MVC——分页

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

namespace System.Web.Mvc
{
    public static class PageBar
    {
        public static HtmlString ShowPageNavigate(this HtmlHelper htmlHelper, int currentPage, int pageSize, int totalCount)
        {
            var output = new StringBuilder();

            var redirectTo = htmlHelper.ViewContext.RequestContext.HttpContext.Request.Url.AbsolutePath;
            pageSize = pageSize == 0 ? 10 : pageSize;
            var totalPages = Math.Max((totalCount + pageSize - 1) / pageSize, 1); //总页数
           int  MaxPagerCount = 10;
           int visibleStartMax=1;
           if (totalPages > MaxPagerCount)
           {
                visibleStartMax = totalPages - (MaxPagerCount - 1);

           }
           int visibleStart = currentPage - MaxPagerCount / 2;//起始页
           if (visibleStart < 1)
           {
               visibleStart = 1;
           }
           if (visibleStart > visibleStartMax)
           {
               visibleStart = visibleStartMax;
           }
           int visibleEnd = visibleStart + MaxPagerCount-1;//结束页码
           //如果算出来的结束页码大于总页码的话则调整为最大页码
           if (visibleEnd > totalPages)
           {
               visibleEnd = totalPages;
           }
           if (currentPage == 1)
           {
               output.Append("<span>首页</span>");
               output.Append(" ");
               output.Append("<span>上一页</span>");
               output.Append(" ");
           }
      
            if (currentPage > 1)
            {
                output.AppendFormat("<a class=‘pageLink‘ href=‘{0}?pageIndex=1&pageSize={1}‘>首页</a> ", redirectTo, pageSize);
                //处理上一页的连接
                output.AppendFormat("<a class=‘pageLink‘ href=‘{0}?pageIndex={1}&pageSize={2}‘>上一页</a> ", redirectTo, currentPage - 1, pageSize);
            }
            output.Append(" ");
              //绘制可视的页码链接
            for (int i = visibleStart; i <= visibleEnd; i++)
            {
                //当前页不是超链接
                if (i == currentPage)
                {
                    output.Append("<span>").Append(i).Append("</span>");
                }
                else   //一般页处理
                {
                    output.AppendFormat("<a class=‘pageLink‘ href=‘{0}?pageIndex={1}&pageSize={2}‘>{3}</a> ", redirectTo, i, pageSize, i);
                }
                output.Append(" ");
            }
            if (currentPage < totalPages)
            {
                output.AppendFormat("<a class=‘pageLink‘ href=‘{0}?pageIndex={1}&pageSize={2}‘>下一页</a> ", redirectTo, currentPage + 1, pageSize);
                output.Append(" ");
                output.AppendFormat("<a class=‘pageLink‘ href=‘{0}?pageIndex={1}&pageSize={2}‘>末页</a> ", redirectTo, totalPages, pageSize);
                output.Append(" ");
            }
            else
            {
                output.Append("<span>下一页</span>");
                output.Append(" ");
                output.Append("<span>末页</span>");
                output.Append(" ");
            }
            output.AppendFormat("第{0}页 / 共{1}页", currentPage, totalPages);//这个统计加不加都行

            return new HtmlString(output.ToString());

        }
    }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using MvcApplicationStudy.Models;
namespace MvcApplicationStudy.Controllers
{
    public class AjaxController : Controller
    {
        //
        // GET: /Ajax/

        public ActionResult Index()
        {
            return View();
        }
    
        //分页
        public ActionResult ShowUserInfoList()
        {
            TestEntities db = new TestEntities();
            int pageIndex;
            if(!int.TryParse(Request["pageIndex"],out pageIndex ))
            {
                pageIndex = 1;
            }
            int pageSize = 1;
            int totalCount = db.UserInfo.Count();
            int pageCount = Convert.ToInt32(Math.Ceiling((double)totalCount / pageSize));
            if (pageIndex < 1)
                pageIndex = 1;
            if (pageIndex > pageCount)
                pageIndex = pageCount;
            var userInfoList = db.UserInfo.Where<UserInfo>(u => true).OrderBy<UserInfo, int>(u => u.ID).Skip<UserInfo>((pageIndex - 1) * pageSize).Take<UserInfo>(pageSize);
            List<UserInfo> list = userInfoList.ToList();
            ViewData.Model = list;
            ViewBag.PageIndex = pageIndex;
            ViewBag.PageSize = pageSize;
            ViewBag.PageCount = pageCount;
            ViewBag.TotalCount = totalCount;

            return View();

        }
    }
}

@model  IEnumerable<MvcApplicationStudy.Models.UserInfo>
@{
    Layout = null;
}

<!DOCTYPE html>

<html>
<head>
    <meta name="viewport" content="width=device-width" />
    <title>ShowUserInfoList</title>
</head>
<body>
    <div>
        <table>
            <tr><th>@Html.DisplayNameFor(model=>model.UserName)</th>
                <th>@Html.DisplayNameFor(model=>model.UserPwd)</th>
                <th>@Html.DisplayNameFor(model=>model.RegTime)</th></tr>
            @foreach (var item in Model)
            {
<tr><td>@Html.DisplayFor(modelItem=>item.UserName)</td>
    <td>@Html.DisplayFor(modelItem=>item.UserPwd )</td>
    <td>@Html.DisplayFor(modelItem=>item.RegTime )</td>

</tr>
            }
        </table>
        @for (int i = 1; i <= (int)@ViewBag.PageCount; i++)
        {
            @Html.ActionLink(i.ToString(), "ShowUserInfoList", new { pageIndex=i});
        }
        <br />
        <br />
        @Html.ShowPageNavigate((int)ViewBag.PageIndex,(int)ViewBag.PageSize,(int)ViewBag.TotalCount);
    </div>
</body>
</html>