ASP.NET Core Clean Architecture

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项目地址

• 教程作者：ASP.NET Core Clean Architecture 2022-12

• 教程地址：

https://www.bilibili.com/video/BV1YZ421M7UA?spm_id_from=333.788.player.switch&vd_source=d14620e2c9f01dee5d2a104075027ad1&p=16

• 代码仓库地址：

• 所用到的框架和插件：

一、项目主体

• 整个项目4层结构

• Application层
  

1. CQRS

1.1 Repository数据库接口

• Application层的Contracts里的Persistence，存放数据库的接口
  
• IAsyncRepository:基类主要功能，规定 增删改查/单一查询/分页

namespace GloboTicket.TicketManagement.Application.Contracts.Persistence
{public interface IAsyncRepository<T> where T : class{Task<T?> GetByIdAsync(Guid id);Task<IReadOnlyList<T>> ListAllAsync();Task<T> AddAsync(T entity);Task UpdateAsync(T entity);Task DeleteAsync(T entity);Task<IReadOnlyList<T>> GetPagedReponseAsync(int page, int size);}
}

• ICategoryRepository.cs：添加自己独特的GetCategoriesWithEvents 方法

namespace GloboTicket.TicketManagement.Application.Contracts.Persistence
{public interface ICategoryRepository : IAsyncRepository<Category>{Task<List<Category>> GetCategoriesWithEvents(bool includePassedEvents);}
}

• IEventRepository.cs：添加Event自己的方法

namespace GloboTicket.TicketManagement.Application.Contracts.Persistence
{public interface IEventRepository : IAsyncRepository<Event>{Task<bool> IsEventNameAndDateUnique(string name, DateTime eventDate);}
}

• IOrderRepository.cs: 没有自己的方法，直接继承使用

namespace GloboTicket.TicketManagement.Application.Contracts.Persistence
{public interface IOrderRepository: IAsyncRepository<Order>{}
}

1.2 GetEventDetail 完整的Query流程

• 项目层级
  

• EventDetailVm.cs :用于返回给接口的数据

• CategoryDto.cs：表示在GetEventDetail里需要用到的Dto
  
• GetEventDetailQuery.cs ：传入ID的值，以及返回EventDetailVm

• GetEventDetailQueryHandler.cs ：返回查询

• 返回API的结构类似于

{"eventId": "123e4567-e89b-12d3-a456-426614174000","name": "Rock Concert","price": 100,"artist": "The Rock Band","date": "2023-12-25T20:00:00","description": "An amazing rock concert to end the year!","imageUrl": "https://example.com/images/rock-concert.jpg","categoryId": "456e7890-f12g-34h5-i678-901234567890","category": {"id": "456e7890-f12g-34h5-i678-901234567890","name": "Music"}
}

1.3 创建CreateEventCommand并使用validation

1. 设置验证类 CreateEventCommandValidator.cs

using FluentValidation;
using GloboTicket.TicketManagement.Application.Contracts.Persistence;
using System;
using System.Threading;
using System.Threading.Tasks;namespace GloboTicket.TicketManagement.Application.Features.Events.Commands.CreateEvent
{public class CreateEventCommandValidator : AbstractValidator<CreateEventCommand>{private readonly IEventRepository _eventRepository;public CreateEventCommandValidator(IEventRepository eventRepository){_eventRepository = eventRepository;RuleFor(p => p.Name).NotEmpty().WithMessage("{PropertyName} is required.").NotNull().MaximumLength(50).WithMessage("{PropertyName} must not exceed 50 characters.");RuleFor(p => p.Date).NotEmpty().WithMessage("{PropertyName} is required.").NotNull().GreaterThan(DateTime.Now);RuleFor(e => e).MustAsync(EventNameAndDateUnique).WithMessage("An event with the same name and date already exists.");RuleFor(p => p.Price).NotEmpty().WithMessage("{PropertyName} is required.").GreaterThan(0);}private async Task<bool> EventNameAndDateUnique(CreateEventCommand e, CancellationToken token){return !(await _eventRepository.IsEventNameAndDateUnique(e.Name, e.Date));}}
}

2. Command类：CreateEventCommand.cs

using MediatR;namespace GloboTicket.TicketManagement.Application.Features.Events.Commands.CreateEvent
{public class CreateEventCommand: IRequest<Guid>{public string Name { get; set; } = string.Empty;public int Price { get; set; }public string? Artist { get; set; }public DateTime Date { get; set; }public string? Description { get; set; }public string? ImageUrl { get; set; }public Guid CategoryId { get; set; }public override string ToString(){return $"Event name: {Name}; Price: {Price}; By: {Artist}; On: {Date.ToShortDateString()}; Description: {Description}";}}
}

3. CreateEventCommandHandler.cs：处理Command，并且使用validator

4. 自定义验证逻辑：查询在IEventRepository接口里
   

2. EFcore层

• 数据库接口层：Core层的Contracts里的Persistence
  

• 实现层：Infrastructure层的Persistence
  

2.1 BaseRepository

• BaseRepository.cs：定义
  

2.2 CategoryRepository

• CategoryRepository.cs：继承BaseRepository，以及实现接口
  

2.3 OrderRepository

• OrderRepository.cs 使用分页
  

3. Email/Excel导出

3.1 Email

1. Email接口层

• 接口

namespace GloboTicket.TicketManagement.Application.Contracts.Infrastructure
{public interface IEmailService{Task<bool> SendEmail(Email email);}
}

2. Email的Model层

• Model实体：定义Email发送的内容和设置
  

3. 具体Email的实现层

• 在Infrastructure层里的infrastructure里实现
  

4. 配置settings

appsettings.json

3.2 Excel导出

1. 导出excel接口层

• Core文件夹/Application类库/Contracts文件夹/infrastructure文件夹/IEmailService.cs

namespace GloboTicket.TicketManagement.Application.Contracts.Infrastructure
{public interface ICsvExporter{byte[] ExportEventsToCsv(List<EventExportDto> eventExportDtos);}
}

2. Controller层

• API文件夹/GloboTicket.TicketManagement.Api类库/Controllers文件夹/ EventsController.cs
  

3. Query层

• GetEventsExportQuery.cs：返回值EventExportFileVm类，无参数

using MediatR;namespace GloboTicket.TicketManagement.Application.Features.Events.Queries.GetEventsExport
{public class GetEventsExportQuery: IRequest<EventExportFileVm>{}
}

• EventExportFileVm.cs：定义返回的文件类

public class EventExportFileVm
{public string EventExportFileName { get; set; } = string.Empty;public string ContentType { get; set; } = string.Empty;public byte[]? Data { get; set; }
}

• EventExportDto.cs:

namespace GloboTicket.TicketManagement.Application.Features.Events.Queries.GetEventsExport
{public class EventExportDto{public Guid EventId { get; set; }public string Name { get; set; } = string.Empty;public DateTime Date { get; set; }}
}

• handler
  

4. 实现IExcelService

• Infrastructure文件夹/Infrastructure类库/FileExport文件夹/CsvExporter.cs

using CsvHelper;
using GloboTicket.TicketManagement.Application.Contracts.Infrastructure;
using GloboTicket.TicketManagement.Application.Features.Events.Queries.GetEventsExport;namespace GloboTicket.TicketManagement.Infrastructure.FileExport
{public class CsvExporter : ICsvExporter{public byte[] ExportEventsToCsv(List<EventExportDto> eventExportDtos){using var memoryStream = new MemoryStream();using (var streamWriter = new StreamWriter(memoryStream)){using var csvWriter = new CsvWriter(streamWriter);csvWriter.WriteRecords(eventExportDtos);}return memoryStream.ToArray();}}
}

4. 定义response/全局错误处理中间件

4.1 统一response

• 除了使用.net直接返回状态码之外，还可以统一响应的格式

{"success": true,  //是否成功"message": "操作成功", //操作结果"data": {},  //返回数据内容"errorCode": null //错误类型或错误码
}

1. 定义统一的返回类

• ApiResponse.cs类：处理所有返回的格式

public class ApiResponse<T>
{public bool Success { get; set; }public string Message { get; set; }public T? Data { get; set; }public string? ErrorCode { get; set; }public List<string>? ValidationErrors { get; set; }public ApiResponse(bool success, string message, T? data = default, string? errorCode = null){Success = success;Message = message;Data = data;ErrorCode = errorCode;}public static ApiResponse<T> SuccessResponse(T data, string message = "操作成功"){return new ApiResponse<T>(true, message, data);}public static ApiResponse<T> ErrorResponse(string message, string errorCode, List<string>? validationErrors = null){return new ApiResponse<T>(false, message, default, errorCode) { ValidationErrors = validationErrors };}
}

2. 使用

• 在Handler里使用

public async Task<ApiResponse<CreateCategoryDto>> Handle(CreateCategoryCommand request, CancellationToken cancellationToken)
{// 1. 初始化响应var validator = new CreateCategoryCommandValidator();var validationResult = await validator.ValidateAsync(request);// 2. 验证失败，返回错误响应if (validationResult.Errors.Count > 0){var validationErrors = validationResult.Errors.Select(e => e.ErrorMessage).ToList();return ApiResponse<CreateCategoryDto>.ErrorResponse("请求验证失败", "VALIDATION_ERROR", validationErrors);}// 3. 验证成功，继续处理业务逻辑var category = new Category() { Name = request.Name };category = await _categoryRepository.AddAsync(category);var categoryDto = _mapper.Map<CreateCategoryDto>(category);// 4. 返回成功响应return ApiResponse<CreateCategoryDto>.SuccessResponse(categoryDto, "分类创建成功");
}

• 成功返回：

{"success": true,"message": "分类创建成功","data": {"id": 1,"name": "Sport"}
}

• 验证失败

{"success": false,"message": "请求验证失败","errorCode": "VALIDATION_ERROR","validationErrors": ["分类名称不能为空","分类名称长度不能超过50个字符"]
}

4.2 全局错误处理中间件

5. JWT token

6. 添加日志

7. 版本控制

8. 分页

9. 配置中间件和服务注册

• 模仿.ne5，将Program.cs里注册分离

1. 创建StartupExtensions.cs用来将program.cs里的代码分离
   
2. 在program.cs里配置

二、测试

• 使用框架

Moq用来模拟数据
Shouldly 用来断言
xunit 测试框架

1. Unitest

• Automatically 代码片段测试，快速
• 测试的是Public API
• 独立运行 run in isolation
• 结果断言

2. Integration Tests

• end to end test between different layers
• more work to set up
• often linked with database