技术资料 > .Net专区 > Asp.Net开发 : 关于webcontrol和pagelet的一点看法

关于webcontrol和pagelet的一点看法

March 25,2004

昨天看了bigeagle的一些帖子，觉得受益匪浅，但有一点我不是很同意，就是说pagelet是一个过渡性方案，其实在一些简单的控件开发上，pagelet是很方便的。
而且Pagelet有直观明了的特点。Pagelet 可与WebForm一样支持控件拖放。这极大方便了我们的编程。我个人认为简单的无需支持模版的空件完全可以用Pagelet来开发。它与WebControl是同等的。当然如果要做一个商业化的复杂的（比如你想自己做一个类似Datagrid的控件）还是要用WebControl的。这里就两个例子来说明
我们分别用这两种方式开发一个用户登录控件
1._Signin.ascx
<%@ Control Inherits="Portal.PortalModuleControl" %>
<%@ Import Namespace="Portal" %>
<script language="C#" runat="server">

void LoginBtn_Click(Object sender, ImageClickEventArgs e) {

      // Attempt to Validate User Credentials using UsersDB
      UsersDB accountSystem = new UsersDB();
      String userId = accountSystem.Login(email.Text, password.Text);

      if ((userId != null) && (userId != "")) {

         // Use security system to set the UserID within a client-side Cookie
         CookieAuthentication.SetAuthCookie(userId, RememberCheckbox.Checked);

         // Redirect browser back to originating page
         Response.Redirect("default.aspx");
      }
      else {
         Message.Text = "<" + "br" + "><" + "br" + ">登录失败!<" + "br" + "><" + "br>";
      }
}

</script>

<hr noshade size="1pt" width="98%">

<span class="SubSubHead" style="height:20">Account Login</span>

<br>

<span class="Normal">Email:</span><br>

<asp:TextBox id="email" columns="9" width="130" cssclass="NormalTextBox" runat="server"/><br>

<span class="Normal">Password:</span><br>

<asp:TextBox id="password" columns="9" width="130" textmode="password" cssclass="NormalTextBox" runat="server"/><br>

<asp:checkbox id="RememberCheckbox" class="Normal" Text="Remember Login" runat=server/>

<table cellspacing=0 cellpadding=4 border=0>

<tr>
      <td>
         <asp:ImageButton id=SigninBtn ImageUrl="images/signin.gif" OnClick="LoginBtn_Click" runat="server" /><br>
         <a href="register.aspx"><img src="images/register.gif" border="0"></a></br>

         <asp:label id="Message" class="NormalRed" runat=server/>
      </td>
</tr>

</table>

<br>

////
////2.WebControl
///
using System;
using System.Drawing;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.ComponentModel;
using System.Web.SessionState;
using System.Web.Security;
using Portal;
namespace Portal.Web
{
/// <summary>
/// Summary description for Login.
/// </summary>
[DefaultProperty("Text"),
      ShowInToolbox(true),
      ToolboxData("<{0}:Login runat=server></{0}:Login>")]
public class Login : Control, INamingContainer
{
      private string text;
      protected TextBox txtUserName;
      protected TextBox txtPassword;
      protected Label lblUserName;
      protected Label lblPassword;
      protected RequiredFieldValidator RVUserName;
      protected RequiredFieldValidator RVPassword;
      protected LinkButton btnLogin;
      protected LinkButton btnRegister;
      protected Label ErrMsg;
      protected CheckBox RememberCheckbox;

      [Bindable(true),
         Category("Appearance"),
         DefaultValue(""),
         Persistable(PersistableSupport.Declarative)]
      public string Text
      {
         get
         {
            return text;
         }

         set
         {
            text = value;
         }
      }

      /// <summary>
      /// Render this control to the output parameter specified.
      /// </summary>
      /// <param name="output"> The HTML writer to write out to </param>
      protected override void CreateChildControls()
      {
         this.Controls.Add(new LiteralControl("<Table>"));
         this.Controls.Add(new LiteralControl("<Tr>"));
         this.Controls.Add(new LiteralControl("<Td>"));
         lblUserName = new Label();
         lblUserName.Text = "用户名";
         this.Controls.Add(lblUserName);
         this.Controls.Add(new LiteralControl("</Td>"));
         this.Controls.Add(new LiteralControl("<Td>"));
         txtUserName = new TextBox();
         txtUserName.Text = "";
         this.Controls.Add(txtUserName);
         this.Controls.Add(new LiteralControl("</Td>"));
         this.Controls.Add(new LiteralControl("<Td>"));
         RVUserName = new RequiredFieldValidator();
         RVUserName.ControlToValidate = "txtUserName";
         RVUserName.ErrorMessage = "用户名不能为空！";
         RVUserName.ForeColor = System.Drawing.Color.Red;
         this.Controls.Add(RVUserName);
         this.Controls.Add(new LiteralControl("</Td>"));
         this.Controls.Add(new LiteralControl("</Tr>"));
         this.Controls.Add(new LiteralControl("<Tr>"));
         this.Controls.Add(new LiteralControl("<Td>"));
         lblPassword = new Label();
         lblPassword.Text = "密码";
         this.Controls.Add(lblPassword);
         this.Controls.Add(new LiteralControl("</Td>"));
         this.Controls.Add(new LiteralControl("<Td>"));
         txtPassword = new TextBox();
         txtPassword.TextMode = System.Web.UI.WebControls.TextBoxMode.Password;
         txtPassword.Text = "";
         this.Controls.Add(txtPassword);
         this.Controls.Add(new LiteralControl("</Td>"));
         this.Controls.Add(new LiteralControl("<Td>"));
         RVPassword = new RequiredFieldValidator();
         RVPassword.ControlToValidate = "txtPassword";
         RVPassword.ErrorMessage = "密码不能为空！！";
         RVPassword.ForeColor = System.Drawing.Color.Red;
         this.Controls.Add(RVUserName);
         this.Controls.Add(new LiteralControl("</Td>"));
         this.Controls.Add(new LiteralControl("</Tr>"));
         this.Controls.Add(new LiteralControl("<Tr colspan=3>"));
         this.Controls.Add(new LiteralControl("<Td>"));
         RememberCheckbox = new CheckBox();
         this.Controls.Add(RememberCheckbox);
         this.Controls.Add(new LiteralControl("</Td>"));
         this.Controls.Add(new LiteralControl("</Tr>"));
         this.Controls.Add(new LiteralControl("<Tr colspan=3>"));
         this.Controls.Add(new LiteralControl("<Td>"));
         btnLogin = new LinkButton();
         btnLogin.Text = "登录";
         btnLogin.Click += new EventHandler(this.btnLogin_Click);
         this.Controls.Add(btnLogin);
         this.Controls.Add(new LiteralControl("  "));
         btnRegister = new LinkButton();
         btnRegister.Text = "注册";
         btnRegister.Click += new EventHandler(this.btnRegister_Click);
         this.Controls.Add(btnLogin);
         this.Controls.Add(new LiteralControl("</Td>"));
         this.Controls.Add(new LiteralControl("</Tr>"));
         this.Controls.Add(new LiteralControl("<Tr colspan=3>"));
         this.Controls.Add(new LiteralControl("<Td>"));
         ErrMsg = new Label();
         ErrMsg.ID = "ErrMsg";
         this.Controls.Add(ErrMsg);
         this.Controls.Add(new LiteralControl("</Td>"));
         this.Controls.Add(new LiteralControl("</Tr>"));
         this.Controls.Add(new LiteralControl("</Table>"));
      }

      private void btnLogin_Click(Object sender, EventArgs e)
      {
         UsersDB accountSystem = new UsersDB();
         String userId = accountSystem.Login(txtUserName.Text, txtPassword.Text);
         if ((userId != null) && (userId != "")) {

         // Use security system to set the UserID within a client-side Cookie
         CookieAuthentication.SetAuthCookie(userId, RememberCheckbox.Checked);

         // Redirect browser back to originating page
         Page.Response.Redirect("default.aspx");
         }
         else {
         ErrMsg.Text = "<" + "br" + "><" + "br" + ">登录失败！<" + "br" + "><" + "br>";
         }
      }

      private void btnRegister_Click(Object sender, EventArgs e)
      {
         Page.Response.Redirect("register.aspx");
      }
}
}