aspnet

name	aspnet
description	ASP.NET Core backend development standards. Use this skill when developing ASP.NET Core projects, implementing REST APIs, using Entity Framework Core, or JWT authentication.

ASP.NET Core 后端开发规范

触发条件

• Develop ASP.NET Core projects
• Implement REST APIs
• Use Entity Framework Core for data access
• Implement JWT authentication
• Implement permission control

---

Part 1: 技术栈

层	选型	说明
运行环境	.NET 8+	跨平台运行时
Web 框架	ASP.NET Core	内置依赖注入、中间件管道
ORM	Entity Framework Core	LINQ 查询、Code First、迁移
数据库	MySQL 8.x	InnoDB 引擎
缓存	Redis 7.x	分布式缓存
认证	JWT (Microsoft.AspNetCore.Authentication.JwtBearer)	Token 认证
API 文档	Swashbuckle	OpenAPI 生成

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Part 2: 目录结构

src/
├── Youlai.Api/                     # API 层（Controller + 中间件）
│   ├── Program.cs                  # 启动配置
│   ├── Controllers/                # 按模块分目录，复数命名
│   │   ├── Auth/{AuthController, WxMaAuthController}
│   │   ├── System/{UsersController, RolesController, MenusController, ...}
│   │   ├── Codegen/{CodegenController}
│   │   ├── File/{FilesController}
│   │   └── Message/{SseController}
│   ├── Filters/                    # LogActionFilter
│   ├── Middlewares/                # ExceptionHandlingMiddleware, RateLimitMiddleware
│   ├── Security/                   # CurrentUser, HasPermAttribute, JwtExtensions, PermissionAuthorizationHandler
│   └── Swagger/                    # FileUploadOperationFilter
│
├── Youlai.Application/            # 应用层（Service + DTO）
│   ├── DependencyInjection.cs
│   ├── Auth/                       # IAuthService, AuthService, WxMaAuthService + Models/
│   ├── Common/                     # ILoggingService, SseService
│   ├── Constants/                  # RedisKeyConstants
│   ├── Exceptions/                 # BusinessException
│   ├── Options/                    # SecurityOptions, RedisOptions, WxMaOptions
│   ├── Results/                    # Result, PageResult, ResultCode
│   ├── Security/                   # ICurrentUser, JwtTokenManager, DataPermissionService + Models/
│   └── System/                     # IUserService, UserService 等 + Models/{User,Role,Menu,Dept,...}/
│
├── Youlai.Domain/                  # 领域层（最薄，无依赖）
│   ├── Entities/                   # SysUser, SysRole, SysMenu 等
│   └── Enums/                      # ActionType, LogModule, MenuType
│
├── Youlai.Infrastructure/          # 基础设施层
│   ├── DependencyInjection.cs
│   ├── Persistence/AppDbContext.cs
│   ├── FileStorage/                # LocalFileStorage, MinioFileStorage
│   └── CodegenTemplates/           # Scriban 模板
│
└── tests/Youlai.Api.Tests/         # 集成测试

设计原则：

• Youlai.Domain 是最薄层，不依赖任何层
• Youlai.Application 依赖 Domain，不依赖 Api 和 Infrastructure
• Youlai.Infrastructure 实现接口，依赖 Application
• Youlai.Api 作为入口，组合所有层

---

Part 3: 命名规范

3.1 文件命名

类型	规范	示例
Controller	{Entity}Controller.cs	UserController.cs
Service 接口	I{Entity}Service.cs	IUserService.cs
Service 实现	{Entity}Service.cs	UserService.cs
Entity	PascalCase	SysUser.cs
DTO	功能 + 类型后缀	UserForm.cs, UserVO.cs
Enums	PascalCase + 无后缀	ActionType.cs

3.2 类命名

类型	规范	示例
Controller	{Entity}Controller	UserController
Service 接口	I{Entity}Service	IUserService
Service 实现	{Entity}Service	UserService
Entity	PascalCase	SysUser
DTO	功能 + 类型	UserVO, UserForm, UserPageQuery

DTO 后缀规范：

后缀	用途	示例
VO	视图对象（返回前端）	UserVO, RolePageVO
Form / RequestDto	表单/请求对象	UserForm, LoginRequestDto
Query	查询参数	UserQuery, RolePageQuery
Dto	传输对象	CurrentUserDto, ExcelResultDto

3.3 方法命名

动作	前缀	示例
查询单个	Get	GetByIdAsync()
查询列表	List	ListUsersAsync()
分页查询	Page	PageUsersAsync()
新增	Create	CreateUserAsync()
更新	Update	UpdateUserAsync()
删除	Delete	DeleteUserAsync()
下拉选项	GetXxxOptions	GetUserOptionsAsync()

3.4 变量命名

类型	规范	示例
局部变量	camelCase	userList
常量	PascalCase	MaxSize
私有字段	_ 前缀 camelCase	_userService
布尔值	Is/Has/Can 前缀	IsDeleted, HasPermission

⚠️ ASP.NET Core 约定私有字段用 _ 前缀（与 Spring Boot 不同），与官方文档和 EF Core 一致。

---

Part 4: RESTful API 规范

4.1 标准 CRUD 路径

操作	方法	路径	说明
分页列表	GET	/api/v1/users/page	Query 参数
详情	GET	/api/v1/users/{id}	路径参数
表单数据	GET	/api/v1/users/{id}/form	编辑回显
新增	POST	/api/v1/users	Body: UserForm
更新	PUT	/api/v1/users	Body: UserForm
删除	DELETE	/api/v1/users/{id}	路径参数
批量删除	DELETE	/api/v1/users/batch	Body: List<long>
下拉选项	GET	/api/v1/users/options	返回 List<OptionType>

4.2 Controller 模板

[ApiController]
[Route("api/v1/users")]
[ApiExplorerSettings(GroupName = "用户管理")]
public class UserController : ControllerBase
{
    private readonly IUserService _userService;

    public UserController(IUserService userService) =>
        _userService = userService;

    [HttpGet("page")]
    [SwaggerOperation(Summary = "用户分页列表")]
    public async Task<Result<PageResult<UserVO>>> Page([FromQuery] UserPageQuery query) =>
        Result.Success(await _userService.PageUsersAsync(query));

    [HttpPost]
    [SwaggerOperation(Summary = "新增用户")]
    [Authorize(Policy = "sys:user:add")]
    public async Task<Result<long>> Create([FromBody] UserForm form) =>
        Result.Success(await _userService.CreateUserAsync(form));

    [HttpPut]
    [SwaggerOperation(Summary = "更新用户")]
    [Authorize(Policy = "sys:user:edit")]
    public async Task<Result> Update([FromBody] UserForm form)
    {
        await _userService.UpdateUserAsync(form);
        return Result.Success();
    }

    [HttpDelete("{id}")]
    [SwaggerOperation(Summary = "删除用户")]
    [Authorize(Policy = "sys:user:delete")]
    public async Task<Result> Delete(long id)
    {
        await _userService.DeleteUserAsync(id);
        return Result.Success();
    }

    [HttpGet("options")]
    [SwaggerOperation(Summary = "用户选项列表")]
    public async Task<Result<List<OptionType>>> Options() =>
        Result.Success(await _userService.GetUserOptionsAsync());
}

---

Part 5: 响应格式与异常处理

5.1 统一响应

public class Result<T>
{
    public int Code { get; set; }
    public string Msg { get; set; } = string.Empty;
    public T? Data { get; set; }

    public static Result<T> Success(T? data = default) => new() { Code = 200, Msg = "操作成功", Data = data };
    public static Result<T> Failed(int code, string msg) => new() { Code = code, Msg = msg };
}

public class PageResult<T>
{
    public List<T> List { get; set; } = [];
    public long Total { get; set; }

    public static PageResult<T> Of(List<T> list, long total) => new() { List = list, Total = total };
}

5.2 业务异常

public class BusinessException : Exception
{
    public BusinessException(string message) : base(message) { }
}

5.3 全局异常处理

public class ExceptionMiddleware
{
    private readonly RequestDelegate _next;

    public ExceptionMiddleware(RequestDelegate next) => _next = next;

    public async Task InvokeAsync(HttpContext context)
    {
        try { await _next(context); }
        catch (BusinessException ex) { await WriteResult(context, 200, ex.Message); }
        catch (Exception ex) { await WriteResult(context, 500, "系统异常"); }
    }

    private static async Task WriteResult(HttpContext context, int code, string msg)
    {
        context.Response.StatusCode = 200;
        context.Response.ContentType = "application/json";
        await context.Response.WriteAsync(JsonSerializer.Serialize(new { Code = code, Msg = msg, Data = (object?)null }));
    }
}

---

Part 6: 实体规范

public abstract class BaseEntity
{
    [Key][Column("id")] public long Id { get; set; }
    [Column("create_time")] public DateTime CreateTime { get; set; } = DateTime.Now;
    [Column("update_time")] public DateTime UpdateTime { get; set; } = DateTime.Now;
    [Column("deleted")] public bool Deleted { get; set; } = false;
}

[Table("sys_user")]
public class SysUser : BaseEntity
{
    [Required][MaxLength(50)][Column("username")] public string Username { get; set; } = "";
    [Required][MaxLength(100)][Column("password")] public string Password { get; set; } = "";
    [Required][MaxLength(50)][Column("nickname")] public string Nickname { get; set; } = "";
    [MaxLength(20)][Column("mobile")] public string? Mobile { get; set; }
    [Column("status")] public int Status { get; set; } = 1;
    [Column("dept_id")] public long? DeptId { get; set; }
}

---

Part 7: Service 规范

public interface IUserService
{
    Task<PageResult<UserVO>> PageUsersAsync(UserPageQuery query);
    Task<UserVO> GetUserByIdAsync(long id);
    Task<UserForm> GetUserFormDataAsync(long id);
    Task<long> CreateUserAsync(UserForm form);
    Task UpdateUserAsync(UserForm form);
    Task DeleteUserAsync(long id);
}

public class UserService : IUserService
{
    private readonly AppDbContext _context;

    public UserService(AppDbContext context) => _context = context;

    public async Task<PageResult<UserVO>> PageUsersAsync(UserPageQuery query)
    {
        var q = _context.Users.Where(u => !u.Deleted);
        if (!string.IsNullOrEmpty(query.Keywords))
            q = q.Where(u => u.Username.Contains(query.Keywords));
        if (query.Status.HasValue)
            q = q.Where(u => u.Status == query.Status.Value);

        var total = await q.CountAsync();
        var list = await q.OrderByDescending(u => u.CreateTime)
            .Skip((query.PageNum - 1) * query.PageSize).Take(query.PageSize)
            .Select(u => new UserVO { Id = u.Id, Username = u.Username, Status = u.Status, CreateTime = u.CreateTime })
            .ToListAsync();
        return PageResult<UserVO>.Of(list, total);
    }

    public async Task<long> CreateUserAsync(UserForm form)
    {
        if (await _context.Users.AnyAsync(u => u.Username == form.Username && !u.Deleted))
            throw new BusinessException("用户名已存在");
        var user = new SysUser { Username = form.Username, Password = BCrypt.HashPassword(form.Password), Status = form.Status };
        _context.Users.Add(user);
        await _context.SaveChangesAsync();
        return user.Id;
    }
}

---

Part 8: 认证规范

8.1 JWT 配置

builder.Services.AddAuthentication(JwtBearerDefaults.AuthenticationScheme)
    .AddJwtBearer(options => {
        options.TokenValidationParameters = new TokenValidationParameters {
            ValidateIssuer = true,
            ValidIssuer = builder.Configuration["Jwt:Issuer"],
            IssuerSigningKey = new SymmetricSecurityKey(
                Encoding.UTF8.GetBytes(builder.Configuration["Jwt:Secret"]!))
        };
    });

builder.Services.AddAuthorization(options => {
    options.AddPolicy("sys:user:add", p => p.RequireClaim("permission", "sys:user:add"));
    options.AddPolicy("sys:user:edit", p => p.RequireClaim("permission", "sys:user:edit"));
});

8.2 权限校验

// Controller 中使用 Policy 进行权限校验
[Authorize(Policy = "sys:user:add")]

// 权限标识命名：模块:实体:操作
// sys:user:create / sys:user:edit / sys:user:delete / sys:role:list / sys:menu:assign

8.3 当前用户

public interface ICurrentUser
{
    long UserId { get; }
    string Username { get; }
    List<string> Permissions { get; }
}

public class CurrentUser : ICurrentUser
{
    public long UserId => long.Parse(HttpContext.User.FindFirst(JwtRegisteredClaimNames.Sub)?.Value ?? "0");
    public string Username => HttpContext.User.FindFirst(JwtRegisteredClaimNames.UniqueName)?.Value ?? "";
    public List<string> Permissions => HttpContext.User.FindFirst("permission")?.Value?.Split(',').ToList() ?? [];
}

---

Part 9: 注释规范

• 公共方法用 /// <summary> XML 注释（IDE 智能提示可识别）
• Swagger 使用 [SwaggerOperation(Summary = "...")]
• 代码修改时注释必须同步更新

/// <summary>
/// 用户管理控制器。
/// </summary>
[ApiExplorerSettings(GroupName = "用户管理")]
public class UserController : ControllerBase
{
    /// <summary>
    /// 创建新用户。
    /// </summary>
    /// <param name="form">用户表单（username 必填且唯一）</param>
    /// <returns>新用户 ID</returns>
    /// <exception cref="BusinessException">用户名已存在</exception>
    [HttpPost]
    [SwaggerOperation(Summary = "新增用户")]
    public async Task<Result<long>> Create([FromBody] UserForm form) { ... }
}

---

Part 10: 代码质量检查清单

• 遵循 RESTful API 路径规范
• 使用统一响应格式
• 实现全局异常处理中间件
• 权限校验使用 Authorize(Policy = "...")
• 分页接口使用 PageResult
• 实体继承 BaseEntity
• 使用 EF Core 逻辑删除
• API 添加 [SwaggerOperation] 注解
• 分层：Controller → Service → Repository
• 异步方法以 Async 结尾
• 公共方法有 /// <summary> XML 注释

常见反模式

反模式	正确做法
throw new Exception("用户不存在")	throw new BusinessException("用户不存在")
catch { } 空捕获	捕获并记录日志或抛出业务异常
public async Task<T> Xxx() 无 Async 后缀	加 Async 后缀：XxxAsync()
Controller 中写业务逻辑	委托 Service 层处理
同步方法调 SaveChangesAsync().Result	使用 await SaveChangesAsync()