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asp.net 通用分頁顯示輔助類(改進(jìn)版)

更新時間：2010年04月12日 00:21:36 作者：

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

閑暇時重新再看之前很多項目代碼的時候，發(fā)現(xiàn)很多總是有那么點缺陷的代碼，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取把某些代碼寫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顯示輔助類（AspNetPager），在大大小小項目中出現(xiàn)頻率非常高，但是顯然對分頁形式的選擇和樣式的控制弱了點。雖然之前這個功能的實現(xiàn)都是按照實際項目的需求來實現(xiàn)的，對舊項目沒有影響，但是這也不能成為該功能沒有充分實現(xiàn)擴(kuò)展性和通用性的理由，這點向來自傲的樓豬也不得不承認(rèn)。

1、分頁模式和樣式擴(kuò)展
（1）定義枚舉

復(fù)制代碼代碼如下:

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

Center = 2, 

Right = 3 
} 

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

/// <summary> 
/// 統(tǒng)計分頁模式 
/// </summary> 
Statistics = 2 
} 

（2）根據(jù)枚舉呈現(xiàn)

復(fù)制代碼代碼如下:

 
/// <summary> 
/// 分頁實用類 
/// </summary> 
public sealed class AspNetPager 
{ 
#region common 

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

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

/// <summary> 
/// 獲取頁數(shù) 
/// </summary> 
/// <param name="totalCount">總記錄數(shù)</param> 
/// <param name="recordCountPerPage">每頁記錄數(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> 
/// 寫分頁頁碼(沒有表格) 
/// </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)前頁數(shù)</param> 
/// <param name="recordCountPerPage">每頁記錄數(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> 
/// 寫分頁頁碼(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)前頁數(shù)</param> 
/// <param name="recordCountPerPage">每頁記錄數(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> 
/// 生成分頁字符串(顯示頁數(shù)和每頁記錄數(shù)相關(guān)) 
/// </summary> 
/// <param name="baseString"></param> 
/// <param name="pageCount">頁數(shù)</param> 
/// <param name="nowPage">當(dāng)前頁數(shù)</param> 
/// <param name="recordCountPerPage">每頁記錄數(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</a>", baseString)); 
if (pageCount > 1 && nowPage > 1) 
{ 
sb.AppendFormat("<a href=\"{0}pageIndex={1}\" >上一頁</a>", baseString, (nowPage - 1).ToString()); 
} 
else 
{ 
sb.Append("<a href='javascript:void(0);' style='color:gray;' >上一頁</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</a>", baseString, (nowPage + 1).ToString()); 
} 
else 
{ 
sb.Append("<a href=\"javascript:void(0);\" style='color:gray;' >下一頁</a>"); 
} 
sb.Append(string.Format("&nbsp;<a href={0}pageIndex={1} >尾頁</a>", baseString, pageCount)); 
return sb.ToString(); 
} 

/// <summary> 
/// 生成含統(tǒng)計信息的分頁字符串(顯示頁數(shù)和每頁記錄數(shù)相關(guān)) 
/// </summary> 
/// <param name="baseString"></param> 
/// <param name="totalCount">總記錄數(shù)</param> 
/// <param name="pageCount">頁數(shù)</param> 
/// <param name="nowPage">當(dāng)前頁數(shù)</param> 
/// <param name="recordCountPerPage">每頁記錄數(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 
sb.AppendFormat("總共<span style='color:red;'>{0}</span>條記錄,共<span style='color:red;'>{1}</span>頁,當(dāng)前第<span style='color:red;'>{2}</span>頁&nbsp;&nbsp;", 
totalCount, pageCount, nowPage); 
sb.Append(numricPager); 
return sb.ToString(); 
} 

#endregion 
} 

ps1：除了表格內(nèi)容對齊方式外，代碼里對樣式的控制幾乎都是硬編碼，個人認(rèn)為編碼階段對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)該由程序員來設(shè)計實現(xiàn)，這里結(jié)合實際情況取折中方案。
ps2：分頁顯示的方式其實還可以擴(kuò)展，具體請參考gridview控件分頁模式。
2、頁面內(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簡單分頁</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> 