構建ASP.NET MVC4+EF5+EasyUI+Unity2.x注入的後臺管理系統（8）-MVC與EasyUI DataGrid 分頁

時間  2019-11-19
標籤 構建 asp.net asp mvc4+ef5+easyui+unity2.x mvc easyui unity 注入 後臺 管理 系統 datagrid 分頁 欄目 ASP 简体版
原文   原文鏈接

系列目錄html

前言

爲了符合後面更新後的重構系統，文章於2016-11-1日重寫json

EasyUI Datagrid在加載的時候會提交一些分頁的信息到後臺，咱們須要根據這些信息來進行數據分頁再次返回到前臺ide

實現

首先要讓DataGrid支持分頁，咱們須要在JS Datagrid中加入下列幾個屬性post

  1. 是否啓用分頁：pagination 默認是false
  2. 每頁數量：pageSize 默認10
  3. 可選擇每頁數量：pageList 默認[10,20,30,40,50]
  4. 排序字段：sortName 默認null
  5. 排序類型：sortOrder 默認asc

OK加入後的代碼變成這樣url

  $(function () {
        $('#List').datagrid({
            url: '/SysSample/GetList',
            width: $(window).width() - 10,
            methord: 'post',
            height: $(window).height() - 35,
            fitColumns: true,
            sortName: 'Id',
            sortOrder: 'desc',
            idField: 'Id',
            pageSize: 15,
            pageList: [15, 20, 30, 40, 50],
            pagination: true,
            striped: true, //奇偶行是否區分
            singleSelect: true,//單選模式
            rownumbers: true,//行號
            columns: [[
                { field: 'Id', title: 'ID', width: 80 },
                { field: 'Name', title: '名稱', width: 120 },
                { field: 'Age', title: '年齡', width: 80, align: 'right' },
                { field: 'Bir', title: '生日', width: 80, align: 'right' },
                { field: 'Photo', title: '照片', width: 250 },
                { field: 'Note', title: '說明', width: 60, align: 'center' },
                { field: 'CreateTime', title: '建立時間', width: 60, align: 'center' }
            ]]
        });
    });
Index

預覽一下spa

實際已經分頁，可是不正確的，每一頁的數據同樣。咱們要根據分頁的參數去取code

查看技巧

OK咱們控制器要根據他傳遞的參數寫一樣的參數名稱，不然獲取不到htm

看咱們的SysSampleController 下的GetList方法，加入參數blog

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using App.BLL;
using App.IBLL;
using App.Models;
using App.Models.Sys;
using Microsoft.Practices.Unity;

namespace App.Admin.Controllers
{
    public class SysSampleController : Controller
    {
        //
        // GET: /SysSample/
        /// <summary>
        /// 業務層注入
        /// </summary>
        [Dependency]
        public ISysSampleBLL m_BLL { get; set; }
        public ActionResult Index()
        {
            
            return View();
        }
        [HttpPost]
        public JsonResult GetList(int page = 1, int rows = 10, string sort = "Id", string order = "desc")
        {
            int total = 0;
            List<SysSampleModel> list = m_BLL.GetList(page, rows, sort, order, ref total);
            var json = new
            {
                total = total,
                rows = (from r in list
                        select new SysSampleModel()
                        {

                            Id = r.Id,
                            Name = r.Name,
                            Age = r.Age,
                            Bir = r.Bir,
                            Photo = r.Photo,
                            Note = r.Note,
                            CreateTime = r.CreateTime,

                        }).ToArray()
            };
            return Json(json, JsonRequestBehavior.AllowGet);
        }
    }
}
SysSampleController

BLL代碼修改（IBLL也要修改參數 List<SysSampleModel> GetList(int page, int rows, string sort, string order,ref int total);）排序

using System;
using System.Collections.Generic;
using System.Linq;
using Microsoft.Practices.Unity;
using App.Models;
using App.Common;
using App.Models.Sys;
using App.IBLL;
using App.IDAL;


namespace App.BLL
{
    public class SysSampleBLL : ISysSampleBLL
    {
        DBContainer db = new DBContainer();
        [Dependency]
        public ISysSampleRepository Rep { get; set; }
        /// <summary>
        /// 獲取列表
        /// </summary>
        /// <param name="pager">JQgrid分頁</param>
        /// <param name="queryStr">搜索條件</param>
        /// <returns>列表</returns>
        public List<SysSampleModel> GetList(int page, int rows, string sort, string order, ref int total)
        {
            IQueryable<SysSample> queryData = null;
            queryData = Rep.GetList(db);
            
            //排序
            if (order == "desc")
            {
                switch (order)
                {
                    case "Id":
                        queryData = queryData.OrderByDescending(c => c.Id);
                        break;
                    case "Name":
                        queryData = queryData.OrderByDescending(c => c.Name);
                        break;
                    default:
                        queryData = queryData.OrderByDescending(c => c.CreateTime);
                        break;
                }
            }
            else
            {

                switch (order)
                {
                    case "Id":
                        queryData = queryData.OrderBy(c => c.Id);
                        break;
                    case "Name":
                        queryData = queryData.OrderBy(c => c.Name);
                        break;
                    default:
                        queryData = queryData.OrderBy(c => c.CreateTime);
                        break;
                }
            }
            return CreateModelList(ref queryData,page,rows,ref total);
        }


        private List<SysSampleModel> CreateModelList(ref IQueryable<SysSample> queryData,int page,int rows,ref int total)
        {

            total = queryData.Count();
            if (total > 0)
            {
                if (page <= 1)
                {
                    queryData = queryData.Take(rows);
                }
                else
                {
                    queryData = queryData.Skip((page - 1) * rows).Take(rows);
                }
            }
            List<SysSampleModel> modelList = (from r in queryData
                                              select new SysSampleModel
                                              {
                                                  Id = r.Id,
                                                  Name = r.Name,
                                                  Age = r.Age,
                                                  Bir = r.Bir,
                                                  Photo = r.Photo,
                                                  Note = r.Note,
                                                  CreateTime = r.CreateTime,

                                              }).ToList();

            return modelList;
        }

        /// <summary>
        /// 建立一個實體
        /// </summary>
        /// <param name="errors">持久的錯誤信息</param>
        /// <param name="model">模型</param>
        /// <returns>是否成功</returns>
        public bool Create( SysSampleModel model)
        {
            try
            {
                SysSample entity = Rep.GetById(model.Id);
                if (entity != null)
                {
                    return false;
                }
                entity = new SysSample();
                entity.Id = model.Id;
                entity.Name = model.Name;
                entity.Age = model.Age;
                entity.Bir = model.Bir;
                entity.Photo = model.Photo;
                entity.Note = model.Note;
                entity.CreateTime = model.CreateTime;

                if (Rep.Create(entity) == 1)
                {
                    return true;
                }
                else
                {
                    return false;
                }
            }
            catch (Exception ex)
            {
                //ExceptionHander.WriteException(ex);
                return false;
            }
        }
        /// <summary>
        /// 刪除一個實體
        /// </summary>
        /// <param name="errors">持久的錯誤信息</param>
        /// <param name="id">id</param>
        /// <returns>是否成功</returns>
        public bool Delete(string id)
        {
            try
            {
                if (Rep.Delete(id) == 1)
                {
                    return true;
                }
                else
                {
                    return false;
                }
            }
            catch (Exception ex)
            {
                return false;
            }
        }
   
        /// <summary>
        /// 修改一個實體
        /// </summary>
        /// <param name="errors">持久的錯誤信息</param>
        /// <param name="model">模型</param>
        /// <returns>是否成功</returns>
        public bool Edit(SysSampleModel model)
        {
            try
            {
                SysSample entity = Rep.GetById(model.Id);
                if (entity == null)
                {
                    return false;
                }
                entity.Name = model.Name;
                entity.Age = model.Age;
                entity.Bir = model.Bir;
                entity.Photo = model.Photo;
                entity.Note = model.Note;


                if (Rep.Edit(entity) == 1)
                {
                    return true;
                }
                else
                {

                    return false;
                }

            }
            catch (Exception ex)
            {

                //ExceptionHander.WriteException(ex);
                return false;
            }
        }
        /// <summary>
        /// 判斷是否存在實體
        /// </summary>
        /// <param name="id">主鍵ID</param>
        /// <returns>是否存在</returns>
        public bool IsExists(string id)
        {
            if (db.SysSample.SingleOrDefault(a => a.Id == id) != null)
            {
                return true;
            }
            return false;
        }
        /// <summary>
        /// 根據ID得到一個實體
        /// </summary>
        /// <param name="id">id</param>
        /// <returns>實體</returns>
        public SysSampleModel GetById(string id)
        {
            if (IsExist(id))
            {
                SysSample entity = Rep.GetById(id);
                SysSampleModel model = new SysSampleModel();
                model.Id = entity.Id;
                model.Name = entity.Name;
                model.Age = entity.Age;
                model.Bir = entity.Bir;
                model.Photo = entity.Photo;
                model.Note = entity.Note;
                model.CreateTime = entity.CreateTime;

                return model;
            }
            else
            {
                return new SysSampleModel();
            }
        }

        /// <summary>
        /// 判斷一個實體是否存在
        /// </summary>
        /// <param name="id">id</param>
        /// <returns>是否存在 true or false</returns>
        public bool IsExist(string id)
        {
            return Rep.IsExist(id);
        }
    }
}
SysSampleBLL

 咱們要在BLL層返回當前查詢的所有條數，還要返回當前頁得數據

補腦：ref關鍵字使參數按引用傳遞。其效果是，當控制權傳遞迴調用方法時，在方法中對參數所作的任何更改都將反映在該變量中。若要使用ref參數，則方法定義和調用方法都必須顯式使用ref關鍵字。

你們看出這樣太麻煩了，代碼太不漂亮了，咱們把經常使用的參數給封裝了。

分裝分頁

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

namespace App.Common
{
     public class GridPager
    {
 
      
         public int rows { get; set; }//每頁行數
         public int page { get; set; }//當前頁是第幾頁
         public string order { get; set; }//排序方式
         public string sord { get; set; }//排序列
         public int totalRows { get; set; }//總行數

         public int totalPages //總頁數
         {
             get
             {
                 return (int)Math.Ceiling((float)totalRows / (float)rows);
             }
         }
    }
}
GridPager

把這個類放到Apps.Common, 咱們的Apps.Common終於用到了
再次修改Controller的GetList

   [HttpPost]
        public JsonResult GetList(GridPager pager)
        {
            List<SysSampleModel> list = m_BLL.GetList(ref pager);
            var json = new
            {
                total = pager.totalRows,
                rows = (from r in list
                        select new SysSampleModel()
                        {

                            Id = r.Id,
                            Name = r.Name,
                            Age = r.Age,
                            Bir = r.Bir,
                            Photo = r.Photo,
                            Note = r.Note,
                            CreateTime = r.CreateTime,

                        }).ToArray()

            };

            return Json(json, JsonRequestBehavior.AllowGet);
        }
SysSampleController

和修改BLL的GetList 還要修改IBLL --List<SysSampleModel> GetList(ref GridPager pager);

using System;
using System.Collections.Generic;
using System.Linq;
using Microsoft.Practices.Unity;
using App.Models;
using App.Common;
using App.Models.Sys;
using App.IBLL;
using App.IDAL;


namespace App.BLL
{
    public class SysSampleBLL : ISysSampleBLL
    {
        DBContainer db = new DBContainer();
        [Dependency]
        public ISysSampleRepository Rep { get; set; }
        /// <summary>
        /// 獲取列表
        /// </summary>
        /// <param name="pager">JQgrid分頁</param>
        /// <param name="queryStr">搜索條件</param>
        /// <returns>列表</returns>
        public List<SysSampleModel> GetList(ref GridPager pager)
        {

            IQueryable<SysSample> queryData = null;
          
                queryData = Rep.GetList(db);

            //排序
            if (pager.order == "desc")
            {
                switch (pager.order)
                {
                    case "CreateTime":
                        queryData = queryData.OrderByDescending(c => c.CreateTime);
                        break;
                    case "Name":
                        queryData = queryData.OrderByDescending(c => c.Name);
                        break;
                    default:
                        queryData = queryData.OrderByDescending(c => c.CreateTime);
                        break;
                }
            }
            else
            {

                switch (pager.order)
                {
                    case "CreateTime":
                        queryData = queryData.OrderBy(c => c.CreateTime);
                        break;
                    case "Name":
                        queryData = queryData.OrderBy(c => c.Name);
                        break;
                    default:
                        queryData = queryData.OrderBy(c => c.CreateTime);
                        break;
                }
            }
            return CreateModelList(ref pager, ref queryData);
        }
        private List<SysSampleModel> CreateModelList(ref GridPager pager, ref IQueryable<SysSample> queryData)
        {

            pager.totalRows = queryData.Count();
            if (pager.totalRows > 0)
            {
                if (pager.page <= 1)
                {
                    queryData = queryData.Take(pager.rows);
                }
                else
                {
                    queryData = queryData.Skip((pager.page - 1) * pager.rows).Take(pager.rows);
                }
            }
            List<SysSampleModel> modelList = (from r in queryData
                                              select new SysSampleModel
                                              {
                                                  Id = r.Id,
                                                  Name = r.Name,
                                                  Age = r.Age,
                                                  Bir = r.Bir,
                                                  Photo = r.Photo,
                                                  Note = r.Note,
                                                  CreateTime = r.CreateTime,

                                              }).ToList();

            return modelList;
        }

        /// <summary>
        /// 建立一個實體
        /// </summary>
        /// <param name="errors">持久的錯誤信息</param>
        /// <param name="model">模型</param>
        /// <returns>是否成功</returns>
        public bool Create( SysSampleModel model)
        {
            try
            {
                SysSample entity = Rep.GetById(model.Id);
                if (entity != null)
                {
                    return false;
                }
                entity = new SysSample();
                entity.Id = model.Id;
                entity.Name = model.Name;
                entity.Age = model.Age;
                entity.Bir = model.Bir;
                entity.Photo = model.Photo;
                entity.Note = model.Note;
                entity.CreateTime = model.CreateTime;

                if (Rep.Create(entity) == 1)
                {
                    return true;
                }
                else
                {
                    return false;
                }
            }
            catch (Exception ex)
            {
                //ExceptionHander.WriteException(ex);
                return false;
            }
        }
        /// <summary>
        /// 刪除一個實體
        /// </summary>
        /// <param name="errors">持久的錯誤信息</param>
        /// <param name="id">id</param>
        /// <returns>是否成功</returns>
        public bool Delete(string id)
        {
            try
            {
                if (Rep.Delete(id) == 1)
                {
                    return true;
                }
                else
                {
                    return false;
                }
            }
            catch (Exception ex)
            {
                return false;
            }
        }
   
        /// <summary>
        /// 修改一個實體
        /// </summary>
        /// <param name="errors">持久的錯誤信息</param>
        /// <param name="model">模型</param>
        /// <returns>是否成功</returns>
        public bool Edit(SysSampleModel model)
        {
            try
            {
                SysSample entity = Rep.GetById(model.Id);
                if (entity == null)
                {
                    return false;
                }
                entity.Name = model.Name;
                entity.Age = model.Age;
                entity.Bir = model.Bir;
                entity.Photo = model.Photo;
                entity.Note = model.Note;


                if (Rep.Edit(entity) == 1)
                {
                    return true;
                }
                else
                {

                    return false;
                }

            }
            catch (Exception ex)
            {

                //ExceptionHander.WriteException(ex);
                return false;
            }
        }
        /// <summary>
        /// 判斷是否存在實體
        /// </summary>
        /// <param name="id">主鍵ID</param>
        /// <returns>是否存在</returns>
        public bool IsExists(string id)
        {
            if (db.SysSample.SingleOrDefault(a => a.Id == id) != null)
            {
                return true;
            }
            return false;
        }
        /// <summary>
        /// 根據ID得到一個實體
        /// </summary>
        /// <param name="id">id</param>
        /// <returns>實體</returns>
        public SysSampleModel GetById(string id)
        {
            if (IsExist(id))
            {
                SysSample entity = Rep.GetById(id);
                SysSampleModel model = new SysSampleModel();
                model.Id = entity.Id;
                model.Name = entity.Name;
                model.Age = entity.Age;
                model.Bir = entity.Bir;
                model.Photo = entity.Photo;
                model.Note = entity.Note;
                model.CreateTime = entity.CreateTime;

                return model;
            }
            else
            {
                return new SysSampleModel();
            }
        }

        /// <summary>
        /// 判斷一個實體是否存在
        /// </summary>
        /// <param name="id">id</param>
        /// <returns>是否存在 true or false</returns>
        public bool IsExist(string id)
        {
            return Rep.IsExist(id);
        }
    }
}
SysSampleBLL

代碼漂亮了很多，預覽一下，仍是正確的效果了。

總結

文章中一直演示作法，這種方式看起來很是反感，可是都是爲了更好更仔細的瞭解系統，爲後面快速開發作鋪墊

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