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asp.net 通用分頁(yè)顯示輔助類(lèi)(改進(jìn)版)

更新時(shí)間：2010年04月12日 00:21:36 作者：

在使用ASP.NET編程時(shí)，如果不用控件的默認(rèn)分頁(yè)功能，想自己搞一個(gè)，可以看看本文的asp.net通用分頁(yè)顯示輔助類(lèi)哦。

閑暇時(shí)重新再看之前很多項(xiàng)目代碼的時(shí)候，發(fā)現(xiàn)很多總是有那么點(diǎn)缺陷的代碼，如芒刺入骨，令人心煩。掙扎良久，苦口婆心勸薦自己今后要爭(zhēng)取把某些代碼寫(xiě)的更易用更靈活更完善一些。比如在這篇已經(jīng)提及到的通用客戶端分頁(yè)顯示輔助類(lèi)（AspNetPager），在大大小小項(xiàng)目中出現(xiàn)頻率非常高，但是顯然對(duì)分頁(yè)形式的選擇和樣式的控制弱了點(diǎn)。雖然之前這個(gè)功能的實(shí)現(xiàn)都是按照實(shí)際項(xiàng)目的需求來(lái)實(shí)現(xiàn)的，對(duì)舊項(xiàng)目沒(méi)有影響，但是這也不能成為該功能沒(méi)有充分實(shí)現(xiàn)擴(kuò)展性和通用性的理由，這點(diǎn)向來(lái)自傲的樓豬也不得不承認(rèn)。

1、分頁(yè)模式和樣式擴(kuò)展
（1）定義枚舉

復(fù)制代碼代碼如下:

 
/// <summary> 
/// 表格對(duì)齊枚舉 
/// </summary> 
public enum TbAlignEnum 
{ 
Left = 1, 

Center = 2, 

Right = 3 
} 

/// <summary> 
/// 分頁(yè)模式 
/// </summary> 
public enum PagerModoule 
{ 
/// <summary> 
/// 普通分頁(yè)模式 
/// </summary> 
Normal = 1, 

/// <summary> 
/// 統(tǒng)計(jì)分頁(yè)模式 
/// </summary> 
Statistics = 2 
} 

（2）根據(jù)枚舉呈現(xiàn)

復(fù)制代碼代碼如下:

 
/// <summary> 
/// 分頁(yè)實(shí)用類(lèi) 
/// </summary> 
public sealed class AspNetPager 
{ 
#region common 

private const string defaultAlign = "center";//默認(rèn)對(duì)齊方式 
private const string leftAlign = "left"; 
private const string rightAlign = "right"; 

/// <summary> 
/// 獲取頁(yè)數(shù) 
/// </summary> 
/// <param name="objs">總記錄數(shù)</param> 
/// <param name="recordCountPerPage">每頁(yè)記錄數(shù)</param> 
/// <returns></returns> 
public static int GetPageCout(object[] objs, int recordCountPerPage) 
{ 
return (int)Math.Ceiling(((double)objs.Length / (double)recordCountPerPage)); 
} 

/// <summary> 
/// 獲取頁(yè)數(shù) 
/// </summary> 
/// <param name="totalCount">總記錄數(shù)</param> 
/// <param name="recordCountPerPage">每頁(yè)記錄數(shù)</param> 
/// <returns></returns> 
public static int GetPageCout(int totalCount, int recordCountPerPage) 
{ 
int result = 0; 
if (totalCount % recordCountPerPage == 0) 
{ 
result = totalCount / recordCountPerPage; 
} 
else 
{ 
result = totalCount / recordCountPerPage + 1; 
} 
return result; 
} 

#endregion 

#region render pager 

/// <summary> 
/// 寫(xiě)分頁(yè)頁(yè)碼(沒(méi)有表格) 
/// </summary> 
/// <param name="pagerMode"></param> 
/// <param name="response"></param> 
/// <param name="baseString"></param> 
/// <param name="totalCount">總記錄數(shù)</param> 
/// <param name="nowPage">當(dāng)前頁(yè)數(shù)</param> 
/// <param name="recordCountPerPage">每頁(yè)記錄數(shù)</param> 
public static void RenderPager(PagerModoule pagerMode, HttpResponse response, int totalCount, int nowPage, int recordCountPerPage, string baseString) 
{ 
int pageCount = GetPageCout(totalCount, recordCountPerPage); 
string pagerString = string.Empty; 
if (pageCount > 0) 
{ 
switch (pagerMode) 
{ 
case PagerModoule.Normal: 
pagerString = CreateLinkUrl(baseString, pageCount, nowPage, recordCountPerPage); 
break; 
case PagerModoule.Statistics: 
pagerString = CreateStatisticLinkUrl(baseString, totalCount, pageCount, nowPage, recordCountPerPage); 
break; 
default: 
pagerString = CreateLinkUrl(baseString, pageCount, nowPage, recordCountPerPage); 
break; 
} 
response.Write(pagerString); 
} 
} 

/// <summary> 
/// 寫(xiě)分頁(yè)頁(yè)碼(有表格) 
/// </summary> 
/// <param name="pagerMode"></param> 
/// <param name="alignEnum"></param> 
/// <param name="response"></param> 
/// <param name="baseString"></param> 
/// <param name="totalCount">總記錄數(shù)</param> 
/// <param name="nowPage">當(dāng)前頁(yè)數(shù)</param> 
/// <param name="recordCountPerPage">每頁(yè)記錄數(shù)</param> 
public static void RenderTablePager(PagerModoule pagerMode, TbAlignEnum alignEnum, HttpResponse response, int totalCount, int nowPage, int recordCountPerPage, string baseString) 
{ 
int pageCount = GetPageCout(totalCount, recordCountPerPage); 
if (pageCount > 0) 
{ 
string align = string.Empty; 
switch (alignEnum) 
{ 
case TbAlignEnum.Left: 
align = leftAlign; 
break; 
case TbAlignEnum.Center: 
align = defaultAlign; 
break; 
case TbAlignEnum.Right: 
align = rightAlign; 
break; 
default: 
align = defaultAlign; 
break; 
} 
StringBuilder sbTable = new StringBuilder(); 
sbTable.AppendFormat("<table><tr align='{0}'><td>", align); 
string pagerString = string.Empty; 
switch (pagerMode) 
{ 
case PagerModoule.Normal: 
pagerString = CreateLinkUrl(baseString, pageCount, nowPage, recordCountPerPage); 
break; 
case PagerModoule.Statistics: 
pagerString = CreateStatisticLinkUrl(baseString, totalCount, pageCount, nowPage, recordCountPerPage); 
break; 
default: 
pagerString = CreateLinkUrl(baseString, pageCount, nowPage, recordCountPerPage); 
break; 
} 
sbTable.Append(pagerString); 
sbTable.Append("</td></tr></table>"); 
response.Write(sbTable.ToString()); 
} 
} 

#endregion 

#region create link 

/// <summary> 
/// 生成分頁(yè)字符串(顯示頁(yè)數(shù)和每頁(yè)記錄數(shù)相關(guān)) 
/// </summary> 
/// <param name="baseString"></param> 
/// <param name="pageCount">頁(yè)數(shù)</param> 
/// <param name="nowPage">當(dāng)前頁(yè)數(shù)</param> 
/// <param name="recordCountPerPage">每頁(yè)記錄數(shù)(推薦記錄數(shù)：10)</param> 
/// <returns></returns> 
private static string CreateLinkUrl(string baseString, int pageCount, int nowPage, int recordCountPerPage) 
{ 
StringBuilder sb = new StringBuilder(); 
int from, to; 
if (nowPage - recordCountPerPage > 0) 
{ 
from = nowPage - recordCountPerPage; 
} 
else 
from = 1; 
if (pageCount == 0) 
pageCount = 1; 
if (pageCount - nowPage - recordCountPerPage > 0) 
{ 
to = nowPage + recordCountPerPage; 
} 
else 
to = pageCount; 

if (baseString.IndexOf("?") == -1) 
baseString += "?"; 
else 
baseString += "&"; 
sb.Append(string.Format("<a href=\"{0}pageIndex=1\" >首頁(yè)</a>", baseString)); 
if (pageCount > 1 && nowPage > 1) 
{ 
sb.AppendFormat("<a href=\"{0}pageIndex={1}\" >上一頁(yè)</a>", baseString, (nowPage - 1).ToString()); 
} 
else 
{ 
sb.Append("<a href='javascript:void(0);' style='color:gray;' >上一頁(yè)</a>"); 
} 
for (int i = from; i <= to; i++) 
{ 
if (i == nowPage) 
{ 
sb.AppendFormat("&nbsp;<a href='javascript:void(0);' style='color:red;' >{0}</a>", nowPage.ToString()); 
} 
else 
{ 
sb.AppendFormat("&nbsp;<a href=\"{0}pageIndex={1}\" >{1}</a>", baseString, i); 
} 
} 
if (pageCount > 1 && nowPage < pageCount) 
{ 
sb.AppendFormat("<a href=\"{0}pageIndex={1}\" >下一頁(yè)</a>", baseString, (nowPage + 1).ToString()); 
} 
else 
{ 
sb.Append("<a href=\"javascript:void(0);\" style='color:gray;' >下一頁(yè)</a>"); 
} 
sb.Append(string.Format("&nbsp;<a href={0}pageIndex={1} >尾頁(yè)</a>", baseString, pageCount)); 
return sb.ToString(); 
} 

/// <summary> 
/// 生成含統(tǒng)計(jì)信息的分頁(yè)字符串(顯示頁(yè)數(shù)和每頁(yè)記錄數(shù)相關(guān)) 
/// </summary> 
/// <param name="baseString"></param> 
/// <param name="totalCount">總記錄數(shù)</param> 
/// <param name="pageCount">頁(yè)數(shù)</param> 
/// <param name="nowPage">當(dāng)前頁(yè)數(shù)</param> 
/// <param name="recordCountPerPage">每頁(yè)記錄數(shù)(推薦記錄數(shù)：10)</param> 
/// <returns></returns> 
private static string CreateStatisticLinkUrl(string baseString, int totalCount, int pageCount, int nowPage, int recordCountPerPage) 
{ 
StringBuilder sb = new StringBuilder(); 
string numricPager = CreateLinkUrl(baseString, pageCount, nowPage, recordCountPerPage);//普通數(shù)字分頁(yè) 
sb.AppendFormat("總共<span style='color:red;'>{0}</span>條記錄,共<span style='color:red;'>{1}</span>頁(yè),當(dāng)前第<span style='color:red;'>{2}</span>頁(yè)&nbsp;&nbsp;", 
totalCount, pageCount, nowPage); 
sb.Append(numricPager); 
return sb.ToString(); 
} 

#endregion 
} 

ps1：除了表格內(nèi)容對(duì)齊方式外，代碼里對(duì)樣式的控制幾乎都是硬編碼，個(gè)人認(rèn)為編碼階段對(duì)樣式的控制越少越好。理想狀態(tài)下，樣式應(yīng)該讓UI全部在外部控制，而不應(yīng)該由程序員來(lái)設(shè)計(jì)實(shí)現(xiàn)，這里結(jié)合實(shí)際情況取折中方案。
ps2：分頁(yè)顯示的方式其實(shí)還可以擴(kuò)展，具體請(qǐng)參考gridview控件分頁(yè)模式。
2、頁(yè)面內(nèi)調(diào)用

復(fù)制代碼代碼如下:

 
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Pager.aspx.cs" Inherits="WebTest.Pager" %> 

<%@ Import Namespace=" DotNet.Common.WebForm" %> 
<!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>aspnet簡(jiǎn)單分頁(yè)</title> 
</head> 
<body> 
<form id="form1" runat="server"> 
<div> 
<%DotNet.Common.WebForm.AspNetPager.RenderTablePager(PagerModoule.Normal, TbAlignEnum.Right, Response, 93, 10, 10, "Pager.aspx"); %> 
</div> 
</form> 
</body> 
</html> 