實作DataList分頁功能

最近友人詢問DataGrid有內建的分頁功能，可是DataList卻沒有，那該怎麼做呢？
以下且看包仔分解。

DataListTest.aspx

〈%@ Page Language="C#" AutoEventWireup="true" CodeFile="DataListTest.aspx.cs" Inherits="DataListTest" %〉

〈!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"〉

〈html xmlns="http://www.w3.org/1999/xhtml" 〉
〈head runat="server"〉
〈title〉未命名頁面〈/title〉
〈/head〉
〈body〉
〈form id="form1" runat="server"〉
〈div〉
〈asp:DataList ID="DataList1" runat="server" RepeatColumns="5" RepeatDirection="Horizontal"〉
〈ItemTemplate〉
〈asp:ImageButton ID="ImageButton1" runat="server" ImageUrl='〈%# GetImg(Eval("AdPicName","{0}")) %〉' /〉
〈/ItemTemplate〉
〈FooterTemplate〉
〈/FooterTemplate〉
〈/asp:DataList〉〈/div〉
〈/form〉
〈/body〉
〈/html〉

DataListTest.aspx.cs

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Drawing;
using System.Data.Sql;
using System.Data.SqlClient;

public partial class DataListTest : System.Web.UI.Page
{
PagedDataSource pds;
int pageCount = 5;//取得顯示資料來源中所有項目所需的頁面總數
int pagecount = 5;
int CurrentPage = 0;

protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
GetMediaList();
}
}

//綁入圖片連結
public string GetImg(string filename)
{
return "~/DataListImages/" + filename;
}

public void GetMediaList()
{
SqlConnection cn = new SqlConnection(@"server=localhost;uid=sa;pwd=2u031j4xji4j04njo4;database=testDB");

SqlDataAdapter da = new SqlDataAdapter("select * from EIP_AdPic", cn);

DataSet ds = new DataSet();

cn.Open();

da.Fill(ds);

cn.Close();

pds = new PagedDataSource();

pds.DataSource = ds.Tables[0].DefaultView;
pds.AllowPaging = true;
pds.PageSize = pagecount;

this.DataList1.ItemDataBound += new DataListItemEventHandler(list_ItemDataBound);

try
{
if (Request.QueryString["page"] != null)
CurrentPage = Convert.ToInt32(Request.QueryString["page"]); // int CurrentPage = 0;
else
CurrentPage = 1;

pds.CurrentPageIndex = CurrentPage - 1; // PagedDataSource.CurentPageIndex: 取得或設定目前介面的索引
}
catch
{}
this.DataList1.DataSource = pds;
this.DataList1.DataBind();
}

void list_ItemDataBound(object sender, DataListItemEventArgs e)
{

if (e.Item.ItemType == ListItemType.Footer)
{
if (pds.PageCount > 1) // PagedDataSource.PageCount:取得顯示資料來源中所有項目所需的頁面總數(1網頁頁尾顯示幾張分頁數)
{
string mypath = Request.Path;
int first;
int last;

if ((CurrentPage%pageCount)!= 0)
{
first = ((CurrentPage/pageCount)*pageCount)+1;
if (((CurrentPage/(pageCount)*pageCount)+pageCount)〈=pds.PageCount)
{
last=((CurrentPage/pageCount)*pageCount)+pageCount;
}
else
{
last = pds.PageCount;
}
}
else
{
first = ((CurrentPage/(pageCount+1))*pageCount)+1;
if ((((CurrentPage/(pageCount + 1))*pageCount)+pageCount)〈=pds.PageCount)
{
last = ((CurrentPage/(pageCount+1))*pageCount)+pageCount;
}
else
{
last = pds.PageCount;
}
}

e.Item.Controls.Add(new LiteralControl("〈table width='100%' height='50px'〉〈tr〉〈td height='50%'〉〈/td〉〈/tr〉" +"〈tr align='center'〉〈td Class='p1'〉"));
e.Item.Controls.Add(new LiteralControl(string.Format("目前在{0}頁", CurrentPage)));
e.Item.Controls.Add(new LiteralControl("　"));

if (!pds.IsFirstPage)
{
HyperLink newLink = new HyperLink();
newLink.ID = "firstpage";
newLink.Text = "上一頁";
newLink.NavigateUrl = string.Format("{0}?page={3}", mypath, (CurrentPage - 1).ToString());
e.Item.Controls.Add(newLink);
e.Item.Controls.Add(new LiteralControl("　"));
}

for (int i = first; i 〈= last; i++)
{
HyperLink newLink = new HyperLink();
newLink.ID = string.Format("page0{0}", i.ToString());
newLink.Text = i.ToString();
newLink.NavigateUrl = string.Format("{0}?page={3}", mypath, i.ToString());
e.Item.Controls.Add(newLink);
e.Item.Controls.Add(new LiteralControl("　"));
}

if (!pds.IsLastPage)
{
HyperLink newLink = new HyperLink();
newLink.ID = "lastpage";
newLink.Text = "下一頁";
newLink.NavigateUrl = string.Format("{0}?page={3}", mypath, (CurrentPage + 1).ToString());
e.Item.Controls.Add(newLink);
e.Item.Controls.Add(new LiteralControl("　"));
}
e.Item.Controls.Add(new LiteralControl(string.Format("共{0}頁", pds.PageCount)));
e.Item.Controls.Add(new LiteralControl("〈/td〉〈/tr〉〈/table〉"));
((HyperLink)e.Item.FindControl(string.Format("page0{0}", CurrentPage))).ForeColor = Color.Black;
}
}
}
}