C#分页

using System;
namespace Page
{
    class Program
    {
        //url连接，countdatas表数据总行数，currentpage第几页（0是第一页），everpage每页多少行,beforlaterln前后长度
        public String pagestr(String url, int countdatas, int currentpage, int everpage, int beforlaterln)
        {
            String page = "";
            int intpart = countdatas / everpage;//整数
            int remainderpart = countdatas % everpage;//余数
            int countpage = intpart;//取整数
            currentpage = currentpage < 0 ? 0 : currentpage;
            if (remainderpart == 0)
            {//余数判断
                currentpage = currentpage > countpage - 1 ? countpage - 1 : currentpage;
                int pp = currentpage + 1;
                String strbe = "";
                int pagebefore = pp - beforlaterln - 1;
                for (int i = pp; i > pagebefore; i--)
                {
                    if (i > 0 && i < pp)
                    {
                        strbe = "<a class='num' href='" + url + "&p=" + (i - 1) + "'>" + i + "</a>" + strbe;
                    }
                }
                if (pp <= 1) { strbe = ""; } else { strbe = "<a class='num' href='" + url + "&p=0'>首页</a>" + "<a class='num' href='" + url + "&p=" + (pp - 2) + "'>上一页</a>" + strbe; }
                String strmid = "<span class='current'>" + pp + "</span>";
                String strlater = "";
                int pagelater = pp + beforlaterln;
                for (int i = pp; i < pagelater; i++)
                {
                    if (i < countpage)
                    {
                        strlater += "<a class='num' href='" + url + "&p=" + (i) + "'>" + (i + 1) + "</a>";
                    }
                }
                if (pp >= countpage) { } else { strlater += "<a class='num' href='" + url + "&p=" + pp + "'>下一页</a>" + "<a class='num' href='" + url + "&p=" + (countpage - 1) + "'>尾页</a>"; }
                page = strbe + strmid + strlater;
            }
            else
            {
                countpage += 1;//总页数
                currentpage = currentpage > countpage - 1 ? countpage - 1 : currentpage;
                int pp = currentpage + 1;
                String strbe = "";
                int pagebefore = pp - beforlaterln - 1;
                for (int i = pp; i > pagebefore; i--)
                {
                    if (i > 0 && i < pp)
                    {
                        strbe = "<a class='num' href='" + url + "&p=" + (i - 1) + "'>" + i + "</a>" + strbe;
                    }
                }
                if (pp <= 1) { strbe = ""; } else { strbe = "<a class='num' href='" + url + "&p=0'>首页</a>" + "<a class='num' href='" + url + "&p=" + (pp - 2) + "'>上一页</a>" + strbe; }
                String strmid = "<span class='current'>" + pp + "</span>";
                String strlater = "";
                int pagelater = pp + beforlaterln;
                for (int i = pp; i < pagelater; i++)
                {
                    if (i < countpage)
                    {
                        strlater += "<a class='num' href='" + url + "&p=" + (i) + "'>" + (i + 1) + "</a>";
                    }
                }
                if (pp >= countpage) { } else { strlater += "<a class='num' href='" + url + "&p=" + pp + "'>下一页</a>" + "<a class='num' href='" + url + "&p=" + (countpage - 1) + "'>尾页</a>"; }
                page = strbe + strmid + strlater;
            }
            return "共" + countpage + "页" + page;
        }
        static void Main(string[] args)
        {
            Program pg = new Program();
            String str = pg.pagestr("http://www.abc.com?", 195, 11, 10, 8);
            Console.WriteLine(str);
        }
    }
}

共20页<a class='num' href='http://www.abc.com?&p=0'>首页</a>
<a class='num' href='http://www.abc.com?&p=10'>上一页</a>
<a class='num' href='http://www.abc.com?&p=3'>4</a>
<a class='num' href='http://www.abc.com?&p=4'>5</a>
<a class='num' href='http://www.abc.com?&p=5'>6</a>
<a class='num' href='http://www.abc.com?&p=6'>7</a>
<a class='num' href='http://www.abc.com?&p=7'>8</a>
<a class='num' href='http://www.abc.com?&p=8'>9</a>
<a class='num' href='http://www.abc.com?&p=9'>10</a>
<a class='num' href='http://www.abc.com?&p=10'>11</a>
<span class='current'>12</span>
<a class='num' href='http://www.abc.com?&p=12'>13</a>
<a class='num' href='http://www.abc.com?&p=13'>14</a>
<a class='num' href='http://www.abc.com?&p=14'>15</a>
<a class='num' href='http://www.abc.com?&p=15'>16</a>
<a class='num' href='http://www.abc.com?&p=16'>17</a>
<a class='num' href='http://www.abc.com?&p=17'>18</a>
<a class='num' href='http://www.abc.com?&p=18'>19</a>
<a class='num' href='http://www.abc.com?&p=19'>20</a>
<a class='num' href='http://www.abc.com?&p=12'>下一页</a>
<a class='num' href='http://www.abc.com?&p=19'>尾页</a>