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使用Cursor进行C#编程的详细步骤

作者:老胖闲聊

Cursor 是一款功能强大的代码编辑器,它凭借其人工智能辅助功能,为开发者带来了诸多便利,本文将给大家介绍了用Cursor 进行C#编程的超详细指南,需要的朋友可以参考下

一、环境配置深度说明

1. .NET SDK版本管理

# 查看已安装版本
dotnet --list-sdks

# 全局设置默认版本
dotnet new globaljson --sdk-version 8.0.301

2. C#扩展配置

{
  "configurations": [
    {
      "name": ".NET Core Launch (web)",
      "type": "coreclr",
      "request": "launch",
      "preLaunchTask": "build",
      "program": "${workspaceFolder}/bin/Debug/net8.0/YourProject.dll",
      "args": [],
      "cwd": "${workspaceFolder}",
      "stopAtEntry": false,
      "serverReadyAction": {
        "action": "openExternally",
        "pattern": "\\bNow listening on:\\s+(https?://\\S+)"
      }
    }
  ]
}

二、进阶案例:构建完整CRUD应用

案例目标:开发一个图书管理API,包含JWT认证和Swagger文档

步骤1:生成基础架构

创建一个ASP.NET Core Web API项目,包含以下功能:
- 使用Entity Framework Core + SQLite
- 包含Book模型(Id:int, Title:string, Author:string, ISBN:string)
- 包含BooksController的CRUD端点
- 启用Swagger
builder.Services.AddDbContext<AppDbContext>(options => 
    options.UseSqlite(builder.Configuration.GetConnectionString("Default")));

builder.Services.AddEndpointsApiExplorer();
builder.Services.AddSwaggerGen();

步骤2:添加JWT认证

为当前项目添加JWT Bearer认证,要求:
- 生成User模型(Username, PasswordHash)
- 添加AuthController的/login端点
- 在Swagger中显示认证按钮
public class JwtService
{
    private readonly IConfiguration _config;
    
    public JwtService(IConfiguration config) => _config = config;

    public string GenerateToken(User user)
    {
        var key = new SymmetricSecurityKey(
            Encoding.UTF8.GetBytes(_config["Jwt:Key"]!));
        
        var creds = new SigningCredentials(key, SecurityAlgorithms.HmacSha256);
        
        var token = new JwtSecurityToken(
            issuer: _config["Jwt:Issuer"],
            audience: _config["Jwt:Audience"],
            claims: new[] { new Claim(ClaimTypes.Name, user.Username) },
            expires: DateTime.Now.AddHours(1),
            signingCredentials: creds);
        
        return new JwtSecurityTokenHandler().WriteToken(token);
    }
}

步骤3:数据验证增强

为Book模型添加数据注解验证:
- Title长度1-100字符
- ISBN必须符合正则表达式^\d{3}-\d{10}$
- Author不能为空
public class Book
{
    public int Id { get; set; }
    
    [Required]
    [StringLength(100, MinimumLength = 1)]
    public string Title { get; set; }
    
    [Required]
    [RegularExpression(@"^\d{3}-\d{10}$", 
        ErrorMessage = "ISBN格式应为XXX-XXXXXXXXXX")]
    public string ISBN { get; set; }
    
    [Required]
    public string Author { get; set; }
}

三、调试与测试深度集成

1. AI辅助调试

CS1061: 'AppDbContext' does not contain a definition for 'Books'...
该错误表明DbContext缺少DbSet<Book>属性。解决方案:
1. 在AppDbContext中添加:
   public DbSet<Book> Books { get; set; }
2. 执行迁移命令:
   dotnet ef migrations add AddBooksTable
   dotnet ef database update

2. 单元测试生成

使用xUnit为BookService编写测试:
- 测试GetAllBooks返回空列表当数据库为空
- 测试CreateBook返回正确ISBN
public class BookServiceTests : IDisposable
{
    private readonly AppDbContext _context;

    public BookServiceTests()
    {
        var options = new DbContextOptionsBuilder<AppDbContext>()
            .UseSqlite("DataSource=:memory:")
            .Options;
        
        _context = new AppDbContext(options);
        _context.Database.OpenConnection();
        _context.Database.EnsureCreated();
    }

    [Fact]
    public async Task GetAllBooks_ReturnsEmptyList_WhenNoBooks()
    {
        var service = new BookService(_context);
        var result = await service.GetAllBooks();
        Assert.Empty(result);
    }
}

四、企业级开发规范

1. 架构模式引导

输入指令示例:

使用Clean Architecture重构当前项目,包含:
- Application层(MediatR + AutoMapper)
- Infrastructure层(EF Core实现)
- API层(Minimal API端点)

AI将生成:

// Application/Books/Queries/GetAllBooks.cs
public record GetAllBooksQuery : IRequest<List<BookDto>>;

public class GetAllBooksHandler : IRequestHandler<GetAllBooksQuery, List<BookDto>>
{
    private readonly IApplicationDbContext _context;
    private readonly IMapper _mapper;

    public GetAllBooksHandler(IApplicationDbContext context, IMapper mapper)
    {
        _context = context;
        _mapper = mapper;
    }

    public async Task<List<BookDto>> Handle(GetAllBooksQuery request, CancellationToken ct)
    {
        return _mapper.Map<List<BookDto>>(
            await _context.Books.ToListAsync(ct));
    }
}

2. 性能优化指导

输入:

优化数据访问层:
- 为GetBookById添加AsNoTracking
- 在查询中使用ProjectTo自动映射DTO
- 添加内存缓存策略

AI生成:

public async Task<BookDto> GetBookById(int id)
{
    return await _memoryCache.GetOrCreateAsync($"book_{id}", async entry =>
    {
        entry.AbsoluteExpirationRelativeToNow = TimeSpan.FromMinutes(5);
        return await _context.Books
            .AsNoTracking()
            .Where(b => b.Id == id)
            .ProjectTo<BookDto>(_mapper.ConfigurationProvider)
            .FirstOrDefaultAsync();
    });
}

五、企业级项目注意事项(补充)

dotnet user-secrets init
dotnet user-secrets set "Jwt:Key" "YourSecureKeyHere"
name: .NET Core CI

on: [push]

jobs:
  build:
    runs-on: ubuntu-latest
    steps:
    - uses: actions/checkout@v4
    - name: Setup .NET
      uses: actions/setup-dotnet@v3
      with:
        dotnet-version: 8.0.x
    - name: Restore dependencies
      run: dotnet restore
    - name: Build
      run: dotnet build --configuration Release --no-restore
<PropertyGroup>
  <SonarQubeExclude>**/Migrations/**</SonarQubeExclude>
  <SonarQubeTestProject>false</SonarQubeTestProject>
</PropertyGroup>

六、Cursor高级功能挖掘

@startuml
class Book {
  +int Id
  +string Title
  +string Author
  +string ISBN
}
@enduml
context.Books.Where(b => b.Author == "J.R.R. Tolkien").OrderBy(b => b.Title)
SELECT * FROM Books 
WHERE Author = 'J.R.R. Tolkien' 
ORDER BY Title ASC
<Window>
  <Grid>
    <DataGrid ItemsSource="{Binding Books}">
      <DataGrid.Columns>
        <DataGridTextColumn Header="Title" Binding="{Binding Title}"/>
      </DataGrid.Columns>
    </DataGrid>
  </Grid>
</Window>

以上补充内容覆盖了企业级开发的完整生命周期。实际使用时建议:

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