关于webcontrol和pagelet的一点看法
点击次数：23 次 发布日期：2008-11-27 01:11:29 作者：源代码网
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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="http://www.zzchn.com/edu/20070914/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"); } &nb  源代码网供稿. |
