ASP.NET中的多重表单[翻译]
作者:Sanjay Kumar 2006-6-5
译者:SPARON2006-6-7
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 method="post" runat="server">
<table cellSpacing="0" cellPadding="0" width="95%" >
<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" runat="server" NAME="txtFName"></td>
<td width="25%">Last Name</td>
<td width="25%"><input class="inputformat" type="text" runat="server" NAME="txtLName"></td>
</tr>
<tr class="rowStyle">
<td></td>
<td colspan="2" align="center"><asp:Button CssClass="buttonStyle" 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%" >
<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>");
}
#region Web Form Designer generated code
override protected void OnInit(EventArgs e)
{
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.Load += new System.EventHandler(this.Page_Load);
}
#endregion
}
}
[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 here
Response.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>");
}
#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.Load += new System.EventHandler(this.Page_Load);
}
#endregion
}
}