asp.net高级教程(五)-实战篇(中)

  •   2009-07-27/22:09
  • 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。



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