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asp.net高級(jí)圖文詳細(xì)教程(5)-實(shí)戰(zhàn)篇(中)

[摘要]asp.net高級(jí)教程(五)---實(shí)戰(zhàn)篇(結(jié)合論壇用戶操作談asp.net表單驗(yàn)證)(中) 做好準(zhǔn)備工作,現(xiàn)在就要?jiǎng)诱娓竦牧耍茸屛覀兛纯从脩糇?cè)的實(shí)現(xiàn)。前邊已經(jīng)講過(guò),asp.net可以實(shí)現(xiàn)業(yè)務(wù)...
asp.net高級(jí)教程(五)---實(shí)戰(zhàn)篇(結(jié)合論壇用戶操作談asp.net表單驗(yàn)證)(中)

   做好準(zhǔn)備工作,現(xiàn)在就要?jiǎng)诱娓竦牧,先讓我們看看用戶注?cè)的實(shí)現(xiàn)。前邊已經(jīng)講過(guò),asp.net可以實(shí)現(xiàn)業(yè)務(wù)邏輯和html代碼分離,那么讓我們來(lái)看看到底是如何實(shí)現(xiàn)的,下面這個(gè)文件是用戶注冊(cè)的頁(yè)面部分,原型是根據(jù)我站點(diǎn)的風(fēng)格制作的:

<%@Page language="c#" Codebehind="Register.cs" AutoEventWireup="false" Inherits="bbs.Register" %>
<%@Register Tagprefix="My" Namespace="bbs.uctrl"%>
<html><head>
<TITLE>新用戶注冊(cè)</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>

<!----------------------外面表格形成邊框-------------------------------------->
<table width='722' border='0' cellspacing=0
   cellpadding='0' align='center'>
  <TBODY>
   <tr>
   <!-------------------左邊豎線---------------------------------------------->
     <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>
   <!-------------------左邊豎線---------------------------------------------->



<!--------------新用戶注冊(cè)開始---------------------------------------------->    
    <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>新用戶注冊(cè)</p>
            </td>
        </tr>
        <!--------------用戶名開始-------------------------------------------------------->
        <tr bgcolor=#ffffff>
            <td width=60>
                用戶名
            </td>
            <td width=300>
                <asp:TextBox id="txtUserName" maxlength=20 columns=20 runat="server"></asp:TextBox>
                <font color=red>*</font>
            </td>
            <td width=240>
                用戶筆名,4-20字符
                <asp:requiredfieldvalidator id="reqUserName" display=Dynamic
                    controltovalidate="txtUserName" runat=Server>
                    不能為空!
                </asp:requiredfieldvalidator>
                <asp:regularexpressionvalidator id="regUserName" display=Dynamic
                    controltovalidate="txtUserName" runat=Server validationexpression="[^']{4,20}">
                    用戶名非法!
                </asp:regularexpressionvalidator>                        
                <asp:customvalidator id="cusUserName" controltovalidate="txtUserName"
                    onservervalidate="ValidUser" display=Dynamic runat=Server>
                    該用戶已存在。
                </asp:customvalidator>                
            </td>
        </tr>
        <!--------------用戶名結(jié)束-------------------------------------------------------->

        <!--------------用戶密碼開始-------------------------------------------------------->
        <tr bgcolor=#ffffff>
            <td width=60>
                密碼
            </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>
                用戶密碼,4-10字符
                <asp:requiredfieldvalidator id=Requiredfieldvalidator1 display=Dynamic
                    controltovalidate="txtPassword" runat=Server>
                    不能為空!
                </asp:requiredfieldvalidator>
                <asp:regularexpressionvalidator id=Regularexpressionvalidator1 display=Dynamic
                    controltovalidate="txtPassword" runat=Server validationexpression="[^']{4,10}">
                    密碼非法!
                </asp:regularexpressionvalidator>                                        
            </td>
        </tr>
        <!--------------用戶密碼結(jié)束-------------------------------------------------------->
        
        <!--------------驗(yàn)證密碼開始-------------------------------------------------------->
        <tr bgcolor=#ffffff>
            <td width=60>
                驗(yàn)證密碼
            </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>
                再次輸入密碼。
                <asp:comparevalidator id="comPassword" display=Dynamic
                 controltocompare="txtPassword" controltovalidate="txtPassword1" runat=Server>
                    兩次錄入的密碼不同!
                </asp:comparevalidator>
            </td>
        </tr>
        <!--------------驗(yàn)證密碼結(jié)束-------------------------------------------------------->

        <!--------------email開始-------------------------------------------------------->
        <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>
                您的電子郵件地址,您可以不填,但請(qǐng)不要胡填。
                <asp:regularexpressionvalidator id="regEmail" display=Dynamic
                    controltovalidate="txtEmail" validationexpression="[^']*" runat=Server>
                    非法字符
                    </asp:regularexpressionvalidator>
            </td>
        </tr>
        <!--------------email結(jié)束-------------------------------------------------------->

        <!--------------個(gè)人主頁(yè)開始-------------------------------------------------------->
        <tr bgcolor=#ffffff>
            <td width=60>
                個(gè)人主頁(yè)
            </td>
            <td width=300>
                <asp:TextBox id="txtHomepage" maxlength=150 columns=30 runat=server></asp:TextBox>
            </td>
            <td width=240>
                您的主頁(yè),您可以不填,但請(qǐng)不要胡填。
                <asp:regularexpressionvalidator id="regHomepage" display=Dynamic
                    controltovalidate="txtHomepage" validationexpression="[^']*" runat=Server>
                非法字符。
                </asp:regularexpressionvalidator>
            </td>
        </tr>
        <!--------------個(gè)人主頁(yè)結(jié)束-------------------------------------------------------->

        <!--------------簽名開始-------------------------------------------------------->
        <tr bgcolor=#ffffff>
            <td width=60>
                簽名
            </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">
                你可以制作自己的簽名,不超過(guò)255個(gè)字符,不能用script。<br><br>
                </div><br>
                
                <input type=button id="btnPreview" value="預(yù)覽" onclick="OnPreview()"><br>
                <asp:regularexpressionvalidator id=Regularexpressionvalidator2 display=Dynamic
                    controltovalidate="txtSignature" validationexpression="[^']{0,255}" runat=Server>
                使用非法字符或超過(guò)255個(gè)字符。
                </asp:regularexpressionvalidator>
            </td>
        </tr>
        <!--------------簽名結(jié)束-------------------------------------------------------->
        
        <tr bgcolor=#ffffff>
            <td colspan=3 align=center>
                <asp:button id="btnSubmit" text="確認(rèn)"  onclick="OnSubmit" runat=Server></asp:button>
            </td>
        </tr>
    </table><br><br><br>
<!----------------------------------新用戶注冊(cè)結(jié)束---------------------->

   <!-------------------右邊豎線---------------------------------------------->
     <td bgcolor='#0097c0' width='1'>
       <img src='http://www.okasp.com/techinfo/images/Shim.gif' width=1>
      </td>
   <!-------------------右邊豎線---------------------------------------------->
    </tr>
    
    <!-------------------下邊橫線---------------------------------------------->
    <tr>
     <td colspan=3 height=1 bgcolor=#0097c0><img src='http://www.okasp.com/techinfo/images/Shim.gif'width=1 height=1></td>    
    </tr>
    <!-------------------下邊橫線---------------------------------------------->
</table>

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

<!--------------------文件結(jié)束--------------------------------->

    怎么樣,看上去很熟悉吧,除了頁(yè)首兩句及下面webform中帶runat=server的webcontrol,是不是和普通的html一樣?注意到頁(yè)首第一句中的Codebehind="Register.cs"嗎,它指定本頁(yè)后面的代碼文件是register.cs,這是asp.net提供的一種機(jī)制,它可以將業(yè)務(wù)邏輯隱藏在與.aspx同名的cs文件中,而運(yùn)行時(shí)先把這個(gè)cs文件編譯,這樣不但可以提高運(yùn)行效率,也使代碼隱藏起來(lái),避免了asp中由于系統(tǒng)漏洞而造成源碼泄漏所造成的問(wèn)題。那么,這個(gè)包含業(yè)務(wù)邏輯的代碼文件是怎樣的呢?下面是這個(gè)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 ;

        //構(gòu)造函數(shù)
        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);
        }

        //監(jiān)測(cè)用戶是否存在
        public bool ValidUser(Object sender , string value)
        {
            BBSUser myUser = new BBSUser() ;
            bool bExists ;
            try
            {
                bExists = myUser.GetUser(this.txtUserName.Text) ;            
            }
            catch(Exception e)        //如果出現(xiàn)異常
            {
#if DEBUG
                Response.Write (e.Message) ;
                return false ;
#endif
                Server.Transfer("error.aspx") ;
                
            }    
                
            return !bExists ;            
        }

        //提交按鈕點(diǎn)擊
        public void OnSubmit(Object sender , EventArgs e)
        {
            if (Page.IsValid)
            {
                //數(shù)據(jù)入庫(kù)
                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 ("出現(xiàn)異常:" + exp.Message) ;
                    return ;
#endif//DEBUG
                    Server.Transfer("error.aspx") ;
                }
            }
        }

                    
    }

}

   什么?還是看著眼熟?沒(méi)錯(cuò),是不是和前邊我定義的那個(gè)類差不多?是,本來(lái)asp.net就是把這個(gè)頁(yè)當(dāng)作一個(gè)對(duì)象,注意類定義的那行代碼:public class Register : System.Web.UI.Page , 前面你可以理解,是定義一個(gè)Register對(duì)象,那:號(hào)后面的System.Web.UI.Page是什么意思呢?它說(shuō)明這個(gè)Regsiter類是System.Web.UI.Page類的派生類(子類),也就是說(shuō)Register類除了自己成員變量、屬性、方法外,還繼承System.Web.UI.Page類的所有公共(public)或保護(hù)(protected)成員變量、屬性和方法。明白了這些,你可以安心坐下來(lái)研究代碼了,做好下面關(guān)于表單驗(yàn)證內(nèi)容的學(xué)習(xí)準(zhǔn)備。