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://www.okasp.com/techinfo/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://www.okasp.com/techinfo/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.okasp.com/techinfo/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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