angular4和asp.net core 2 web api

angular4和asp.net core 2 web api

这是一篇学习笔记. angular 5 正式版都快出了, 不过主要是性能升级.

我认为angular 4还是很适合企业的, 就像.net一样.

我用的是windows 10

安装工具:

git for windows: 官网很慢, 所以找一个镜像站下载: https://github.com/waylau/git-for-win, 淘宝镜像的速度还是蛮快的:

安装的时候, 建议选择这个, 会添加很多命令行工具: 

nodejs: 去官网下载就行: https://nodejs.org/en/

正常安装即可. npm的版本不要低于5.0吧:

angular-cli, 官网: https://github.com/angular/angular-cli

npm install -g @angular/cli

visual studio code: https://code.visualstudio.com/

and visual studio 2017 of course.

建立angular项目

进入命令行在某个地方执行命令:

ng new client-panel

这就会建立一个client-panel文件夹, 里面是该项目的文件, 然后它会立即执行npm install命令(这里不要使用淘宝的cnpm进行安装, 有bug), 稍等一会就会结束.

使用vscode打开该目录, 然后在vscode里面打开terminal:

terminal默认的可能是powershell, 如果你感觉powershell有点慢的话, 可以换成bash(安装git时候带的)或者windows command line等.

第一次打开terminal的时候, vscode上方会提示你配置terminal, 这时就可以更换默认的terminal. 否则的话, 你可以点击菜单file-reference-settings, 自己选择一个terminal应用:

同样可以安装几个vscode的插件:

然后试运行一下项目, 在terminal执行 ng serve, 如果没问题的话, 大概是这样: 

浏览器运行: http://localhost:4200

安装bootstrap4等:

安装bootstrap4, tether, jquery等:

npm install bootstrap@4.0.0-beta.2 tether jquery --save

安装成功后, 打开 .angular-cli.json, 把相关的css和js添加进去:

然后在运行试试 ng serve, 刷新:

字体已经改变, bootstrap起作用了.

建立Components

建立dashboard:

terminal执行

ng g component components/dashboard

执行成功后会生成4个文件:

并且会自动在app.module.ts里面声明:

建立其他 components:

ng g component components/clients
ng g component components/clientDetails
ng g component components/addClient
ng g component components/editClient
ng g component components/navbar
ng g component components/sidebar
ng g component components/login
ng g component components/register
ng g component components/settings
ng g component components/pageNotFound

建立Route路由

import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';
import { RouterModule, Routes } from '@angular/router';

import { AppComponent } from './app.component';
import { DashboardComponent } from './components/dashboard/dashboard.component';
import { ClientsComponent } from './components/clients/clients.component';
import { ClientDetailsComponent } from './components/client-details/client-details.component';
import { AddClientComponent } from './components/add-client/add-client.component';
import { EditClientComponent } from './components/edit-client/edit-client.component';
import { NavbarComponent } from './components/navbar/navbar.component';
import { SidebarComponent } from './components/sidebar/sidebar.component';
import { LoginComponent } from './components/login/login.component';
import { RegisterComponent } from './components/register/register.component';
import { SettingsComponent } from './components/settings/settings.component';
import { PageNotFoundComponent } from './components/page-not-found/page-not-found.component';

const appRoutes: Routes = [
  { path: '', component: DashboardComponent },
  { path: 'register', component: RegisterComponent },
  { path: 'login', component: LoginComponent }
];

@NgModule({
  declarations: [
    AppComponent,
    DashboardComponent,
    ClientsComponent,
    ClientDetailsComponent,
    AddClientComponent,
    EditClientComponent,
    NavbarComponent,
    SidebarComponent,
    LoginComponent,
    RegisterComponent,
    SettingsComponent,
    PageNotFoundComponent
  ],
  imports: [
    BrowserModule,
    RouterModule.forRoot(appRoutes)
  ],
  providers: [],
  bootstrap: [AppComponent]
})
export class AppModule { }

添加router-outlet:

打开app.component.html, 清空内容, 添加一个div(可以输入div.container然后按tab健):

<div class="container">
  <router-outlet></router-outlet>
</div>

现在刷新浏览器, 大约这样:

添加navbar:

修改navbar.component.html:

<nav class="navbar navbar-expand-md navbar-light bg-light">
  <div class="container">
    <a class="navbar-brand" href="#">Client Panel</a>
    <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarsExampleDefault" aria-controls="navbarsExampleDefault"
      aria-expanded="false" aria-label="Toggle navigation">
      <span class="navbar-toggler-icon"></span>
    </button>

    <div class="collapse navbar-collapse" id="navbarsExampleDefault">
      <ul class="navbar-nav mr-auto">
        <li class="nav-item">
          <a class="nav-link" href="#" routerLink="/">Dashboard </a>
        </li>
      </ul>
      <ul class="navbar-nav ml-auto">
        <li class="nav-item">
          <a class="nav-link" href="#" routerLink="/register">Register </a>
        </li>
        <li class="nav-item">
          <a class="nav-link" href="#" routerLink="/login">Login </a>
        </li>
      </ul>
    </div>
  </div>
</nav>

修改app.component.html:

<app-navbar></app-navbar>
<div class="container">
  <router-outlet></router-outlet>
</div>

运行:

建立Service

建立一个client.service:

ng g service services/client

然后在app.module.ts添加引用:

// Services Imports
import { ClientService } from "./services/client.service";

并添加在providers里:

  providers: [
    ClientService
  ],

前端先暂时到这, 现在开始搞后端 web api.

建立asp.net core 2.0 的 Web api项目

web api项目源码: https://github.com/solenovex/asp.net-core-2.0-web-api-boilerplate

项目列表如图:

AspNetIdentityAuthorizationServer是一个单独的authorization server, 这里暂时还没用到, 它的端口是5000, 默认不启动.

CoreApi.Infrastructure 里面有一些基类和接口, 还放了一个公共的工具类等.

CoreApi.Models就是 models/entities

CoreApi.DataContext 里面就是DbContext相关的

CoreApi.Repositories 里面是Repositories

CoreApi.Services 里面就是各种services

CoreApi.ViewModels 里面就是各种ViewModels或者叫Dtos

CoreApi.Web是web启动项目.

SharedSettings是横跨authorization server和 web api的一些公共设置.

上面说的这些都没什么用, 下面开始建立Client的api.

建立Client Model(或者叫Entity)

在CoreApi.Models建立文件夹Angular, 然后建立Client.cs:

using CoreApi.Infrastructure.Features.Common;
using Microsoft.EntityFrameworkCore;
using Microsoft.EntityFrameworkCore.Metadata.Builders;

namespace CoreApi.Models.Angular
{
    public class Client : EntityBase
    {
        public decimal Balance { get; set; }
        public string Email { get; set; }
        public string FirstName { get; set; }
        public string LastName { get; set; }
        public string Phone { get; set; }
    }

    public class ClientConfiguration : EntityBaseConfiguration<Client>
    {
        public override void ConfigureDerived(EntityTypeBuilder<Client> builder)
        {
            builder.Property(x => x.Balance).HasColumnType("decimal(18,2)");
            builder.Property(x => x.Email).IsRequired().HasMaxLength(100);
            builder.Property(x => x.FirstName).IsRequired().HasMaxLength(50);
            builder.Property(x => x.LastName).IsRequired().HasMaxLength(50);
            builder.Property(x => x.Phone).HasMaxLength(50);
        }
    }
}

其中父类EntityBase里面含有一些通用属性,Id, CreateUser, UpdateUser, CreateTime, UpdateTime, LastAction, 这些是我公司做项目必须的, 你们随意.

下面ClientConfiguration是针对Client的fluent api配置类. 他的父类EntityBaseConfiguration实现了EF的IEntityTypeConfiguration接口, 并在父类里面针对EntityBase那些属性使用fluent api做了限制:

namespace CoreApi.Infrastructure.Features.Common
{
    public abstract class EntityBaseConfiguration<T> : IEntityTypeConfiguration<T> where T : EntityBase
    {
        public virtual void Configure(EntityTypeBuilder<T> builder)
        {
            builder.HasKey(e => e.Id);
            builder.Property(x => x.CreateTime).IsRequired();
            builder.Property(x => x.UpdateTime).IsRequired();
            builder.Property(x => x.CreateUser).IsRequired().HasMaxLength(50);
            builder.Property(x => x.UpdateUser).IsRequired().HasMaxLength(50);
            builder.Property(x => x.LastAction).IsRequired().HasMaxLength(50);

            ConfigureDerived(builder);
        }

        public abstract void ConfigureDerived(EntityTypeBuilder<T> b);
    }
}

弄完Model和它的配置之后, 就添加到DbContext里面. 打开CoreApi.DataContext的CoreContext, 添加Model和配置:

        protected override void OnModelCreating(ModelBuilder modelBuilder)
        {
            base.OnModelCreating(modelBuilder);
            modelBuilder.HasDefaultSchema(AppSettings.DefaultSchema);

            modelBuilder.ApplyConfiguration(new UploadedFileConfiguration());
            modelBuilder.ApplyConfiguration(new ClientConfiguration());
        }

        public DbSet<UploadedFile> UploadedFiles { get; set; }
        public DbSet<Client> Clients { get; set; }

然后建立ClientRepository

在CoreApi.Repositories里面建立Angular目录, 建立ClientRepository.cs:

namespace CoreApi.Repositories.Angular
{
    public interface IClientRepository : IEntityBaseRepository<Client> { }

    public class ClientRepository : EntityBaseRepository<Client>, IClientRepository
    {
        public ClientRepository(IUnitOfWork unitOfWork) : base(unitOfWork)
        {
        }
    }
}

图省事, 我把repository和它的interface放在一个文件了.

IEntityBaseRepository<T>定义了一些常用的方法:

namespace CoreApi.DataContext.Infrastructure
{
    public interface IEntityBaseRepository<T> where T : class, IEntityBase, new()
    {
        IQueryable<T> All { get; }
        IQueryable<T> AllIncluding(params Expression<Func<T, object>>[] includeProperties);

        int Count();
        Task<int> CountAsync();
        T GetSingle(int id);
        Task<T> GetSingleAsync(int id);
        T GetSingle(Expression<Func<T, bool>> predicate);
        Task<T> GetSingleAsync(Expression<Func<T, bool>> predicate);
        T GetSingle(Expression<Func<T, bool>> predicate, params Expression<Func<T, object>>[] includeProperties);
        Task<T> GetSingleAsync(Expression<Func<T, bool>> predicate, params Expression<Func<T, object>>[] includeProperties);
        IQueryable<T> FindBy(Expression<Func<T, bool>> predicate);
        void Add(T entity);
        void Update(T entity);
        void Delete(T entity);
        void DeleteWhere(Expression<Func<T, bool>> predicate);
        void AddRange(IEnumerable<T> entities);
        void DeleteRange(IEnumerable<T> entities);
        void Attach(T entity);
        void AttachRange(IEnumerable<T> entities);
        void Detach(T entity);
        void DetachRange(IEnumerable<T> entities);
        void AttachAsModified(T entity);
    }
}

EntityBaseRepository<T>是它的实现:

namespace CoreApi.DataContext.Infrastructure
{
    public class EntityBaseRepository<T> : IEntityBaseRepository<T>
        where T : class, IEntityBase, new()
    {
        #region Properties
        protected CoreContext Context { get; }

        public EntityBaseRepository(IUnitOfWork unitOfWork)
        {
            Context = unitOfWork as CoreContext;
        }
        #endregion

        public virtual IQueryable<T> All => Context.Set<T>();

        public virtual IQueryable<T> AllIncluding(params Expression<Func<T, object>>[] includeProperties)
        {
            IQueryable<T> query = Context.Set<T>();
            foreach (var includeProperty in includeProperties)
            {
                query = query.Include(includeProperty);
            }
            return query;
        }

        public virtual int Count()
        {
            return Context.Set<T>().Count();
        }

        public async Task<int> CountAsync()
        {
            return await Context.Set<T>().CountAsync();
        }

        public T GetSingle(int id)
        {
            return Context.Set<T>().FirstOrDefault(x => x.Id == id);
        }

        public async Task<T> GetSingleAsync(int id)
        {
            return await Context.Set<T>().FirstOrDefaultAsync(x => x.Id == id);
        }

        public T GetSingle(Expression<Func<T, bool>> predicate)
        {
            return Context.Set<T>().FirstOrDefault(predicate);
        }

        public async Task<T> GetSingleAsync(Expression<Func<T, bool>> predicate)
        {
            return await Context.Set<T>().FirstOrDefaultAsync(predicate);
        }

        public T GetSingle(Expression<Func<T, bool>> predicate, params Expression<Func<T, object>>[] includeProperties)
        {
            IQueryable<T> query = Context.Set<T>();
            foreach (var includeProperty in includeProperties)
            {
                query = query.Include(includeProperty);
            }
            return query.Where(predicate).FirstOrDefault();
        }

        public async Task<T> GetSingleAsync(Expression<Func<T, bool>> predicate, params Expression<Func<T, object>>[] includeProperties)
        {
            IQueryable<T> query = Context.Set<T>();
            foreach (var includeProperty in includeProperties)
            {
                query = query.Include(includeProperty);
            }

            return await query.Where(predicate).FirstOrDefaultAsync();
        }

        public virtual IQueryable<T> FindBy(Expression<Func<T, bool>> predicate)
        {
            return Context.Set<T>().Where(predicate);
        }

        public virtual void Add(T entity)
        {
            Context.Set<T>().Add(entity);
        }

        public virtual void Update(T entity)
        {
            EntityEntry<T> dbEntityEntry = Context.Entry(entity);
            dbEntityEntry.State = EntityState.Modified;

            dbEntityEntry.Property(x => x.Id).IsModified = false;
            dbEntityEntry.Property(x => x.CreateUser).IsModified = false;
            dbEntityEntry.Property(x => x.CreateTime).IsModified = false;
        }

        public virtual void Delete(T entity)
        {
            Context.Set<T>().Remove(entity);
        }

        public virtual void AddRange(IEnumerable<T> entities)
        {
            Context.Set<T>().AddRange(entities);
        }

        public virtual void DeleteRange(IEnumerable<T> entities)
        {
            foreach (var entity in entities)
            {
                Context.Set<T>().Remove(entity);
            }
        }

        public virtual void DeleteWhere(Expression<Func<T, bool>> predicate)
        {
            IEnumerable<T> entities = Context.Set<T>().Where(predicate);

            foreach (var entity in entities)
            {
                Context.Entry<T>(entity).State = EntityState.Deleted;
            }
        }
        public void Attach(T entity)
        {
            Context.Set<T>().Attach(entity);
        }

        public void AttachRange(IEnumerable<T> entities)
        {
            foreach (var entity in entities)
            {
                Attach(entity);
            }
        }

        public void Detach(T entity)
        {
            Context.Entry<T>(entity).State = EntityState.Detached;
        }

        public void DetachRange(IEnumerable<T> entities)
        {
            foreach (var entity in entities)
            {
                Detach(entity);
            }
        }

        public void AttachAsModified(T entity)
        {
            Attach(entity);
            Update(entity);
        }
        
    }
}

建立Client的ViewModels

在CoreApi.ViewModels建立Angular文件夹, 分别针对查询, 新增, 修改建立3个ViewModel(Dto):

ClientViewModel:

namespace CoreApi.ViewModels.Angular
{
    public class ClientViewModel : EntityBase
    {
        public decimal Balance { get; set; }
        public string Email { get; set; }
        public string FirstName { get; set; }
        public string LastName { get; set; }
        public string Phone { get; set; }
    }
}

ClientCreationViewModel:

namespace CoreApi.ViewModels.Angular
{
    public class ClientCreationViewModel
    {
        public decimal Balance { get; set; }
        
        [Required]
        [MaxLength(100)]
        public string Email { get; set; }
        
        [Required]
        [MaxLength(50)]
        public string FirstName { get; set; }
        
        [Required]
        [MaxLength(50)]
        public string LastName { get; set; }

        [Required]
        [MaxLength(50)]
        public string Phone { get; set; }
    }
}

ClientModificationViewModel:

namespace CoreApi.ViewModels.Angular
{
    public class ClientModificationViewModel
    {
        public decimal Balance { get; set; }

        [Required]
        [MaxLength(100)]
        public string Email { get; set; }

        [Required]
        [MaxLength(50)]
        public string FirstName { get; set; }

        [Required]
        [MaxLength(50)]
        public string LastName { get; set; }

        [Required]
        [MaxLength(50)]
        public string Phone { get; set; }
    }
}

配置AutoMapper

针对Client和它的Viewmodels, 分别从两个方向进行配置:

DomainToViewModelMappingProfile:

namespace CoreApi.Web.MyConfigurations
{
    public class DomainToViewModelMappingProfile : Profile
    {
        public override string ProfileName => "DomainToViewModelMappings";

        public DomainToViewModelMappingProfile()
        {
            CreateMap<UploadedFile, UploadedFileViewModel>();
            CreateMap<Client, ClientViewModel>();
            CreateMap<Client, ClientModificationViewModel>();
        }
    }
}

ViewModelToDomainMappingProfile:

namespace CoreApi.Web.MyConfigurations
{
    public class ViewModelToDomainMappingProfile : Profile
    {
        public override string ProfileName => "ViewModelToDomainMappings";

        public ViewModelToDomainMappingProfile()
        {
            CreateMap<UploadedFileViewModel, UploadedFile>();
            CreateMap<ClientViewModel, Client>();
            CreateMap<ClientCreationViewModel, Client>();
            CreateMap<ClientModificationViewModel, Client>();
        }
    }
}

注册Repository的DI:

在web项目的StartUp.cs的ConfigureServices里面为ClientRepository注册DI:

services.AddScoped<IClientRepository, ClientRepository>();

建立Controller

在controllers目录建立Angular/ClientController.cs:

namespace CoreApi.Web.Controllers.Angular
{
    [Route("api/[controller]")]
    public class ClientController : BaseController<ClientController>
    {
        private readonly IClientRepository _clientRepository;
        public ClientController(ICoreService<ClientController> coreService,
            IClientRepository clientRepository) : base(coreService)
        {
            _clientRepository = clientRepository;
        }

        [HttpGet]
        public async Task<IActionResult> GetAll()
        {
            var items = await _clientRepository.All.ToListAsync();
            var results = Mapper.Map<IEnumerable<ClientViewModel>>(items);
            return Ok(results);
        }

        [HttpGet]
        [Route("{id}", Name = "GetClient")]
        public async Task<IActionResult> Get(int id)
        {
            var item = await _clientRepository.GetSingleAsync(id);
            if (item == null)
            {
                return NotFound();
            }
            var result = Mapper.Map<ClientViewModel>(item);
            return Ok(result);
        }

        [HttpPost]
        public async Task<IActionResult> Post([FromBody] ClientCreationViewModel clientVm)
        {
            if (clientVm == null)
            {
                return BadRequest();
            }

            if (!ModelState.IsValid)
            {
                return BadRequest(ModelState);
            }

            var newItem = Mapper.Map<Client>(clientVm);
            newItem.SetCreation(UserName);
            _clientRepository.Add(newItem);
            if (!await UnitOfWork.SaveAsync())
            {
                return StatusCode(500, "保存客户时出错");
            }

            var vm = Mapper.Map<ClientViewModel>(newItem);

            return CreatedAtRoute("GetClient", new { id = vm.Id }, vm);
        }

        [HttpPut("{id}")]
        public async Task<IActionResult> Put(int id, [FromBody] ClientModificationViewModel clientVm)
        {
            if (clientVm == null)
            {
                return BadRequest();
            }

            if (!ModelState.IsValid)
            {
                return BadRequest(ModelState);
            }
            var dbItem = await _clientRepository.GetSingleAsync(id);
            if (dbItem == null)
            {
                return NotFound();
            }
            Mapper.Map(clientVm, dbItem);
            dbItem.SetModification(UserName);
            _clientRepository.Update(dbItem);
            if (!await UnitOfWork.SaveAsync())
            {
                return StatusCode(500, "保存客户时出错");
            }

            return NoContent();
        }

        [HttpPatch("{id}")]
        public async Task<IActionResult> Patch(int id, [FromBody] JsonPatchDocument<ClientModificationViewModel> patchDoc)
        {
            if (patchDoc == null)
            {
                return BadRequest();
            }
            var dbItem = await _clientRepository.GetSingleAsync(id);
            if (dbItem == null)
            {
                return NotFound();
            }
            var toPatchVm = Mapper.Map<ClientModificationViewModel>(dbItem);
            patchDoc.ApplyTo(toPatchVm, ModelState);

            TryValidateModel(toPatchVm);
            if (!ModelState.IsValid)
            {
                return BadRequest(ModelState);
            }

            Mapper.Map(toPatchVm, dbItem);

            if (!await UnitOfWork.SaveAsync())
            {
                return StatusCode(500, "更新的时候出错");
            }

            return NoContent();
        }

        [HttpDelete("{id}")]
        public async Task<IActionResult> Delete(int id)
        {
            var model = await _clientRepository.GetSingleAsync(id);
            if (model == null)
            {
                return NotFound();
            }
            _clientRepository.Delete(model);
            if (!await UnitOfWork.SaveAsync())
            {
                return StatusCode(500, "删除的时候出错");
            }
            return NoContent();
        }
    }
}

首先, Controller继承了ControllerBase这个类, ControllerBase是自己写的类, 里面可以放置一些公用的方法或属性, 目前里面的东西都没用:

namespace CoreApi.Web.Controllers.Bases
{
    public abstract class BaseController<T> : Controller
    {
        protected readonly IUnitOfWork UnitOfWork;
        protected readonly ILogger<T> Logger;
        protected readonly IFileProvider FileProvider;
        protected readonly ICoreService<T> CoreService;

        protected BaseController(ICoreService<T> coreService)
        {
            CoreService = coreService;
            UnitOfWork = coreService.UnitOfWork;
            Logger = coreService.Logger;
            FileProvider = coreService.FileProvider;
        }

        #region Current Information

        protected DateTime Now => DateTime.Now;
        protected string UserName => User.Identity.Name ?? "Anonymous";

        #endregion

    }
}

由于父类构造函数依赖的类太多了, 所以我建立了一个CoreService, 里面包含着这些依赖, 然后用一个变量就注入进去了, 这种写法不一定正确:

public interface ICoreService<out T> : IDisposable
    {
        IUnitOfWork UnitOfWork { get; }
        ILogger<T> Logger { get; }
        IFileProvider FileProvider { get; }
    }

Controller里面的方法应该都能看明白吧. 需要提一下的是UnitOfWork. 

Unit Of Work

我才用的是UnitOfWork和Repository模式, 多个Repository挂起的数据库操作, 可以使用一个UnitOfWork一次性提交.

由于DBContext已经实现了UnitOfWork模式, 所以可以直接在Controller里面使用DbContext, 但是我还是做了一个接口 IUnitOfWork:

namespace CoreApi.DataContext.Infrastructure
{
    public interface IUnitOfWork: IDisposable
    {
        int SaveChanges();
        int SaveChanges(bool acceptAllChangesOnSuccess);
        Task<int> SaveChangesAsync(bool acceptAllChangesOnSuccess, CancellationToken cancellationToken = default(CancellationToken));
        Task<int> SaveChangesAsync(CancellationToken cancellationToken = default(CancellationToken));

        bool Save();
        bool Save(bool acceptAllChangesOnSuccess);
        Task<bool> SaveAsync(bool acceptAllChangesOnSuccess, CancellationToken cancellationToken = default(CancellationToken));
        Task<bool> SaveAsync(CancellationToken cancellationToken = default(CancellationToken));
    }
}

里面前4个方法就是DbContext内置的方法, 后面4个方法可有可无, 就是上面4个方法的简单变形.

看一下CoreContext:

namespace CoreApi.DataContext.Core
{
    public class CoreContext : DbContext, IUnitOfWork
    {
        public CoreContext(DbContextOptions<CoreContext> options)
            : base(options)
        {
        }

        protected override void OnModelCreating(ModelBuilder modelBuilder)
        {
            base.OnModelCreating(modelBuilder);
            modelBuilder.HasDefaultSchema(AppSettings.DefaultSchema);

            modelBuilder.ApplyConfiguration(new UploadedFileConfiguration());
            modelBuilder.ApplyConfiguration(new ClientConfiguration());
        }

        public DbSet<UploadedFile> UploadedFiles { get; set; }
        public DbSet<Client> Clients { get; set; }

        public bool Save()
        {
            return SaveChanges() >= 0;
        }

        public bool Save(bool acceptAllChangesOnSuccess)
        {
            return SaveChanges(acceptAllChangesOnSuccess) >= 0;
        }

        public async Task<bool> SaveAsync(bool acceptAllChangesOnSuccess, CancellationToken cancellationToken = default(CancellationToken))
        {
            return await SaveChangesAsync(acceptAllChangesOnSuccess, cancellationToken) >= 0;
        }

        public async Task<bool> SaveAsync(CancellationToken cancellationToken = default(CancellationToken))
        {
            return await SaveChangesAsync(cancellationToken) >= 0;
        }
    }
}

差不多了, 开始

迁移数据库

在Package Manager Console分别执行 Add-Migration XXX和 Update-database命令.

注意这个时候 解决方案的启动项目必须是Web项目, 如果设置了多个启动项目, 迁移命令会不太好用.

然后运行一下: 选择CoreApi.Web而不是IISExpress, 这样的话端口应该是 http://localhost:5001/api/values

到Swagger里简单测试下

然后进入swagger简单测试一下ClientController: http://localhost:5001/swagger/

先添加数据 POST:

先点击右侧, 然后会把数据的json模板复制到左边的框里, 然后修改值, 然后点击try It out, 结果如下:

然后两个Get, Delete, Put您都应该会测试.

这里试一下 Patch:

再查询一下, 应该没有什么问题.

先写到这, 明天就能差不多写完了吧.