整理 之前的动态分页

 

 

using System;
using System.Web;
using System.Text;

/// <summary>
/// Summary description for PageHelper
/// </summary>
public  class PageHelper
{
    /// <summary>
    /// 根据当前页码检查分页要显示那一段的分页页码,返回当前页面要显示的第一个页码
    /// </summary>
    /// <param name="curPage">当前页码</param>
    /// <returns></returns>
    private  int CheckPage(int curPage)
    {
        string curpage_str = curPage.ToString();
        int FirstpageChart = 0;
        if (curpage_str.Length == 1)
        {
            return 1;
        }
        else
        {
            string tml = curpage_str.Substring(0, curpage_str.Length - 1);
            FirstpageChart = Convert.ToInt32(tml);
            /**/
            /*如果当前是第十页（或二十页）就会有这些情况，本来要到前十页的却到了十到二十页
             * 当取得的页码第一位的值乘十后等于当前页码，就把取得的页码第一位减一后乘十返回
             * 否则就返回取得的页码第一位的值乘十的值
             */
            return FirstpageChart * 10 == curPage ? (curPage - 9) : (FirstpageChart * 10 + 1);
        }
    }
    /// <summary>
    /// 生成页面字符
    /// </summary>
    /// <param name="countPage">总页数</param>
    /// <param name="curPage">当前页</param>
    /// <param name="url">页面url地址如“xxx.aspx”</param>
    /// <returns></returns>
    public string HtmlPage(int curPage, int countPage, string url, string paramName)
    {
        StringBuilder htm = new StringBuilder();

        int lastpage = CheckPage(curPage);

        int Num = lastpage + 9;

        if (Num <= countPage)
        {
            for (int i = 0; i < 10; i++)
            {
                htm.AppendFormat("{0}", Format(lastpage + i, curPage, url, paramName));
            }
        }
        else if (Num > countPage)
        {
            int Count = countPage - (lastpage - 1) * 10;

            for (int i = 0; i < Count; i++)
            {
                htm.AppendFormat("{0}", Format(lastpage + i, curPage, url, paramName));
            }
        }
        return htm.ToString();
    }
    /// <summary>
    /// 格式化页码
    /// </summary>
    /// <param name="i">页码</param>
    /// <param name="curPage">当前页</param>
    /// <param name="url">页面url地址如“xxx.aspx”</param>
    /// <param name="paramName">参数名称</param>
    /// <returns></returns>
    protected virtual string Format(int i, int curPage, string url, string paramName)
    {
        return curPage == i ? string.Format("{0}&nbsp;", i) : string.Format("<a href='{0}?{1}={2}'>{3}</a>&nbsp;",
            url, paramName, i, i);
    }

}