[2];//风力 l_w3.Text = wall[3]; //空气质量 l_w4.Text = wall[4]; //紫外线强度 } #endregion writeWeather 直接显示读取到的信息#region writeWeather 直接显示读取到的信息 private void writeWeather(string city) { string wea_city = getWeatherByCity(city); Response.Write(wea_city); } #endregion Button1_Click#region Button1_Click private void Button1_Click(object sender, System.EventArgs e) { writeWeatherInfo(ddlcity.SelectedValue); writeWeather(ddlcity.SelectedValue); } #endregion Web Form Designer generated code#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.Button1.Click += new System.EventHandler(this.Button1_Click); this.Load += new System.EventHandler(this.Page_Load); } #endregion }