PagedList.MVC 应用

Posted 2020-06-13

1. NuGet 下载 PagedList.MVC 

2. View Page

@model PagedList.IPagedList<Libaray.Models.Entities.BookModel>
@using PagedList.Mvc;
@{
    Layout = "~/Views/Shared/_Layout.cshtml";
}

<script type="text/javascript">
    $(function () {

        $("#txtSearch").val(@Request.QueryString["keyWords"]);

    })
</script>

<div class="row" style="margin-top:20px;">
    <div class="col-sm-2">
        @Html.Partial("_AccountNavigator")
    </div>
    <div class="col-sm-10">
        <div class="row">
            <div class="col-sm-6">
                <a class="btn btn-sm btn-primary" href="/Book/NewBook">新增</a>
            </div>
            <div class="col-sm-6 ">
                <form id="formSearch" method="get" class="form-horizontal">
                    <div class="input-group text-right">
                        @Html.TextBox("keyWords",ViewBag.KeyWords as string, new { @name= "keyWords",@class = "form-control", @placeholder = "书名/作者/描述..." })
                        <div class="input-group-btn">
                            <button id="search" class="btn btn-sm btn-primary">查询</button>
                        </div>
                    </div>
                </form>
            </div>
        </div>

        <hr />
        <div class="table-responsive">
            <table class="table table-striped table-hover">
                <thead>
                    <tr>
                        <th>图书名称</th>
                        <th>作者</th>
                        <th>描述</th>
                        <th>生产日期</th>
                        <th>录入时间</th>
                        <th>Action</th>
                    </tr>
                </thead>
                <tbody>
                    @foreach (var item in Model)
                    {
                        <tr>
                            <td>@Html.DisplayFor(m => item.BookName)</td>
                            <td>@Html.DisplayFor(m => item.Author)</td>
                            <td>@Html.DisplayFor(m => item.BookDescription)</td>
                            <td>@Html.DisplayFor(m => item.BookDate)</td>
                            <td>@Html.DisplayFor(m => item.CreatedOn)</td>
                            <td><a href="/Book/[email protected]">编辑</a></td>
                        </tr>
                    }
                </tbody>
            </table>
            @Html.PagedListPager(Model, id => Url.Action("BookList", new { id,keyWords=ViewBag.KeyWords }))
        </div>
    </div>
</div>

2. Book Controller

 // GET: Book
        public ActionResult BookList(int id=1,int irowCount=25, string keyWords =null)
        {
            BookService BookDAL = new BookService();
            ViewBag.KeyWords = keyWords;
            var sResult = BookDAL.SearchBookList(id, irowCount, keyWords);
            return View(sResult);
        }

public class BookService:BaseService<BookModel> //此处用到了Cache, 如果不需要则可跳过,
    {
        public IPagedList<BookModel> SearchBookList(int id = 1, int irowCount=20, string sKeyWords = null)
        {
            List<BookModel> sList = new List<BookModel>();
            if (WebCacheHelper.GetCache("BookList") == null)
            {
                using (LibContext = new LibarayContext())
                {
                    sList = LibContext.BookModels.ToList();
                    WebCacheHelper.SetCache("BookList", sList);
                }
            }
            else
            {
                 sList = WebCacheHelper.GetCache("BookList") as List<BookModel>;
            }

            if (!string.IsNullOrEmpty(sKeyWords))
            {
                var squery = from bk in sList where bk.Author.Contains(sKeyWords) || bk.BookName.Contains(sKeyWords) || bk.BookDescription.Contains(sKeyWords) select bk; //注意，如果Author, BookName, Description 为null, 此行会报错。

                return squery.OrderByDescending(u => u.UpdatedOn).ToPagedList(id, irowCount);
            }
            else
            {
                return sList.OrderByDescending(m => m.UpdatedOn).ToPagedList(id, irowCount);
            }
        }
}

 WebCacheHelper // 转载别人，具体出处忘记了。

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

namespace Libaray.Common
{
    public class WebCacheHelper
    {
        /// <summary>
        /// 缓存辅助类
        /// </summary>

        /// <summary>
        /// 获取数据缓存
        /// </summary>
        /// <param name="CacheKey">键</param>
        public static object GetCache(string CacheKey)
        {
            System.Web.Caching.Cache objCache = HttpRuntime.Cache;
            return objCache[CacheKey];
        }

        /// <summary>
        /// 设置数据缓存
        /// </summary>
        public static void SetCache(string CacheKey, object objObject)
        {
            System.Web.Caching.Cache objCache = HttpRuntime.Cache;
            objCache.Insert(CacheKey, objObject);
        }

        /// <summary>
        /// 设置数据缓存
        /// </summary>
        public static void SetCache(string CacheKey, object objObject, TimeSpan Timeout)
        {
            System.Web.Caching.Cache objCache = HttpRuntime.Cache;
            objCache.Insert(CacheKey, objObject, null, DateTime.MaxValue, Timeout, System.Web.Caching.CacheItemPriority.NotRemovable, null);
        }

        /// <summary>
        /// 设置数据缓存
        /// </summary>
        public static void SetCache(string CacheKey, object objObject, DateTime absoluteExpiration, TimeSpan slidingExpiration)
        {
            System.Web.Caching.Cache objCache = HttpRuntime.Cache;
            objCache.Insert(CacheKey, objObject, null, absoluteExpiration, slidingExpiration);
        }

        /// <summary>
        /// 移除指定数据缓存
        /// </summary>
        public static void RemoveAllCache(string CacheKey)
        {
            System.Web.Caching.Cache _cache = HttpRuntime.Cache;
            _cache.Remove(CacheKey);
        }

        /// <summary>
        /// 移除全部缓存
        /// </summary>
        public static void RemoveAllCache()
        {
            System.Web.Caching.Cache _cache = HttpRuntime.Cache;
            IDictionaryEnumerator CacheEnum = _cache.GetEnumerator();
            while (CacheEnum.MoveNext())
            {
                _cache.Remove(CacheEnum.Key.ToString());
            }
        }

    }
}