以前一直用的別人的分頁控件今天自己寫了個方便自己（更新）使用正則表達式處理URL參數

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Web;
namespace OurQu.Helper.WebHelper
{
    using System.Text.RegularExpressions;

    using OurQu.Helper.Tools;

    public class PageHelper
    {
        /// <summary>
        /// 每頁顯示幾條記錄
        /// </summary>
        public int PageSize { get; set; }
        /// <summary>
        /// 當前頁碼
        /// </summary>
        public int CurrentPage { get; set; }
        /// <summary>
        /// 總記錄數
        /// </summary>
        public int Total { get; set; }
        /// <summary>
        /// 總頁碼
        /// </summary>
        public int PageTotal { get; set; }
        /// <summary>
        /// 當前URL地址
        /// </summary>
        public string Url { get; set; }
        /// <summary>
        /// url參數
        /// </summary>
        public string Partem { get; set; }

        public IEnumerable<object> Data { get; set; }

        public PageHelper() { }

        public PageHelper(int Count, int SelectPage, int? pageSize)
        {
            //判斷當前的頁碼
            Url = HttpContext.Current.Request.Url.ToString();
            if (SelectPage != 1)
                CurrentPage = SelectPage;
            else
                CurrentPage = 1;
            //一共有多少條記錄
            Total = Count;
            //每頁顯示的記錄
            PageSize = pageSize ?? 10;
            var FontArea = Url.IndexOf("?");

            Partem = FontArea != -1 ? Url.Substring(FontArea) : "";
            //計算總頁數
            PageTotal = (PageSize + Total - 1) / PageSize;
        }
        /// <summary>
        /// 判斷頁碼
        /// </summary>
        /// <param name="page"></param>
        /// <returns></returns>
        public string SelectedNum(int page)
        {
            if (CurrentPage != page)
                return "<a href='" + Url + page + "'>" + page.ToString() + "</a>";
            else
                return "<a href='#' class='pageulNow' >" + page.ToString() + "</a>";
        }

        public string FormatPager()
        {
            StringBuilder str = new StringBuilder();

            string temp = Regex.Replace(Url, @"((&)((?:page))|((?:page)))(=)(\d)", "");
            //處理參數的時候用了正則表達式匹配page=Num || &page=Num
            if (Partem.Length > 0)
                temp += "&page=";
            else
                temp += "?page=";
            //這邊做了個小處理。。實在沒想出來更簡單的
            Url = Regex.Replace(temp, "(\\?)(&)", "?");
            str.Append("<div id='pageContainer' <div class ='pageul'> ");
            if (CurrentPage > 1)
            {
                str.Append(string.Format("<a href='{0}1'>首頁</a>", Url));
                str.Append(string.Format("<a href='{0}{1}'>上一頁</a>", Url, (CurrentPage - 1).ObjToInt()));
            }
            ///偏移的起始位置
            int startPage = CurrentPage > 7 ? CurrentPage - 7 : 1;
            ///偏移的結束位置
            int stopPage = CurrentPage < PageTotal - 7 ? CurrentPage + 7 : PageTotal;
            if (PageTotal > 1)
            {
                for (int item = startPage; item < stopPage + 1; item++)
                    str.Append(SelectedNum(item));
            }
            if (CurrentPage < PageTotal)
            {
                //str.Append("<a href='" + Url + Convert.ToInt32(CurrentPage + 1) + "' >下一頁</a>");
                str.Append(string.Format("<a href='{0}'>下一頁</a>", Url + (CurrentPage + 1).ObjToInt()));
                str.Append(string.Format("<a href='{0}{1}'>尾頁</a>", Url, PageTotal));
            }
            //str.Append("<a> " + CurrentPage + "/" + PageTotal + "</span>頁</a>");
            str.Append(string.Format("<a> {0}/{1}</span>頁</a>", CurrentPage, PageTotal));
            str.Append(string.Format("共 {0} 條記錄", Total));
            str.Append("</div></div>");
            return str.ToString();
        }
    }
}