关于Mvc的分页写法

关于asp.net mvc的分页，网上已经有很多了。本来也想借用，先看了杨涛写的分页控件，感觉用起来稍微有点复杂，而我只需要简单的分页。分页我写过很多次，原理也熟悉，就是构造首页、上一页、下一页及末页的链接，做得好点，还可以有页码、下拉分页等。于是我又造了一个轮子。

先准备数据，这里以人员信息为例：

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public class PersonInfo

    {

        public string Name { get; set; }

        public int Age { get; set; }

    }

初始化100条数据，并提供一个方法，可以从这些数据中按照分页大小和页码获取。

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public class PersonHelper

{

    private static List<PersonInfo> list;

    static PersonHelper()

    {

        list = new List<PersonInfo>();

        for (int i = 0; i < 100; i++)

        {

            list.Add(new PersonInfo()

            {

                Name = "姓名" + i.ToString(),

                Age = 18 + i

            });

        }

    }

    /// <summary>

    ///

    /// </summary>

    /// <returns></returns>

    public static IEnumerable<PersonInfo> GetList(int pageSize, int pageIndex)

    {

        return list.Skip((pageIndex - 1) * pageSize).Take(pageSize);

    }

}

Model定义：其中包含了分页大小、当前页码、记录数和人员信息集合。

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using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using MvcApplication2.Code;

namespace MvcApplication2.Models

{

    public class PersonListModels

    {

        public int PageIndex { get; set; }

        public int PageSize { set; get; }

        public int RecordCount { get; set; }

        public IEnumerable<PersonInfo> Persons { get; set; }

    }

}

Controller中的处理：

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public ActionResult PersonList(int? pageIndex)

        {

            // 分页大小

            int pageSize = 10;

            // 获取分页页码

            if (pageIndex == null || pageIndex <= 0)

            {

                pageIndex = 1;

            }

            // 获取分页数据

            IEnumerable<PersonInfo> query = PersonHelper.GetList(pageSize, pageIndex.Value);

            // 设置模型

            NewsModels model = new NewsModels()

            {

                Persons = query,

                PageIndex = pageIndex.Value,

                PageSize = pageSize,

                RecordCount = 100

            };

            return View(model);

        }

View中处理：

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@model MvcApplication2.Models.PersonListModels

@{

    ViewBag.Title = "Person List";

}

<h2>

    Person List</h2>

<table>

    @foreach (MvcApplication2.Code.PersonInfo info in Model.Persons)

    {

        <tr>

            <td>@info.Name

            </td>

            <td>@info.Age

            </td>

        </tr>

    }

    <tr>

        <td colspan="2">

            @Url.Pager("Home", "PersonList", Model.PageSize, Model.PageIndex, Model.RecordCount)

        </td>

    </tr>

</table>

重点就在@Url.Pager的使用了。扩展UrlHelper的代码如下：

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namespace System.Web.Mvc

{

    public static class HtmlExtend

    {

        /// <summary>

        /// 扩展UrlHelper，实现输出分页HTML

        /// </summary>

        /// <param name="urlHelper"></param>

        /// <param name="controllerName">控制器名</param>

        /// <param name="actionName">行为名</param>

        /// <param name="pageSize">分页大小</param>

        /// <param name="pageIndex">当前页码</param>

        /// <param name="recordCount">总记录数</param>

        /// <returns></returns>

        public static MvcHtmlString Pager(this UrlHelper urlHelper, string controllerName, string actionName, int pageSize, int pageIndex, int recordCount)

        {

            // 如果分页大小等于0，则返回空字符串

            if (pageSize == 0)

            {

                return MvcHtmlString.Create(string.Empty);

            }

            // 根据总记录数和分页大小计算出分页数量

            int pageCount = (int)decimal.Ceiling((decimal)recordCount / (decimal)pageSize);

            // 首页、末页

            string firstStr = string.Empty;

            string lastStr = string.Empty;

            if (recordCount > 0)

            {

                string firstUrl = urlHelper.Action(actionName, controllerName, new { pageIndex = 1 });

                firstStr = "<a href='" + firstUrl + "'>首页</a>";

                string lastUrl = urlHelper.Action(actionName, controllerName, new { pageIndex = pageCount });

                lastStr = "<a href='" + lastUrl + "'>末页</a>";

            }

            else

            {

                firstStr = "首页";

                lastStr = "末页";

            }

            // 上一页

            string preStr = string.Empty;

            if (pageIndex > 1 && pageIndex <= pageCount)

            {

                string prevUrl = urlHelper.Action(actionName, controllerName, new { pageIndex = pageIndex - 1 });

                preStr = "<a href='" + prevUrl + "'>上一页</a>";

            }

            else

            {

                preStr = "上一页";

            }

            // 下一页

            string nextStr = string.Empty;

            if (pageIndex > 0 && pageIndex < pageCount)

            {

                string nextUrl = urlHelper.Action(actionName, controllerName, new { pageIndex = pageIndex + 1 });

                nextStr = "<a href='" + nextUrl + "'>下一页</a>";

            }

            else

            {

                nextStr = "下一页";

            }

            // 页码

            string numStr = string.Empty;

            if (pageCount > 0)

            {

                // 遍历输出全部的页码

                for (int i = 1; i <= pageCount; i++)

                {

                    string numUrl = urlHelper.Action(actionName, controllerName, new { pageIndex = i });

                    // 当前页码加粗

                    if (i == pageIndex)

                    {

                        numStr += "[<a href='" + numUrl + "'><strong>" + i + "</strong></a>] ";

                    }

                    else

                    {

                        numStr += "[<a href='" + numUrl + "'>" + i + "</a>] ";

                    }

                }

            }

            string pageStr = firstStr + " " + preStr + " " + numStr + nextStr + " " + lastStr;

            return MvcHtmlString.Create(pageStr);

        }

    }

}

看看效果：

这个扩展没有实现页码分段显示，有兴趣的朋友可以自己试试。

文章来源：http://blog.bossma.cn/asp_net_mvc/asp-net-mvc-url-pager/