掌握要點(diǎn): <IList>,DataGrid翻頁(yè)事件...
詳細(xì)代碼如下,慢慢體會(huì)..
using?System;
using?System.Collections;
using?System.Collections.Specialized;
using?System.Text;
using?System.Text.RegularExpressions;
using?System.Web.UI;
using?System.Web.UI.WebControls;

namespace?CustomControl
{
????/**////?<summary>
????///?CustomList?的摘要說(shuō)明
????///?重構(gòu)DataList控件
????///?</summary>
????public?class?CustomList?:?DataList
????{
????????//靜態(tài)常量
????????protected?const?string?HTML1?=?"<table?width=100%?cellpadding=0?cellspacing=0><tbody><tr><td>";
????????protected?const?string?HTML2?=?"</td></tr><tr><td?align=right>";
????????//protected?const?string?HTML3?=?"</td><td?align=center?class=paging>";

????????//protected?const?string?HTML5?=?"</td><td?align=right?class=paging>";

????????protected?const?string?HTML4?=?"</td></tr></tbody></table>";

????????private?static?readonly?Regex?RX?=?new?Regex(@"^&page=\d+",?RegexOptions.Compiled);
????????private?const?string?LINK_PREV?=?"<a?href=?page={0}>前一頁(yè)</a>";
????????private?const?string?LINK_MORE?=?"<a?href=?page={0}>下一頁(yè)</a>";
????????private?const?string?LINK_FIRST?=?"<a?href=?page={0}>首頁(yè)</a>";?????//首頁(yè)
????????private?const?string?LINK_LAST?=?"<a?href=?page={0}>尾頁(yè)</a>";??????//尾頁(yè)
????????private?const?string?KEY_PAGE?=?"page";
????????private?const?string?COMMA?=?"?";
????????private?const?string?AMP?=?"&";

????????protected?string?emptyText;
????????private?IList?dataSource;???????//數(shù)據(jù)源
????????private?int?pageSize?=?10;??????//每頁(yè)大小
????????private?int?currentPageIndex;???//當(dāng)前頁(yè)
????????private?int?itemCount;??????????//數(shù)據(jù)條目總數(shù)

????????/**////?<summary>
????????///?指定要綁定的數(shù)據(jù)源
????????///?</summary>
????????override?public?object?DataSource
????????{
????????????set
????????????{
????????????????//This?try?catch?block?is?to?avoid?issues?with?the?VS.NET?designer
????????????????//The?designer?will?try?and?bind?a?datasource?which?does?not?derive?from?ILIST
????????????????try
????????????????{
????????????????????dataSource?=?(IList)value;
????????????????????ItemCount?=?dataSource.Count;
????????????????}
????????????????catch
????????????????{
????????????????????dataSource?=?null;
????????????????????ItemCount?=?0;
????????????????}
????????????}
????????}

????????/**////?<summary>
????????///?每頁(yè)大小
????????///?</summary>
????????public?int?PageSize
????????{
????????????get?{?return?pageSize;?}
????????????set?{?pageSize?=?value;?}
????????}

????????/**////?<summary>
????????///?總頁(yè)數(shù)
????????///?</summary>
????????protected?int?PageCount
????????{
????????????get?{?return?(ItemCount?-?1)?/?pageSize;?}
????????}

????????/**////?<summary>
????????///?可重載,數(shù)據(jù)條目總數(shù)
????????///?</summary>
????????virtual?protected?int?ItemCount
????????{
????????????get?{?return?itemCount;?}
????????????set?{?itemCount?=?value;?}
????????}

????????/**////?<summary>
????????///?可重載,當(dāng)前頁(yè)碼
????????///?</summary>
????????virtual?public?int?CurrentPageIndex
????????{
????????????get?{?return?currentPageIndex;?}
????????????set?{?currentPageIndex?=?value;?}
????????}

????????/**////?<summary>
????????///?空Text
????????///?</summary>
????????public?string?EmptyText
????????{
????????????set?{?emptyText?=?value;?}
????????}

????????/**////?<summary>
????????///?設(shè)置頁(yè)面,翻頁(yè)事件
????????///?</summary>
????????///?<param?name="index"></param>
????????public?void?SetPage(int?index)
????????{
????????????OnPageIndexChanged(new?DataGridPageChangedEventArgs(null,?index));
????????}

????????override?protected?void?OnLoad(EventArgs?e)
????????{
????????????if?(Visible)
????????????{
????????????????string?page?=?Context.Request[KEY_PAGE];
????????????????int?index?=?(page?!=?null)???int.Parse(page)?:?0;
????????????????SetPage(index);
????????????}
????????}


????????/**////?<summary>
????????///?Overriden?method?to?control?how?the?page?is?rendered
????????///?Render提交寫入
????????///?</summary>
????????///?<param?name="writer"></param>
????????override?protected?void?Render(HtmlTextWriter?writer)
????????{

????????????//Check?there?is?some?data?attached
????????????if?(ItemCount?==?0)
????????????{
????????????????writer.Write(emptyText);
????????????????return;
????????????}

????????????//Mask?the?query?"?"/"&"二個(gè)符號(hào)
????????????string?query?=?Context.Request.Url.Query.Replace(COMMA,?AMP);
????????????//正則表達(dá)式替換
????????????query?=?RX.Replace(query,?string.Empty);


????????????//?Write?out?the?first?part?of?the?control,?the?table?header
????????????writer.Write(HTML1);

????????????//?Call?the?inherited?method
????????????base.Render(writer);

????????????//?Write?out?a?table?row?closure
????????????writer.Write(HTML2);

????????????if?(currentPageIndex?>?0)
????????????writer.Write(string.Format(LINK_FIRST,?0?+?query)?+?"&nbsp;");?????//首頁(yè)
????????????//Determin?whether?next?and?previous?buttons?are?required
????????????//Previous?button?
????????????if?(currentPageIndex?>?0)
????????????????writer.Write(string.Format(LINK_PREV,?(currentPageIndex?-?1)?+?query));

????????????//Close?the?table?data?tag
????????????//writer.Write(HTML3);

????????????//當(dāng)前頁(yè)/總頁(yè)數(shù)
????????????writer.Write("&nbsp;&nbsp;"?+?string.Format("頁(yè)碼:{0}/{1}",?currentPageIndex?+?1,?PageCount?+?1)?+?"&nbsp;&nbsp;");

????????????//writer.Write(HTML5);

????????????//Next?button?
????????????if?(currentPageIndex?<?PageCount)
????????????????writer.Write(string.Format(LINK_MORE,?(currentPageIndex?+?1)?+?query));
????????????if?(currentPageIndex?<?PageCount)
????????????writer.Write("&nbsp;"?+?string.Format(LINK_LAST,?PageCount?+?query));??????//尾頁(yè)

????????????//Close?the?table
????????????writer.Write(HTML4);
????????}

????????override?protected?void?OnDataBinding(EventArgs?e)
????????{

????????????//Work?out?which?items?we?want?to?render?to?the?page
????????????int?start?=?CurrentPageIndex?*?pageSize;
????????????int?size?=?Math.Min(pageSize,?ItemCount?-?start);

????????????IList?page?=?new?ArrayList();

????????????//Add?the?relevant?items?from?the?datasource
????????????for?(int?i?=?0;?i?<?size;?i++)
????????????????page.Add(dataSource[start?+?i]);

????????????//set?the?base?objects?datasource
????????????base.DataSource?=?page;
????????????base.OnDataBinding(e);

????????}

????????/**////?<summary>
????????///?翻頁(yè)事件
????????///?</summary>
????????public?event?DataGridPageChangedEventHandler?PageIndexChanged;

????????/**////?<summary>
????????///?可重載,翻頁(yè)事件處理
????????///?</summary>
????????///?<param?name="e"></param>
????????virtual?protected?void?OnPageIndexChanged(DataGridPageChangedEventArgs?e)
????????{
????????????if?(PageIndexChanged?!=?null)
????????????????PageIndexChanged(this,?e);
????????}
????}
}

轉(zhuǎn)載于:https://www.cnblogs.com/sjett/archive/2006/06/20/430834.html

總結(jié)

以上是生活随笔為你收集整理的petshop4学习_重构DataList实现分页的全部?jī)?nèi)容，希望文章能夠幫你解決所遇到的問題。

如果覺得生活随笔網(wǎng)站內(nèi)容還不錯(cuò)，歡迎將生活随笔推薦給好友。