复合登录控件

• 下载源代码文件 - 18 Kb
• 下载演示项目 - 59 Kb

引言

本文档展示了复合服务器控件的实现。创建此控件的目的是创建一个在网站中常用登录控件。   复合控件使用子控件来实现其功能。它包含 Label 控件以显示文本，TextBox 控件以获取用户的值，以及 RequiredFieldValidator 控件以验证用户输入的数据。它还包含一个 Button 控件以将数据提交到服务器。

"userTextBox" 用于获取“用户名”的值，"passTextBox" 用于获取“密码”的值，其 TextMode 设置为“密码”。最后，一个按钮控件用于提交数据。

技术实现

Comp.cs (类库)

using System;
using System.ComponentModel;
using System.Drawing;
using System.Security.Permissions;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

namespace Controls
{
public class comp : CompositeControl
{
#region private control variables
private Label userLabel;
private Label passLabel;
private Button submitButton;
private TextBox userTextBox;
private TextBox passTextBox;
private RequiredFieldValidator userValidator;
private static readonly object EventSubmitKey = new object();
#endregion

#region Public Attributes
public string userName
{
get
{
EnsureChildControls();
return userTextBox.Text;
}
set
{
EnsureChildControls();
userTextBox.Text = value;
}
}
public string Password
{
get
{
EnsureChildControls();
return passTextBox.Text;
}
set
{
EnsureChildControls();
passTextBox.Text = value;
}
}
[Category("Action"),Description("Fires when user click on the Submit Button")]
public event EventHandler Submit
{
add
{
Events.AddHandler(EventSubmitKey, value);
}
remove
{
Events.RemoveHandler(EventSubmitKey, value);
}
}
#endregion

#region Button Events
protected virtual void OnSubmit(EventArgs e)
{
EventHandler SubmitHandler = (EventHandler)Events[EventSubmitKey];
if (SubmitHandler != null)
{
SubmitHandler(this, e);
}
}

private void _button_Click(object source, EventArgs e)
{
OnSubmit(EventArgs.Empty);
}
#endregion

#region override CreateChildControls/Render Methods
protected override void CreateChildControls()
{
Controls.Clear();
userLabel = new Label();
userLabel.Text = "User Name";
userTextBox = new TextBox();
userTextBox.ID = "nameTextBox";
userValidator = new RequiredFieldValidator();
userValidator.ID = "validator1";
userValidator.ControlToValidate = userTextBox.ID;
userValidator.ErrorMessage = "*";
userValidator.Display = ValidatorDisplay.Static;
passLabel = new Label();
passLabel.Text = "Password";
passTextBox = new TextBox();
passTextBox.ID = "passTextBox";
passTextBox.TextMode = TextBoxMode.Password;
submitButton = new Button();
submitButton.ID = "button1";
submitButton.Text = "Login";
submitButton.Click += new EventHandler(_button_Click);
this.Controls.Add(userLabel);
this.Controls.Add(userTextBox);
this.Controls.Add(passTextBox);
this.Controls.Add(userValidator);
this.Controls.Add(passLabel);
this.Controls.Add(submitButton);
}

protected override void Render(HtmlTextWriter writer)
{
AddAttributesToRender(writer);
writer.AddAttribute(HtmlTextWriterAttribute.Cellpadding,"1", false);
writer.RenderBeginTag(HtmlTextWriterTag.Table);
writer.RenderBeginTag(HtmlTextWriterTag.Tr);
writer.RenderBeginTag(HtmlTextWriterTag.Td);
userLabel.RenderControl(writer);
writer.RenderEndTag();
writer.RenderBeginTag(HtmlTextWriterTag.Td);
userTextBox.RenderControl(writer);
writer.RenderEndTag();
writer.RenderBeginTag(HtmlTextWriterTag.Td);
userValidator.RenderControl(writer);
writer.RenderEndTag();
writer.RenderEndTag();
writer.RenderBeginTag(HtmlTextWriterTag.Tr);
writer.RenderBeginTag(HtmlTextWriterTag.Td);
passLabel.RenderControl(writer);
writer.RenderEndTag();
writer.RenderBeginTag(HtmlTextWriterTag.Td);
passTextBox.RenderControl(writer);
writer.RenderEndTag();
writer.RenderEndTag();
writer.RenderBeginTag(HtmlTextWriterTag.Tr);
writer.AddAttribute(HtmlTextWriterAttribute.Colspan,"2", false);
writer.AddAttribute(HtmlTextWriterAttribute.Align,"right", false);
writer.RenderBeginTag(HtmlTextWriterTag.Td);
submitButton.RenderControl(writer);
writer.RenderEndTag();
writer.RenderBeginTag(HtmlTextWriterTag.Td);
writer.Write(" ");
writer.RenderEndTag();
writer.RenderEndTag();
writer.RenderEndTag();
}
}
#endregion

#region public class
// This class inherits from System.Web.UI.WebControls.WebControl and implements interface INamingContainer
public class CompositeControl : System.Web.UI.WebControls.WebControl, INamingContainer
{ 
}
#endregion
}

现在，您需要构建上述类库并将其引用添加到您的 Web 应用程序。

只需插入注册标签即可

<%@ Register TagPrefix="vik" Namespace="Controls" Assembly="Control" %>
<vik:comp runat="server" id="Comp1"></vik:comp>

private void Comp1_Submit(object sender, System.EventArgs e)
{
Response.Write(Comp1.userName);
Response.Write(Comp1.Password);
}