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。  
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