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目录

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介绍

在本文中，我将说明如何使用EF Core创建ASP.NET Core MVC Web应用程序。此应用程序的主要功能是创建CRUD操作、更快的分页、排序、搜索和导出数据到CSV、PDF、复制到剪贴板和打印数据。

完成本文后，您将学会如何使用EF Core和泛型存储库模式(Generic Repository Pattern)创建完整的AP.NET Core Web应用程序。此应用程序的主要优点是通过在前端实现jQuery Datatable来加快分页、排序和过滤操作。

先决条件

1. Visual Studio 2017
2. 安装.NET Core 2.0.0或更高版本的SDK
3. MSSQL Server 2008或更高版本

我使用的技术

1. ASP.NET Core
2. C＃
3. 泛型存储库模式(Generic Repository Pattern)
4. ASP.NET内置依赖注入
5. EF Core
6. LINQ
7. Razor标签助手
8. jQuery Datatable
9. jQuery UI
10. Sweetalert 2
11. Bootstrap
12. REST API

创建此项目的步骤

1、打开VS 2017并在Visual Studio 2017中创建ASP.NET Core Web应用程序：

2、从VS模板项目中选择MVC项目结构：

3、并为EF Core数据访问层创建ASP.NET Core类库项目。在这里，我使用泛型存储库模式(Generic Repository Pattern)进行应用程序数据访问。

4、整体项目结构：

5、项目主UI：

6、添加新数据的UI：

7、编辑数据的UI：

8、删除数据的UI：

9、从应用程序导出数据：

已安装的Nuget包

从Visual Studio菜单转到工具，然后单击NuGet包管理器。

Install-Package Microsoft.EntityFrameworkCore -Version 2.2.0Install-Package System.Linq.Dynamic.Core -Version 1.0.10Install-Package CsvHelperInstall-Package jquery.datatables -Version 1.10.15Install-Package jQuery -Version 3.4.1Install-Package jQuery.UI.Combined -Version 1.12.1

MSSQL表脚本

SET ANSI_NULLS ONGO SET QUOTED_IDENTIFIER ONGO CREATE TABLE [dbo].[PersonalInfo]( [ID] [bigint] IDENTITY(1,1) NOT NULL, [FirstName] [nvarchar](max) NULL, [LastName] [nvarchar](max) NULL, [DateOfBirth] [datetime2](7) NULL, [City] [nvarchar](max) NULL, [Country] [nvarchar](max) NULL, [MobileNo] [nvarchar](max) NULL, [NID] [nvarchar](max) NULL, [Email] [nvarchar](max) NULL, [CreatedDate] [datetime2](7) NULL, [LastModifiedDate] [datetime2](7) NULL, [CreationUser] [nvarchar](max) NULL, [LastUpdateUser] [nvarchar](max) NULL, [Status] [tinyint] NOT NULL, CONSTRAINT [PK_PersonalInfo] PRIMARY KEY CLUSTERED ( [ID] ASC)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, _ IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]) ON [PRIMARY] TEXTIMAGE_ON [PRIMARY] GO

在MSSQL数据库中创建MOC数据

使用以下SQL脚本，我创建了5个运气数据，用于测试应用程序数据加载，搜索和分页性能。jQuery Datatable通过分页从服务器端非常快速地呈现数据。

truncate table PersonalInfo---SQL loop insert DECLARE @ID int =0; DECLARE @StartDate AS DATETIME = '1980-01-01' WHILE @ID < 20BEGIN insert into PersonalInfo values('First Name ' + _CAST(@ID AS nvarchar),'Last Name ' + CAST(@ID AS VARCHAR),dateadd(day,1, @StartDate), 'City ' + CAST(@ID AS VARCHAR),'Country ' + CAST(@ID AS VARCHAR),_ ABS(CAST(NEWID() AS binary(12)) % 1000) + 5555, ABS(CAST(NEWID() AS binary(12)) % 1000) + 99998888,'email' + _    CAST(@ID AS nvarchar) +'@gmail.com',GETDATE(),null,'Admin' + CAST(@ID AS VARCHAR),null,1) SET @ID = @ID + 1; set @StartDate=dateadd(day,1, @StartDate) END

创建一个模型类

public class PersonalInfo     {        public long ID { get; set; }        [Required(ErrorMessage = "First Name is required.")]        [DisplayName("First Name")]        public string FirstName { get; set; }        [Required(ErrorMessage = "Last Name is required.")]        [DisplayName("Last Name")]        public string LastName { get; set; }        [DisplayName("Date Of Birth")]        [DisplayFormat(DataFormatString = "{0:yyyy-MM-dd}", ApplyFormatInEditMode = true)]        public Nullable
   
     DateOfBirth { get; set; }        public string City { get; set; }        public string Country { get; set; }        [DisplayName("Mobile No")]        public string MobileNo { get; set; }        public string NID { get; set; }        [EmailAddress]        public string Email { get; set; }        public DateTime? CreatedDate { get; set; }        public DateTime? LastModifiedDate { get; set; }        public string CreationUser { get; set; }        public string LastUpdateUser { get; set; }        public byte Status { get; set; }    }
   

数据库连接：appsettings.json

"ConnectionStrings": {    "MSSQLConn": "Server=DEVSTATION\\MSSQLSERVER2017;Database=DevTest;_     User ID=sa;Password=dev123456;"  }

Startup.cs

var connectionString = Configuration["ConnectionStrings:MSSQLConn"];            services.AddDbContext
   
    _            (options => options.UseSqlServer(connectionString));             services.AddTransient
    
     ();             services.AddMvc().AddJsonOptions(options =>            {                options.SerializerSettings.ContractResolver                = new Newtonsoft.Json.Serialization.DefaultContractResolver();            });
    
   

创建数据：Ajax请求

$.ajax({        type: "POST",        url: "/PersonalInfo/Create",        data: myformdata,        success: function (result) {            $("#PersonalInfoFormModel").modal("hide");             Swal.fire({                title: "Alert!",                text: result,                type: "Success"            }).then(function () {                $('#tblPersonalInfo').DataTable().ajax.reload();            });        },        error: function (errormessage) {            alert(errormessage.responseText);        }    });

数据表：JavaScript代码

项目中的文件位置：

~Sln.jQueryDatatables\jQueryDatatables\wwwroot\js\PersonalInfo\PersonalInfo_Datatable.js

$(document).ready(function () {    document.title = 'PersonalInfo DataTable';    $("#tblPersonalInfo").DataTable({        paging: true,        select: true,        "order": [[0, "desc"]],        dom: 'Bfrtip',         buttons: [            'pageLength',            {                extend: 'collection',                text: 'Export',                buttons: [                    {                        extend: 'pdfHtml5',                        customize: function (doc) {                            //doc.content[1].margin = [100, 0, 100, 0];                            //Remove the title created by datatTables                            doc.content.splice(0, 1);                            //Create a date string that we use in the footer.                             //Format is dd-mm-yyyy                            var now = new Date();                            var jsDate = now.getDate() + '-' +                                 (now.getMonth() + 1) + '-' + now.getFullYear();                             doc.pageMargins = [20, 60, 20, 30];                            // Set the font size fot the entire document                            doc.defaultStyle.fontSize = 7;                            // Set the fontsize for the table header                            doc.styles.tableHeader.fontSize = 10;                              doc['header'] = (function () {                                return {                                    columns: [                                        {                                            alignment: 'left',  //center                                            italics: true,                                            text: 'Personal Info',                                            fontSize: 18,                                            margin: [0, 0]                                        }                                    ],                                    margin: 20                                }                            });                             // Create a footer object with 2 columns                            doc['footer'] = (function (page, pages) {                                return {                                    columns: [                                        {                                            alignment: 'left',                                            text: ['Created on: ',                                                   { text: jsDate.toString() }]                                        },                                        {                                            alignment: 'right',                                            text: ['page ', { text: page.toString() }, '                                                     of ', { text: pages.toString() }]                                        }                                    ],                                    margin: 5                                }                            });                            // Change dataTable layout (Table styling)                            // To use predefined layouts uncomment the line below                             // and comment the custom lines below                            // doc.content[0].layout = 'lightHorizontalLines'; // noBorders,                                                                          // headerLineOnly                            var objLayout = {};                            objLayout['hLineWidth'] = function (i) { return .5; };                            objLayout['vLineWidth'] = function (i) { return .5; };                            objLayout['hLineColor'] = function (i) { return '#aaa'; };                            objLayout['vLineColor'] = function (i) { return '#aaa'; };                            objLayout['paddingLeft'] = function (i) { return 4; };                            objLayout['paddingRight'] = function (i) { return 4; };                            doc.content[0].layout = objLayout;                        },                          orientation: 'portrait', // landscape                        pageSize: 'A4',                        pageMargins: [0, 0, 0, 0], // try #1 setting margins                        margin: [0, 0, 0, 0], // try #2 setting margins                        text: 'PDF',                        key: { // press E for export PDF                            key: 'e',                            altKey: false                        },                        exportOptions: {                            columns: [0, 1, 2, 3, 4, 5], //column id visible in PDF                            modifier: {                                // DataTables core                                order: 'index',   // 'current', 'applied', 'index',  'original'                                page: 'all',      // 'all',     'current'                                search: 'none'    // 'none',    'applied', 'removed'                            }                        }                    },                    'copyHtml5',                    'excelHtml5',                    'csvHtml5',                    {                        extend: 'print',                        exportOptions: {                            columns: [0, 1, 2, 3, 4, 5],                            page: 'all'                        }                    }                ]            }        ],         "processing": true,        "serverSide": true,        "filter": true, //Search Box        "orderMulti": false,        "stateSave": true,         "ajax": {            "url": "/PersonalInfo/GetDataTabelData",            "type": "POST",            "datatype": "json"        },         "columns": [            { "data": "ID", "name": "ID", "autoWidth": true },            { "data": "FirstName", "name": "FirstName", "autoWidth": true },            {                "data": "DateOfBirth",                "name": "DateOfBirth",                "autoWidth": true,                "render": function (data) {                    var date = new Date(data);                    var month = date.getMonth() + 1;                    return (month.length > 1 ? month : "0" + month) + "/" +                                    date.getDate() + "/" + date.getFullYear();                }            },            { "data": "City", "name": "City", "autoWidth": true },            { "data": "Country", "name": "Country", "autoWidth": true },            { "data": "MobileNo", "name": "MobileNo", "autoWidth": true },            {                data: null, render: function (data, type, row) {                    return "Edit";                }            },            {                data: null, render: function (data, type, row) {                    return "Delete";                }            }        ],         'columnDefs': [{            'targets': [6, 7],            'orderable': false,        }],        "lengthMenu": [[10, 15, 25, 50, 100, 200], [10, 15, 25, 50, 100, 200]]    });});

数据表：C＃代码

 

[HttpPost]        public IActionResult GetDataTabelData()        {            try            {                var draw = HttpContext.Request.Form["draw"].FirstOrDefault();                var start = Request.Form["start"].FirstOrDefault();                var length = Request.Form["length"].FirstOrDefault();                 var sortColumn = Request.Form["columns[" +                        Request.Form["order[0][column]"].FirstOrDefault() + "]                                   [name]"].FirstOrDefault();                var sortColumnAscDesc = Request.Form["order[0][dir]"].FirstOrDefault();                var searchValue = Request.Form["search[value]"].FirstOrDefault();                 int pageSize = length != null ? Convert.ToInt32(length) : 0;                int skip = start != null ? Convert.ToInt32(start) : 0;                int resultTotal = 0;                 var personalInfoData = (from tblObj in _personalInfoRepository.GetAll()                                         select tblObj);                 //Sorting                if (!(string.IsNullOrEmpty(sortColumn) &&                            string.IsNullOrEmpty(sortColumnAscDesc)))                {                    personalInfoData = _personalInfoRepository.GetAll().                                  OrderBy(sortColumn + " " + sortColumnAscDesc);                }                 //Search                if (!string.IsNullOrEmpty(searchValue))                {                    personalInfoData = personalInfoData.Where                                 (t => t.FirstName.Contains(searchValue)                    || t.LastName.Contains(searchValue)                    || t.City.Contains(searchValue)                    || t.Country.Contains(searchValue)                    || t.MobileNo.Contains(searchValue));                }                 resultTotal = personalInfoData.Count();                var result = personalInfoData.Skip(skip).Take(pageSize).ToList();                return Json(new { draw = draw, recordsFiltered = resultTotal,                                    recordsTotal = resultTotal, data = result });             }            catch (Exception ex)            {                throw ex;            }         }

将所有数据导出为CSV

对于导出，我使用的所有数据的都是CSV helper。从Nuget库中，只需在PMC中按照以下命令安装CsvHelper：

Install-Package CsvHelper。

public FileStreamResult ExportAllDatatoCSV()        {            var personalInfoData = (from tblObj in                   _personalInfoRepository.GetAll() select tblObj).Take(100);            var result = Common.WriteCsvToMemory(personalInfoData);            var memoryStream = new MemoryStream(result);            return new FileStreamResult(memoryStream, "text/csv")                       { FileDownloadName = "Personal_Info_Data.csv" };        }

结论

这是一个使用ASP.NET .NET Core的非常基本的CRUD应用程序，但在数据操作方面有所进步。应用程序执行更快的数据加载操作，这是由jQuery Datatable实现的。应用程序在几秒钟内成功加载了5个运气虚拟数据。搜索、过滤和分页也非常快。为了将来的工作，我将在这个项目中实现登录模块。

谢谢你宝贵的时间。我希望你完全理解并喜欢我的文章。

参考

 

原文地址：

转载地址：http://hizhj.baihongyu.com/