作者: Sanjay Kumar 2006-6-5
译者: SPARON 2006-6-7
这篇文章将教我们怎么使用ASP.NET中的多重表单
URL：
http://www.c-sharpcorner.com/UploadFile/avi_sanjay/MultiForms.htm06042006062957AM/MultiForms.htm.aspx
ASP.NET依赖SFI(Single Form Interface:单接口)而不是MFI(Multi Form Interface:多重接口),因为SFI在ASP.NET通常状态下是一个元素. 因此,如果你有两个或两个以上的Form表单的话,在你提交的时候会出现”一个页面只能有一个表单”的错误,在ASP.NET中表单是由HtmlForm派生的,这个类不提供常见的行为属性,也不支持事物属性.
当页面提交时，页面对象被处理并呈递第一个服务器端运行的Form，同时将其内置的flag标志写入日志，页面中其它的服务器端运行的Form将会被抛出一个HttpException异常。
不过你可以插入多个没有"runat =server"属性的Form标记.示范代码如下:
1. 如何在你的ASPX文件中插入多个Form并且提交到另一页面.
2. 如何在提交页面检索从Form控件传来的值.
[Main.aspx]: 在这个页面里有两个Form表单,一个是服务器端运行的表单,它传递的数据直接提交到本页面,另外一个表单是普通的HTML表单，它没有'runat=server'属性，它会将表单内的数据传递到另一个页面。嵌入该表单内的HTML控件需指定唯一地名称。
<%@ Page language="c#" Codebehind="Main.aspx.cs" AutoEventWireup="false" Inherits="MultipleForm.Main" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" ><HTML> <HEAD> <title>Main</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"> <link type="text/css" href="MyStyle.css" rel="stylesheet"> </HEAD> <body MS_POSITIONING="GridLayout"> <form id="frmMain" method="post" runat="server"> <table cellSpacing="0" cellPadding="0" width="95%" border="0"> <caption class="tblCaption">Post data to same page [ Main.aspx ]</caption> <tr class="rowStyle"> <td width="25%">First Name</td> <td width="25%"><input class="inputformat" type="text" id="txtFName" runat="server" NAME="txtFName"></td> <td width="25%">Last Name</td> <td width="25%"><input class="inputformat" type="text" id="txtLName" runat="server" NAME="txtLName"></td> </tr> <tr class="rowStyle"> <td></td> <td colspan="2" align="center"><asp:Button CssClass="buttonStyle" id="btnSubmit" runat="server" Text="Post to Main"></asp:Button></td> <td></td> </tr> </table> </form> <br> <!------ 此处是HTML表单，它将提交到另一个页面处理表单中的数据 //----------> <form action="A1.aspx" method="post"> <table cellSpacing="0" cellPadding="0" width="95%" border="0"> <caption class="tblCaption">Post data to another page [ A1.aspx ]</caption> <tr class="rowStyle"> <td width="25%">First Name</td> <td width="25%"><input class="inputformat" type="text" name="fname"></td> <td width="25%">Last Name</td> <td width="25%"><input class="inputformat" type="text" name="lname"></td> </tr> <tr class="rowStyle"> <td></td> <td colspan="2" align="center"><input class="buttonStyle" type="submit" value="Post to A1"></td> <td></td> </tr> </table> </form> </body></HTML>[Main.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; namespace MultipleForm{
/// <summary>/// Summary description for Main.
/// </summary>public class Main : System.Web.UI.Page{protected System.Web.UI.WebControls.Button btnSubmit;protected System.Web.UI.HtmlControls.HtmlInputText txtFName;protected System.Web.UI.HtmlControls.HtmlInputText txtLName;protected System.Web.UI.WebControls.TextBox txtfname;private void Page_Load(object sender, System.EventArgs e){// 获取数据并初始化Response.Write("<font>First Name : " + txtFName.Value + "<br>");Response.Write("Last Name : " + txtLName.Value + "</font><br>");} 
Web Form Designer generated code}
}
[A1.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.Collections.Specialized; /* The System.Collections.Specialized namespace has * NameValueCollection class which will be used to * retrieve(检索) form fields data by defined name * * 在命名空间System.Collections.Specialized下的* NameValueCollection类具有检索form表单字段功能 */ namespace MultipleForm{/// <summary>/// Summary description for A1./// </summary>public class A1 : System.Web.UI.Page{private void Page_Load(object sender, System.EventArgs e){// Put user code to initialize the page hereResponse.Write("<font>Data posted to A1.apsx page <br>");// 定义一个 NameValueCollection 类的对象NameValueCollection userdata;//将form请求赋给userdata对象//此时userdata就具有所有Form对象的控件值了userdata = Request.Form;//现在我们就可以预览Form对象中的所有值了Response.Write("First Name : " + userdata["fname"].ToString() + "<br>");Response.Write("Last Name : " + userdata["lname"].ToString() + "</font><br>");} Web Form Designer generated code}}