简单好用的ASP.NET分页类（支持AJAX、自定义文字）

在做网站没用 JS UI控件时 很实用

用法：

var ps=new PageString();

 /*可选参数*/

 ps.SetIsEnglish = true;// 是否是英文    (默认：false)
 ps.SetIsShowText = true;//是否显示分页文字 (默认：true)
 //ps.TextFormat=""             (默认值：《span class=\"pagetext\"》《strong》总共《/strong》:{0} 条 《strong》当前《/strong》:{1}/{2}《/span》)
 //ps.SetPageIndexName Request["pageIndex"](默认值："pageIndex")
 ps.SetIsAjax = false;//          (默认值："false")

 /*函数参数*/
 int total = 10000;
 int pageSize = 10;
 int pageIndex = Convert.ToInt32(Request["pageIndex"]);

 var page = ps.ToString(total, pageSize, pageIndex, "/UI/PageStringTest.aspx?");

 //获取 page html 输出
Response.Write(page);

效果：

代码：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;

namespace SyntacticSugar
{
  /// <summary>
  /// ** 描述：分页类
  /// ** 创始时间：2015-5-29
  /// ** 修改时间：-
  /// ** 作者：sunkaixuan
  public class PageString
  {
    /// <summary>
    /// 是否是英文   (默认：false)
    /// </summary>
    public bool SetIsEnglish { get; set; }
    /// <summary>
    /// 是否显示分页文字(默认：true)
    /// </summary>
    public bool SetIsShowText { get; set; }
    /// <summary>
    /// 样式      (默认:"pagination")
    /// </summary>
    public string SetClassName { get; set; }
    /// <summary>
    /// 分页参数名   (默认:"pageIndex")
    /// </summary>
    public string SetPageIndexName { get; set; }
    /// <summary>
    /// 是否是异步 同步 href='' 异步 onclick=ajaxPage()  (默认:false)
    /// </summary>
    public bool SetIsAjax { get; set; }

    /// <summary>
    /// 自定义文字
    /// string.Format("{0}{1}{2}","总记录数","当前页数","总页数")
    /// 默认值：《span class=\"pagetext\"》《strong》总共《/strong》:{0} 条 《strong》当前《/strong》:{1}/{2}《/span》
    /// </summary>
    public string SetTextFormat { get; set; }

    public PageString()
    {
      SetIsEnglish = false;
      SetIsShowText = true;
      SetTextFormat = "<span class=\"pagetext\"><strong>总共</strong>:{0} 条 <strong>当前</strong>:{1}/{2}</span> ";
      SetClassName = "pagination";
      SetPageIndexName = "pageIndex";
      SetIsAjax = false;
    }

    /*免费的样式
    .pagination .click {cursor:pointer}
    .pagination a{text-decoration: none;border: 1px solid #AAE;color: #15B;font-size: 13px;border-radius: 2px;}
    .pagination span{ color:#666;font-size:13px;display: inline-block;border: 1px solid #ccc;padding: 0.2em 0.6em;}
    .pagination span.pagetext{ border:none}
    .pagination a:hover{background: #26B;color: #fff;}
    .pagination a{display: inline-block;padding: 0.2em 0.6em;}
    .pagination .page_current{background: #26B;color: #fff;border: 1px solid #AAE;margin-right: 5px;}
    .pagination{margin-top: 20px;}
    .pagination .current.prev, .pagination .current.next{color: #999;border-color: #999;background: #fff;}
     * */

    /// <summary>
    /// 分页算法＜一＞共20页 首页 上一页 1 2 3 4 5 6 7 8 9 10 下一页 末页
    /// </summary>
    /// <param name="total">总记录数</param>
    /// <param name="pageSize">每页记录数</param>
    /// <param name="pageIndex">当前页数</param>
    /// <param name="query_string">Url参数</param>
    /// <returns></returns>
    public string ToString(int total, int pageSize, int pageIndex, string query_string)
    {

      int allpage = 0;
      int next = 0;
      int pre = 0;
      int startcount = 0;
      int endcount = 0;
      StringBuilder pagestr = new StringBuilder();
      pageIndex = pageIndex == 0 ? 1 : pageIndex;
      pagestr.AppendFormat("<div class=\"{0}\" >", SetClassName);
      if (pageIndex < 1) { pageIndex = 1; }
      //计算总页数
      if (pageSize != 0)
      {
        allpage = (total / pageSize);
        allpage = ((total % pageSize) != 0 ? allpage + 1 : allpage);
        allpage = (allpage == 0 ? 1 : allpage);
      }
      next = pageIndex + 1;
      pre = pageIndex - 1;
      startcount = (pageIndex + 5) > allpage ? allpage - 9 : pageIndex - 4;//中间页起始序号
      //中间页终止序号
      endcount = pageIndex < 5 ? 10 : pageIndex + 5;
      if (startcount < 1) { startcount = 1; } //为了避免输出的时候产生负数，设置如果小于1就从序号1开始
      if (allpage < endcount) { endcount = allpage; }//页码+5的可能性就会产生最终输出序号大于总页码，那么就要将其控制在页码数之内

      bool isFirst = pageIndex == 1;
      bool isLast = pageIndex == allpage;

      if (SetIsShowText)
        pagestr.AppendFormat(SetTextFormat, total, pageIndex, allpage);

      if (isFirst)
      {
        pagestr.Append("<span>首页</span> <span>上一页</span>");
      }
      else
      {
        pagestr.AppendFormat("<a href=\"{0}pageIndex=1\">首页</a> <a href=\"{0}pageIndex={1}\">上一页</a>", query_string, pre);
      }
      //中间页处理，这个增加时间复杂度，减小空间复杂度
      for (int i = startcount; i <= endcount; i++)
      {
        bool isCurent = pageIndex == i;
        if (isCurent)
        {
          pagestr.Append(" <a class=\"page_current\">" + i + "</a>");
        }
        else
        {
          pagestr.Append("  <a href=\"" + query_string + "pageIndex=" + i + "\">" + i + "</a>");
        }

      }
      if (isLast)
      {
        pagestr.Append("<span>下一页</span> <span>末页</span>");
      }
      else
      {
        pagestr.Append(" <a href=\"" + query_string + "pageIndex=" + next + "\">下一页</a> <a href=\"" + query_string + "pageIndex=" + allpage + "\">末页</a>");
      }
      pagestr.AppendFormat("</div>");
      return ConversionData(pagestr.ToString());
    }

    private string ConversionData(string page)
    {
      if (SetIsEnglish)
      {
        page= page.Replace("上一页", "Previous").Replace("下一页", "Next").Replace("总共", "total").Replace("当前", "Current").Replace("条", "records").Replace("首页", "First").Replace("末页", "Last");
      }
      if (SetIsAjax)
      {
        var matches = Regex.Matches(page, @"href\="".*?""",RegexOptions.Singleline);
        if (matches != null && matches.Count > 0)
        {
          foreach (Match m in matches)
          {
            page = page.Replace(m.Value, string.Format("class=\"click\" onclick=\"ajaxPage('{0}')\"", Regex.Match(m.Value, string.Format(@"{0}\=(\d+)", SetPageIndexName)).Groups[1].Value));
          }
        }
      }
      return page;

    }

  }

}