改进一个asp.net通用分页显示辅助类

前言：闲暇时重新再看之前很多项目代码的时候，发现很多总是有那么点缺陷的代码，如芒刺入骨，令人心烦。挣扎良久，苦口婆心劝荐自己今后要争取把某些代码写的更易用更灵活更完善一些。比如在这篇已经提及到的通用客户端分页显示辅助类（AspNetPager），在大大小小项目中出现频率非常高，但是显然对分页形式的选择和样式的控制弱了点。虽然之前这个功能的实现都是按照实际项目的需求来实现的，对旧项目没有影响，但是这也不能成为该功能没有充分实现扩展性和通用性的理由，这点向来自傲的楼猪也不得不承认。

1、分页模式和样式扩展
 （1）定义枚举

代码

     ///   <summary>
     ///  表格对齐枚举
     ///   </summary>
     public   enum  TbAlignEnum
    {
        Left  =   1 ,

        Center  =   2 ,

        Right  =   3
    }

     ///   <summary>
     ///  分页模式
     ///   </summary>
     public   enum  PagerModoule
    {
         ///   <summary>
         ///  普通分页模式
         ///   </summary>
        Normal  =   1 ,

         ///   <summary>
         ///  统计分页模式
         ///   </summary>
        Statistics  =   2
    }

 （2）根据枚举呈现

代码

  ///   <summary>
     ///  分页实用类
     ///   </summary>
     public   sealed   class  AspNetPager
    {
         #region  common

         private   const   string  defaultAlign  =   " center " ; // 默认对齐方式
         private   const   string  leftAlign  =   " left " ;
         private   const   string  rightAlign  =   " right " ;

         ///   <summary>
         ///  获取页数
         ///   </summary>
         ///   <param name="objs"> 总记录数 </param>
         ///   <param name="recordCountPerPage"> 每页记录数 </param>
         ///   <returns></returns>
         public   static   int  GetPageCout( object [] objs,  int  recordCountPerPage)
        {
             return  ( int )Math.Ceiling((( double )objs.Length  /  ( double )recordCountPerPage));
        }

         ///   <summary>
         ///  获取页数
         ///   </summary>
         ///   <param name="totalCount"> 总记录数 </param>
         ///   <param name="recordCountPerPage"> 每页记录数 </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>
         ///  写分页页码(没有表格)
         ///   </summary>
         ///   <param name="pagerMode"></param>
         ///   <param name="response"></param>
         ///   <param name="baseString"></param>
         ///   <param name="totalCount"> 总记录数 </param>
         ///   <param name="nowPage"> 当前页数 </param>
         ///   <param name="recordCountPerPage"> 每页记录数 </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>
         ///  写分页页码(有表格)
         ///   </summary>
         ///   <param name="pagerMode"></param>
         ///   <param name="alignEnum"></param>
         ///   <param name="response"></param>
         ///   <param name="baseString"></param>
         ///   <param name="totalCount"> 总记录数 </param>
         ///   <param name="nowPage"> 当前页数 </param>
         ///   <param name="recordCountPerPage"> 每页记录数 </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>
         ///  生成分页字符串(显示页数和每页记录数相关)
         ///   </summary>
         ///   <param name="baseString"></param>
         ///   <param name="pageCount"> 页数 </param>
         ///   <param name="nowPage"> 当前页数 </param>
         ///   <param name="recordCountPerPage"> 每页记录数(推荐记录数：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 Format( " <a href=\ " { 0 }pageIndex = 1 \ "  >首页</a> " , baseString);
             if  (pageCount  >   1   &&  nowPage  >   1 )
            {
                sb.AppendFormat( " <a href=\ " { 0 }pageIndex = { 1 }\ "  >上一页</a> " , baseString, (nowPage  -   1 ).ToString());
            }
             else
            {
                sb.Append( " <a href='javascript:void(0);' style='color:gray;' >上一页</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 }\ "  >下一页</a> " , baseString, (nowPage  +   1 ).ToString());
            }
             else
            {
                sb.Append( " <a href=\ " javascript: void ( 0 );\ "  style='color:gray;' >下一页</a> " );
            }
            sb.Append Format( " &nbsp;<a href={0}pageIndex={1} >尾页</a> " , baseString, pageCount);
             return  sb.ToString();
        }

         ///   <summary>
         ///  生成含统计信息的分页字符串(显示页数和每页记录数相关)
         ///   </summary>
         ///   <param name="baseString"></param>
         ///   <param name="totalCount"> 总记录数 </param>
         ///   <param name="pageCount"> 页数 </param>
         ///   <param name="nowPage"> 当前页数 </param>
         ///   <param name="recordCountPerPage"> 每页记录数(推荐记录数：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); // 普通数字分页
            sb.AppendFormat( " 总共<span style='color:red;'>{0}</span>条记录,共<span style='color:red;'>{1}</span>页,当前第<span style='color:red;'>{2}</span>页&nbsp;&nbsp; " ,
                totalCount, pageCount, nowPage);
            sb.Append(numricPager);
             return  sb.ToString();
        }

         #endregion
    }

ps1：除了表格内容对齐方式外，代码里对样式的控制几乎都是硬编码，个人认为编码阶段对样式的控制越少越好。理想状态下，样式应该让UI全部在外部控制，而不应该由程序员来设计实现，这里结合实际情况取折中方案。
ps2：分页显示的方式其实还可以扩展，具体请参考gridview控件分页模式。
2、页面内调用

代码

<% @ 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简单分页 </ 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 >

3、有图有真相
（1）、普通模式

（2）、带统计模式

最后，欢迎补充，期待您的建议和意见。

demo下载：demo