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asp.net高级图文详细教程(5)---实战篇(中)

技术开发2024-06-15 阅读()
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)

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:

<%@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="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>

<My:MyHead id="myHead1" runat="server"></MY:MYHEAD>

<!----------------------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://edu.chinaz.com/Get/Program/Net/images/Shim.gif' width=1>
</td>
<td width=720 align=middle><br><br><br>
<!-------------------左边竖线---------------------------------------------->

<!--------------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-------------------------------------------------------->

<!--------------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-------------------------------------------------------->

<!--------------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-------------------------------------------------------->

<!--------------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-------------------------------------------------------->

<!--------------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---------------------->

<!-------------------右边竖线---------------------------------------------->
<td bgcolor='#0097c0' width='1'>
<img src='http://edu.chinaz.com/Get/Program/Net/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://edu.chinaz.com/Get/Program/Net/images/Shim.gif'width=1 height=1></td>
</tr>
<!-------------------下边横线---------------------------------------------->
</table>

<My:bottom id="myBottom" runat="server"></My:bottom>
</form>
</BODY></HTML>

<!--------------------文件结束--------------------------------->

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 ;

/// <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 ;

//构造函数
public Register()
{
Page.Init += new System.EventHandler(Page_Init);
}

protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
//
// Evals true first time browser hits the page
//
}
}

protected void Page_Init(object sender, EventArgs e)
{
//
// CODEGEN: This call is required by the ASP+ Windows Form Designer.
//
InitializeComponent();
this.myHead1.Position = 2 ;
}

/// <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);
}

//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 ;
}

//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") ;
}
}
}


}

}

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。




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