asp.net高级教程(五)-实战篇(中)

2/8/2001来源:ASP教程人气:16160

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>&nbsp;

    <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='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='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='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。