我们下面就要接触如何写Server控件。编写Server控件并不是一件轻松容易的事情，需要对.Net平台有比较深的了解，适合于高级用户，因此这里本人也不会具体描述Server控件的编写步骤(要细细讲这个，非得写书不可)。请大家比较一下自定义控件源代码与用户控件的区别,作一些大致的了解：
using System;
using System.Data;
using System.Data.SqlClient;
using System.Drawing;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
namespace aspcn
{
//首先是Header
public class Header:Control,INamingContainer
{
private AdRotator ad;
private Label lblAdText;
protected override void CreateChildControls()
{
//加入AdRotator广告控件
ad = new AdRotator();
ad.AdvertisementFile = "AdBanners/ad.xml";
ad.BorderWidth = 0;
ad.AdCreated = new AdCreatedEventHandler(this.OnAdCreated);
this.Controls.Add(ad);
this.Controls.Add(new LiteralControl("
" "当前广告链接为："));
//加入Label控件
lblAdText = new Label();
lblAdText.ForeColor = Color.Red;
this.Controls.Add(lblAdText);
}
private void OnAdCreated(Object sender,AdCreatedEventArgs e)
{
this.lblAdText.Text = e.AlternateText;
}
}
//接着是Logon
public class Logon : Control,INamingContainer
{
private string strConnString = "server=(local)\\Feidao;database=aspcn;Trusted_Connection=yes";
private Label lblMsgShow;
private TextBox tbUserName,tbPasswd;
public String UserName
{
get
{
return tbUserName.Text;
}
set
{
tbUserName.Text = value;
}
}
protected override void CreateChildControls()
{
//添加HTML标签
this.Controls.Add(new LiteralControl("
| 登陆窗口 | |
| ")); //添加MsgShow Label控件 lblMsgShow = new Label(); lblMsgShow.ForeColor = Color.Red; this.Controls.Add(lblMsgShow); this.Controls.Add(new LiteralControl(" | |
| 用户名： | ")); //添加UserName与Passwd TextBox控件 tbUserName = new TextBox(); this.Controls.Add(tbUserName); this.Controls.Add(new LiteralControl(" |
| 密码： | ")); tbPasswd = new TextBox(); tbPasswd.TextMode = TextBoxMode.Password; this.Controls.Add(tbPasswd); this.Controls.Add(new LiteralControl(" |
| ")); //添加BtnSubmit Button控件 Button btnSubmit = new Button(); btnSubmit.Text = "登陆"; btnSubmit.Click = new EventHandler(this.Submit_Click); this.Controls.Add(btnSubmit); this.Controls.Add(new LiteralControl(" |
}
//显示完毕
private void Submit_Click(Object sender,EventArgs e)
{
SqlConnection MyConn = new SqlConnection(strConnString);
MyConn.Open();
string strUserName,strPassword,strSelect;
strUserName = tbUserName.Text;
strPassword = tbPasswd.Text;
strSelect = "select * from bbs_user where id='" strUserName "' and password='" strPassword "'";
SqlCommand MyComm = new SqlCommand(strSelect,MyConn);
SqlDataReader dr = MyComm.ExecuteReader();
if(dr.Read())
{
//登陆成功
this.lblMsgShow.Text = "登陆成功";
}
else
{
//登陆不成功
this.lblMsgShow.Text = "登陆不成功";
}
dr.Close();
MyConn.Close();
}
}
//最后是Footer
public class Footer : Control,INamingContainer
{
private string _UserName,_Purview;
public string UserName
{
get
{
return _UserName;
}
set
{
_UserName = value;
}
}
public string Purview
{
get
{
return _Purview;
}
set
{
_Purview = value;
}
}
public Footer()
{
_UserName = "游客";
_Purview = "无";
}
protected override void CreateChildControls()
{
this.Controls.Add(new LiteralControl("用户名："));
Label lblUserName = new Label();
lblUserName.ForeColor = Color.Red;