分页算法
声名对象
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.SetTextFormat (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")用法
int total = 10000; int pageSize = 10; int pageIndex = Convert.ToInt32(Request["pageIndex"]); var page = ps.ToPageString(total, pageSize, pageIndex, "/UI/PageStringTest.aspx?");
输出分页HTML
Response.Write(page);
效果图
源码
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
{
private ParamsModel _params;
public PageString()
{
_params = new ParamsModel()
{
IsEnglish = false,
IsShowText = true,
TextFormat = "<span class=\"pagetext\"><strong>总共</strong>:{0} 条 <strong>当前</strong>:{1}/{2}</span> ",
ClassName = "pagination",
PageIndexName = "pageIndex",
IsAjax = false
};
}
#region set method
/// <summary>
/// 是否是英文 (默认：false)
/// </summary>
public void SetIsEnglish(bool isEnglish)
{
_params.IsEnglish = isEnglish;
}
/// <summary>
/// 是否显示分页文字(默认：true)
/// </summary>
public void SetIsShowText(bool isShowText)
{
_params.IsShowText = isShowText;
}
/// <summary>
/// 样式 (默认:"pagination")
/// </summary>
public void SetClassName(string className)
{
_params.ClassName = className;
}
/// <summary>
/// 分页参数名 (默认:"pageIndex")
/// </summary>
public void SetPageIndexName(string pageIndexName)
{
_params.PageIndexName = pageIndexName;
}
/// <summary>
/// 是否是异步 同步 href='' 异步 onclick=ajaxPage() (默认:false)
/// </summary>
public void SetIsAjax(bool isAjax)
{
_params.IsAjax = isAjax;
}
/// <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 void SetTextFormat(string textFormat)
{
_params.TextFormat = textFormat;
}
#endregion
/*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;}
* */
#region main method
/// <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 ToPageString(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}\" >", _params.ClassName);
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 (_params.IsShowText)
pagestr.AppendFormat(_params.TextFormat, 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());
}
#endregion
#region private method
private string ConversionData(string page)
{
if (_params.IsEnglish)
{
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 (_params.IsAjax)
{
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+)", _params.PageIndexName)).Groups[1].Value));
}
}
}
return page;
}
#endregion
#region model
private class ParamsModel
{
/// <summary>
/// 是否是英文 (默认：false)
/// </summary>
public bool IsEnglish { get; set; }
/// <summary>
/// 是否显示分页文字(默认：true)
/// </summary>
public bool IsShowText { get; set; }
/// <summary>
/// 样式 (默认:"pagination")
/// </summary>
public string ClassName { get; set; }
/// <summary>
/// 分页参数名 (默认:"pageIndex")
/// </summary>
public string PageIndexName { get; set; }
/// <summary>
/// 是否是异步 同步 href='' 异步 onclick=ajaxPage() (默认:false)
/// </summary>
public bool IsAjax { 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 TextFormat { get; set; }
}
#endregion
}
}
