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>添加如下应用
using System.Net;using System.IO;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 writeWeatherInfo 显示处理后的信息 writeWeather 直接显示读取到的信息 Button1_Click Web Form Designer generated code 
}