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：

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。

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。

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：

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：

@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：

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); 

        } 

    } 

}