关于webcontrol和pagelet的一点看法

作者： unknow

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");
        }
    }
}

返回顶部

下一篇：关于.net的几个重要问题的bigeagle版本 >>