ASP.net高级教程（五）---实战篇（结合论坛用户操作谈ASP.net表单验证)（中)
www.goodsgy.com
做好准备工作，现在就要动真格的了，先让我们看看用户注册的实现。前边已经讲过，ASP.net可以实现业务逻辑和HTML代码分离，那么让我们来看看到底是如何实现的，下面这个文件是用户注册的页面部分，原型是根据我站点的风格制作的：www.goodsgy.com
<%@Page language="c#" Codebehind="Register.cs" AutoEventWireup="false" Inherits="bbs.Register" %>
<%@Register Tagprefix="My" Namespace="bbs.uctrl"%>
<HTML><head>
<TITLE>新用户注册</TITLE>
<meta name=vs_targetSchema content="HTML 4.0">
<link rel="stylesheet" href=http://www.blue1000.com/article/"images/style.CSS">
<META http-equiv=Content-Type content="text/HTML; charset=gb2312">
<meta name="GENERATOR" Content="Microsoft Visual Studio 7.0">
<meta name="CODE_LANGUAGE" Content="C#"></head>
<script language=JavaScript>
function OnPreview()
{
divPreview.innerHTML = Form1.txtSignature.value ;
}
</script>
<body>
<form method="post" runat="server" ID=Form1> www.goodsgy.com
<My:MyHead id="myHead1" runat="server"></MY:MYHEAD>www.goodsgy.com
<!----------------------外面表格形成边框-------------------------------------->
<table width='722' border='0' cellspacing=0
cellpadding='0' align='center'>
<TBODY>
<tr>
<!-------------------左边竖线---------------------------------------------->
<td bgcolor='#0097c0' width='1'>
<img src=http://www.blue1000.com/article/'images/Shim.gif' width=1>
</td>
<td width=720 align=middle><br><br><br>
<!-------------------左边竖线---------------------------------------------->www.goodsgy.com
www.goodsgy.com
<!--------------新用户注册开始---------------------------------------------->
<table width=600 align=center border=0 cellpadding=4 cellspacing=1
id="tblRegister" class=cn bgcolor=#000000 runat=server>
<TBODY>
<tr bgcolor=#ffffff>
<td colspan=3>
<p align=center>新用户注册</p>
</td>
</tr>
<!--------------用户名开始-------------------------------------------------------->
<tr bgcolor=#ffffff>
<td width=60>
用户名
</td>
<td width=300>
<ASP:TextBox id="txtUserName" maxlength=20 columns=20 runat="server"></ASP:TextBox>
<font color=red>*</font>
</td>
<td width=240>
用户笔名，4-20字符
<ASP:requiredfieldvalidator id="reqUserName" display=Dynamic
controltovalidate="txtUserName" runat=Server>
不能为空！
</ASP:requiredfieldvalidator>
<ASP:regularexpressionvalidator id="regUserName" display=Dynamic
controltovalidate="txtUserName" runat=Server validationexpression="[^']{4,20}">
用户名非法！
</ASP:regularexpressionvalidator>
<ASP:customvalidator id="cusUserName" controltovalidate="txtUserName"
onservervalidate="ValidUser" display=Dynamic runat=Server>
该用户已存在。
</ASP:customvalidator>
</td>
</tr>
<!--------------用户名结束-------------------------------------------------------->www.goodsgy.com
<!--------------用户密码开始-------------------------------------------------------->
<tr bgcolor=#ffffff>
<td width=60>
密码
</td>
<td width=300>
<ASP:TextBox id="txtPassword" maxlength=10 columns=10
textmode=Password runat=server></ASP:TextBox>
<font color=red>*</font>
</td>
<td width=240>
用户密码，4-10字符
<ASP:requiredfieldvalidator id=Requiredfieldvalidator1 display=Dynamic
controltovalidate="txtPassword" runat=Server>
不能为空！
</ASP:requiredfieldvalidator>
<ASP:regularexpressionvalidator id=Regularexpressionvalidator1 display=Dynamic
controltovalidate="txtPassword" runat=Server validationexpression="[^']{4,10}">
密码非法！
</ASP:regularexpressionvalidator>
</td>
</tr>
<!--------------用户密码结束-------------------------------------------------------->
<!--------------验证密码开始-------------------------------------------------------->
<tr bgcolor=#ffffff>
<td width=60>
验证密码
</td>
<td width=300>
<ASP:TextBox id=txtPassword1 maxlength=10 columns=10
textmode=Password runat=server></ASP:TextBox>
<font color=red>*</font>
</td>
<td width=240>
再次输入密码。
<ASP:comparevalidator id="comPassword" display=Dynamic
controltocompare="txtPassword" controltovalidate="txtPassword1" runat=Server>
两次录入的密码不同！
</ASP:comparevalidator>
</td>
</tr>
<!--------------验证密码结束-------------------------------------------------------->www.goodsgy.com
<!--------------email开始-------------------------------------------------------->
<tr bgcolor=#ffffff>
<td width=60>
Email
</td>
<td width=300>
<ASP:TextBox id="txtEmail" maxlength=100 columns=30 runat=server></ASP:TextBox>
</td>
<td width=240>
您的电子邮件地址，您可以不填，但请不要胡填。
<ASP:regularexpressionvalidator id="regEmail" display=Dynamic
controltovalidate="txtEmail" validationexpression="[^']*" runat=Server>
非法字符
</ASP:regularexpressionvalidator>
</td>
</tr>
<!--------------email结束-------------------------------------------------------->www.goodsgy.com
<!--------------个人主页开始-------------------------------------------------------->
<tr bgcolor=#ffffff>
<td width=60>
个人主页
</td>
<td width=300>
<ASP:TextBox id="txtHomepage" maxlength=150 columns=30 runat=server></ASP:TextBox>
</td>
<td width=240>
您的主页，您可以不填，但请不要胡填。
<ASP:regularexpressionvalidator id="regHomepage" display=Dynamic
controltovalidate="txtHomepage" validationexpression="[^']*" runat=Server>
非法字符。
</ASP:regularexpressionvalidator>
</td>
</tr>
<!--------------个人主页结束-------------------------------------------------------->www.goodsgy.com
<!--------------签名开始-------------------------------------------------------->
<tr bgcolor=#ffffff>
<td width=60>
签名
</td>
<td width=300>
<ASP:TextBox id="txtSignature" maxlength=150 columns=30 rows=6 textmode=MultiLine runat=server></ASP:TextBox>
</td>
<td width=240 valign=top>
<div id="divPreview">
你可以制作自己的签名，不超过255个字符，不能用script。<br><br>
</div><br>
<input type=button id="btnPreview" value="预览" onclick="OnPreview()"><br>
<ASP:regularexpressionvalidator id=Regularexpressionvalidator2 display=Dynamic
controltovalidate="txtSignature" validationexpression="[^']{0,255}" runat=Server>
使用非法字符或超过255个字符。
</ASP:regularexpressionvalidator>
</td>
</tr>
<!--------------签名结束-------------------------------------------------------->
<tr bgcolor=#ffffff>
<td colspan=3 align=center>
<ASP:button id="btnSubmit" text="确认" onclick="OnSubmit" runat=Server></ASP:button>
</td>
</tr>
</table><br><br><br>
<!----------------------------------新用户注册结束---------------------->www.goodsgy.com
<!-------------------右边竖线---------------------------------------------->
<td bgcolor='#0097c0' width='1'>
<img src=http://www.blue1000.com/article/'images/Shim.gif' width=1>
</td>
<!-------------------右边竖线---------------------------------------------->
</tr>
<!-------------------下边横线---------------------------------------------->
<tr>
<td colspan=3 height=1 bgcolor=#0097c0><img src=http://www.blue1000.com/article/'images/shim.gif'width=1 height=1></td>
</tr>
<!-------------------下边横线---------------------------------------------->
</table>www.goodsgy.com
<My:bottom id="myBottom" runat="server"></My:bottom>
</form>
</BODY></HTML>www.goodsgy.com
<!--------------------文件结束--------------------------------->www.goodsgy.com
怎么样，看上去很熟悉吧，除了页首两句及下面webform中带runat=server的webcontrol，是不是和普通的HTML一样？注意到页首第一句中的Codebehind="Register.cs"吗，它指定本页后面的代码文件是register.cs，这是ASP.net提供的一种机制，它可以将业务逻辑隐藏在与.ASPx同名的cs文件中，而运行时先把这个cs文件编译，这样不但可以提高运行效率，也使代码隐藏起来，避免了ASP中由于系统漏洞而造成源码泄漏所造成的问题。那么，这个包含业务逻辑的代码文件是怎样的呢？下面是这个文件：
namespace bbs
{
using System;
using System.Collections;
using System.ComponentModel;
using System.Data.SQL;
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 bbs.uctrl ;
//using bbs.MyClass ;
using MyOwnClass ;www.goodsgy.com
/// <summary>
/// Summary description for Register.
/// </summary>
public class Register : System.Web.UI.Page
{
protected System.Web.UI.WebControls.Button btnSubmit;
protected System.Web.UI.WebControls.TextBox txtHomepage;
protected System.Web.UI.WebControls.TextBox txtEmail;
protected System.Web.UI.WebControls.CompareValidator comPassword;
protected System.Web.UI.WebControls.TextBox txtPassword1;
protected System.Web.UI.WebControls.RegularExpressionValidator Regularexpressionvalidator1;
protected System.Web.UI.WebControls.RequiredFieldValidator Requiredfieldvalidator1;
protected System.Web.UI.WebControls.TextBox txtPassword;
protected System.Web.UI.WebControls.CustomValidator cusUserName;
protected System.Web.UI.WebControls.RegularExpressionValidator regUserName;
protected System.Web.UI.WebControls.RequiredFieldValidator reqUserName;
protected System.Web.UI.WebControls.Label lblMessage;
protected System.Web.UI.WebControls.TextBox txtUserName;
public MyHead myHead1 ;www.goodsgy.com
//构造函数
public Register()
{
Page.Init += new System.EventHandler(Page_Init);
}www.goodsgy.com
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
//
// Evals true first time browser hits the page
//
}
}www.goodsgy.com
protected void Page_Init(object sender, EventArgs e)
{
//
// CODEGEN: This call is required by the ASP+ Windows Form Designer.
//
InitializeComponent();
this.myHead1.Position = 2 ;
}www.goodsgy.com
/// <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);
}www.goodsgy.com
//监测用户是否存在
public bool ValidUser(Object sender , string value)
{
BBSUser myUser = new BBSUser() ;
bool bExists ;
try
{
bExists = myUser.GetUser(this.txtUserName.Text) ;
}
catch(Exception e) //如果出现异常
{
#if DEBUG
Response.Write (e.Message) ;
return false ;
#endif
Server.Transfer("error.ASPx") ;
}
return !bExists ;
}www.goodsgy.com
//提交按钮点击
public void OnSubmit(Object sender , EventArgs e)
{
if (Page.IsValid)
{
//数据入库
try
{
BBSUser myUser = new BBSUser() ;
if(!myUser.GetUser(txtUserName.Text))
{
myUser.CreateUser(BBSUser.CreateType.Create , txtUserName.Text , txtPassword.Text ,
txtEmail.Text , txtHomepage.Text , "") ;
}
}
catch(Exception exp)
{
#if DEBUG
Response.Write ("出现异常：" + exp.Message) ;
return ;
#endif//DEBUG
Server.Transfer("error.ASPx") ;
}
}
}www.goodsgy.com
}www.goodsgy.com
}www.goodsgy.com
什么？还是看着眼熟？没错，是不是和前边我定义的那个类差不多？是，本来ASP.net就是把这个页当作一个对象，注意类定义的那行代码：public class Register : System.Web.UI.Page ， 前面你可以理解，是定义一个Register对象，那:号后面的System.Web.UI.Page是什么意思呢？它说明这个Regsiter类是System.Web.UI.Page类的派生类（子类），也就是说Register类除了自己成员变量、属性、方法外，还继承System.Web.UI.Page类的所有公共(public)或保护(protected)成员变量、属性和方法。明白了这些，你可以安心坐下来研究代码了，做好下面关于表单验证内容的学习准备。www.goodsgy.com
.text:''):(d.getSelection?d.getSelection():'');void(keyit=window.open('http://my.poco.cn/fav/storeIt.php?t='+escape(d.title)+'&u='+escape(d.location.href)+'&c='+escape(t)+'&img=http://www.h-strong.com/blog/logo.gif','keyit','scrollbars=no,width=475,height=575,status=no,resizable=yes'));keyit.focus();){kind=link}