[原创]自定义分页控件(dll服务器控件)代码学习与探讨!

本控件提供的相关内容:

三个文件: 1.Pager.cs 2.WebForm.aspx 3 WebForm.aspx.cs

其中1为翻页控件. 2及3是用作测试的文档及源文件.

试用需要做的事: 1.根据提示转成相应的文件.及建立相关项目编译

2.根据数据库连接信息建立相应的数据库(TestDataBase)及数据表(News)

3.建立相对应的站点.

--------Pager.cs 服务器控件源文件----------------------------------------------------------------------------

using System;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.ComponentModel;

namespace C_Pager

{

public class Pager : Control, INamingContainer

{

[Description("操作员选择不同页时产生的页更新事件，通过此事件处理把旧页面显示信息更新到选择页对应的数据信息")]

public event EventHandler PageChanged;

private int rectotal = 0;

private int pagesize = 10;

private int curpage = 0;

private int lang = 0 ;

private int pagetotal = 0;

private string firstpagetext ="9";

private string prevpagetext = "3";

private string nextpagetext = "4";

private string lastpagetext = ":";

protected virtual void temp_Click(object sender, EventArgs e)

{

if (PageChanged != null)

{

PageChanged(this,e);

}

#region Pager控件使用帮助及参数说明

本控件带有三个自定义属性和一个方法.具体如下:

属性:

RecTotal 记录总数默认值:0

PageSize 每页记录数默认值:0

CurPage 当前页默认值:0

Lang 版本语言默认值:0 注:0为中文版,1为英文版

方法:

PagerBind 绑定当前自定义控件,如不绑定,该控件则不能显示到页面上

#endregion

#region 控件属性列表

[Category("分页控制"),Description("数据集所有页记录总数")]

public int RecTotal

{

get { return rectotal; }

set { rectotal = value; }

}

[Category("分页控制"),Description("每页显示记录数量")]

public int PageSize

{

get { return pagesize; }

set { pagesize = value; }

}

[Category("分页控制"),Description("当前显示页")]

public int CurPage

{

get { return curpage; }

set { curpage = value; }

}

[Category("分页控制"),Description("数据集页总数")]

public int PageTotal

{

set { pagetotal = value; }

}

[Category("分页控制"),Description("翻页条显示语言别，０为中文，１为英文")]

public int Lang

{

get { return lang; }

set { lang = value; }

}

[Category("分页控制"),Description("首页按钮文本,例如可用：第一页")]

public string FirstPageText //

{

get { return firstpagetext; }

set { firstpagetext = value; }

}

[Category("分页控制"),Description("前页按钮文本,例如可用：上一页")]

public string PrevPageText

{

get { return prevpagetext; }

set { prevpagetext = value; }

}

[Category("分页控制"),Description("下页按钮文本,例如可用：下一页")]

public string NextPageText

{

get { return nextpagetext; }

set { nextpagetext = value; }

}

[Category("分页控制"),Description("尾页按钮文本,例如可用：最后页")]

public string LastPageText

{

get { return lastpagetext; }

set { lastpagetext = value; }

}

#endregion

protected override void CreateChildControls()

{

ViewState["FirstPageText"]= firstpagetext;

ViewState["PrevPageText"] = prevpagetext;

ViewState["NextPageText"] = nextpagetext;

ViewState["LastPageText"] = lastpagetext;

Label lbl_PageInfo = new Label(); //0

lbl_PageInfo.Text = "尚未绑定";

Controls.Add(lbl_PageInfo);

LinkButton btn_First = new LinkButton(); //1

btn_First.Text = ViewState["FirstPageText"].ToString();

Controls.Add(btn_First);

btn_First.Visible = false;

btn_First.Click += new System.EventHandler(btn_First_Click);

Controls.Add(new LiteralControl(" ")); //2

LinkButton btn_Pre = new LinkButton(); //3

btn_Pre.Text = ViewState["PrevPageText"].ToString();

Controls.Add(btn_Pre);

btn_Pre.Visible = false;

btn_Pre.Click += new System.EventHandler(btn_Pre_Click);

Controls.Add(new LiteralControl(" ")); //4

LinkButton btn_Next = new LinkButton(); //5

btn_Next.Text = ViewState["NextPageText"].ToString();

Controls.Add(btn_Next);

btn_Next.Visible = false;

btn_Next.Click += new System.EventHandler(btn_Next_Click);

Controls.Add(new LiteralControl(" ")); //6

LinkButton btn_Last = new LinkButton(); //7

btn_Last.Text = ViewState["LastPageText"].ToString();

Controls.Add(btn_Last);

btn_Last.Visible = false;

btn_Last.Click += new System.EventHandler(btn_Last_Click);

Controls.Add(new LiteralControl("  ")); //8

Label lbl_1 = new Label(); //9

lbl_1.Text = "转到";

lbl_1.Visible = false;

Controls.Add(lbl_1);

DropDownList drop_CurPage = new DropDownList(); //10

drop_CurPage.Items.Add("0");

Controls.Add(drop_CurPage);

drop_CurPage.AutoPostBack = true;

drop_CurPage.Visible = false;

drop_CurPage.SelectedIndexChanged += new System.EventHandler(drop_CurPage_SelectedIndexChanged);

Label lbl_2 = new Label(); //11

lbl_2.Text = "页";

lbl_2.Visible = false;

Controls.Add(lbl_2);

}

protected override void OnPreRender(EventArgs e)

{

if (!Page.IsPostBack)

{

StartVar();

PagerBind();

}

protected void StartVar() //初始各参数．希望只执行一次

{

ViewState["RecTotal"] = rectotal;

ViewState["PageSize"] = pagesize;

ViewState["CurPage"] = curpage;

ViewState["Lang"] = lang ;

ViewState["PageTotal"] = pagetotal;

}

#region 相关方法及事件

public void PagerBind()

{

ViewState["PageTotal"]=((int)ViewState["RecTotal"]%(int)ViewState["PageSize"]>0) ? (int)ViewState["RecTotal"]/(int)ViewState["PageSize"]+1 : (int)ViewState["RecTotal"]/(int)ViewState["PageSize"]; //页总数

if ((int)ViewState["Lang"]==0)

{

((Label)Controls[0]).Text="共"+ViewState["RecTotal"].ToString()+"条信息 "+ViewState["PageSize"].ToString()+"条/页当前"+((int)ViewState["CurPage"]+1).ToString()+"/"+ViewState["PageTotal"].ToString()+"页  ";

}

else

{

((Label)Controls[0]).Text="Total"+ViewState["RecTotal"].ToString()+"Info "+ViewState["PageSize"].ToString()+"/Page Current"+((int)ViewState["CurPage"]+1).ToString()+"/"+ViewState["PageTotal"].ToString()+"Page  ";

((Label)Controls[9]).Text = "To";

((Label)Controls[11]).Text = "Page";

}

((DropDownList)Controls[10]).Items.Clear();

int i=0;

{

((DropDownList)Controls[10]).Items.Add(Convert.ToString(i+1));

i++;

}

while (i<(int)ViewState["PageTotal"]);

((DropDownList)Controls[10]).SelectedIndex = ((DropDownList)Controls[10]).Items.IndexOf(((DropDownList)Controls[10]).Items.FindByValue(Convert.ToString((int)ViewState["CurPage"]+1)));

((LinkButton)Controls[1]).Visible = true;

((LinkButton)Controls[3]).Visible = true;

((LinkButton)Controls[5]).Visible = true;

((LinkButton)Controls[7]).Visible = true;

((Label)Controls[9]).Visible = true;

((Label)Controls[11]).Visible = true;

((DropDownList)Controls[10]).Visible = true;

((LinkButton)Controls[1]).Enabled = true;

((LinkButton)Controls[3]).Enabled = true;

((LinkButton)Controls[5]).Enabled = true;

((LinkButton)Controls[7]).Enabled = true;

if ((int)ViewState["CurPage"]==0)

{

((LinkButton)Controls[1]).Enabled = false;

((LinkButton)Controls[3]).Enabled = false;

((LinkButton)Controls[5]).Enabled = true;

((LinkButton)Controls[7]).Enabled = true;

}

if ((int)ViewState["CurPage"]==( (int)ViewState["PageTotal"]-1) )

{

((LinkButton)Controls[1]).Enabled = true;

((LinkButton)Controls[3]).Enabled = true;

((LinkButton)Controls[5]).Enabled = false;

((LinkButton)Controls[7]).Enabled = false;

}

if (( (int)ViewState["PageTotal"]-1) == 0 )

{

((LinkButton)Controls[1]).Enabled = false;

((LinkButton)Controls[3]).Enabled = false;

((LinkButton)Controls[5]).Enabled = false;

((LinkButton)Controls[7]).Enabled = false;

}

CurPage = (int)ViewState["CurPage"];

RecTotal = (int)ViewState["RecTotal"];

PageSize = (int)ViewState["PageSize"];

CurPage = (int)ViewState["CurPage"];

Lang = (int)ViewState["Lang"];

PageTotal = (int)ViewState["PageTotal"];

}

private void drop_CurPage_SelectedIndexChanged(object sender, System.EventArgs e)

{

ViewState["CurPage"] = ((DropDownList)Controls[10]).SelectedIndex;

PagerBind();

if (PageChanged != null)

temp_Click(this, EventArgs.Empty);

}

private void btn_First_Click(object sender, System.EventArgs e)

{

ViewState["CurPage"] = 0;

PagerBind();

if (PageChanged != null)

temp_Click(this, EventArgs.Empty);

}

private void btn_Pre_Click(object sender, System.EventArgs e)

{

ViewState["CurPage"] = (int)ViewState["CurPage"]-1;

PagerBind();

if (PageChanged != null)

temp_Click(this, EventArgs.Empty);

}

private void btn_Next_Click(object sender, System.EventArgs e)

{

ViewState["CurPage"] = (int)ViewState["CurPage"]+1;

PagerBind();

if (PageChanged != null)

temp_Click(this, EventArgs.Empty);

}

private void btn_Last_Click(object sender, System.EventArgs e)

{

ViewState["CurPage"] = (int)ViewState["PageTotal"]-1;

PagerBind();

if (PageChanged != null)

temp_Click(this, EventArgs.Empty);

}

#endregion

}

----------------------------------end------------------------------------------------------------------------

---------WebForm1.aspx 控件测试页面文件-------------------------------------------------------------

<%@ Page language="c#" Codebehind="WebForm1.aspx.cs" AutoEventWireup="false" Inherits="MyWebControll.WebForm1" %>

<%@ Register TagPrefix="cc1" Namespace="C_Pager" Assembly="C_Pager" %>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >

<HTML>

<HEAD>

<title>WebForm1</title>

</HEAD>

<cc1:pager id="Pager1" runat="server" PageSize="4"></cc1:pager>

<asp:DataGrid id="DataGrid1" style="Z-INDEX: 101; LEFT: 24px; POSITION: absolute; TOP: 56px" runat="server"

Width="600px" Height="8px"></asp:DataGrid></form>

</body>

</HTML>

---------------------------------end------------------------------------------------------

------------WebForm1.aspx.cs 页面源文件---------------------------------------------

using System;

using System.Collections;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Web;

using System.Web.SessionState;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Web.UI.HtmlControls;

using System.Data.SqlClient;

using System.Data.OleDb;

namespace MyWebControll

{

/// <summary>

/// WebForm1 的摘要说明。

/// </summary>

public class WebForm1 : System.Web.UI.Page

{

protected C_Pager.Pager Pager1;

protected OleDbConnection conn;

protected System.Web.UI.WebControls.DataGrid DataGrid1;

protected OleDbCommand cmd;

private void Page_Load(object sender, System.EventArgs e)

{

// 在此处放置用户代码以初始化页面

conn=new OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source="+Server.MapPath("DataBase\\TestDataBase.mdb"));

if(!Page.IsPostBack)

{

DataBind(0);

}

#region Web 窗体设计器生成的代码

override protected void OnInit(EventArgs e)

{

// CODEGEN: 该调用是 ASP.NET Web 窗体设计器所必需的。

InitializeComponent();

base.OnInit(e);

}

/// <summary>

/// 设计器支持所需的方法 - 不要使用代码编辑器修改

/// 此方法的内容。

/// </summary>

private void InitializeComponent()

{

this.Pager1.PageChanged += new System.EventHandler(this.Change);

this.Load += new System.EventHandler(this.Page_Load);

}

#endregion

private void DataBind(int CurPage)//数据绑定方法

{

cmd=new OleDbCommand("select * from news order by id ",conn);

OleDbDataAdapter adapter=new OleDbDataAdapter(cmd);

DataSet ds=new DataSet();

adapter.Fill(ds,Pager1.PageSize*CurPage,Pager1.PageSize,"news");

DataGrid1.DataSource=ds.Tables["news"];

DataGrid1.DataBind();

cmd=new OleDbCommand("select count(id) from news",conn);

conn.Open();

Pager1.RecTotal = (int)cmd.ExecuteScalar();

Pager1.DataBind();

conn.Close();

}

private void Change(object sender, System.EventArgs e)

{

DataBind(Pager1.CurPage); //得到当前页记录集绑定到DataGird表上

}

---------------------------------------------end--------------------------------------------------

如果哪位朋友需要项目文件的话,也可以发邮件到我的邮箱向我索取的在(.net2003)已调试通过的项目代码(和下面的源代码一样)

我的邮箱是:jiangtinbin@163.com