1. 仓储（Repository）
   仓储模式封装对数据源的访问逻辑，包括CRUD操作。以下是一个简单的仓储接口和实现示例：

public interface IRepository where T : class
{
Task<IEnumerable> GetAllAsync();
Task GetByIdAsync(int id);
Task AddAsync(T entity);
Task UpdateAsync(T entity);
Task DeleteAsync(int id);
}

public class Repository : IRepository where T : class
{
private readonly DbContext _context;
private readonly DbSet _dbSet;

public Repository(DbContext context)
{
    _context = context;
    _dbSet = context.Set<T>();
}

public async Task<IEnumerable<T>> GetAllAsync() => await _dbSet.ToListAsync();

public async Task<T> GetByIdAsync(int id) => await _dbSet.FindAsync(id);

public async Task AddAsync(T entity) => await _dbSet.AddAsync(entity);

public async Task UpdateAsync(T entity) => _dbSet.Update(entity);

public async Task DeleteAsync(int id)
{
    var entity = await GetByIdAsync(id);
    if (entity != null)
    {
        _dbSet.Remove(entity);
    }
}

}
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2. 工作单元（Unit of Work）
工作单元职责是协调多个仓储之间的操作，并统一提交事务。以下是一个工作单元的接口和实现示例：

public interface IUnitOfWork : IDisposable
{
IRepository Repository() where TEntity : class;
Task SaveChangesAsync();
}

public class UnitOfWork : IUnitOfWork
{
private readonly DbContext _context;

public UnitOfWork(DbContext context)
{
    _context = context;
}

public IRepository<TEntity> Repository<TEntity>() where TEntity : class
{
    return new Repository<TEntity>(_context);
}

public async Task<int> SaveChangesAsync() => await _context.SaveChangesAsync();

public void Dispose()
{
    _context.Dispose();
}

}
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3. 服务层（Service Layer）
服务层处理业务逻辑，并调用仓储和工作单元。以下是服务层的示例：

public interface IMyService
{
Task<IEnumerable> GetAllEntitiesAsync();
Task GetEntityByIdAsync(int id);
Task AddEntityAsync(MyEntity entity);
Task UpdateEntityAsync(MyEntity entity);
Task DeleteEntityAsync(int id);
}

public class MyService : IMyService
{
private readonly IUnitOfWork _unitOfWork;

public MyService(IUnitOfWork unitOfWork)
{
    _unitOfWork = unitOfWork;
}

public async Task<IEnumerable<MyEntity>> GetAllEntitiesAsync()
{
    return await _unitOfWork.Repository<MyEntity>().GetAllAsync();
}

public async Task<MyEntity> GetEntityByIdAsync(int id)
{
    return await _unitOfWork.Repository<MyEntity>().GetByIdAsync(id);
}

public async Task AddEntityAsync(MyEntity entity)
{
    await _unitOfWork.Repository<MyEntity>().AddAsync(entity);
    await _unitOfWork.SaveChangesAsync();
}

public async Task UpdateEntityAsync(MyEntity entity)
{
    await _unitOfWork.Repository<MyEntity>().UpdateAsync(entity);
    await _unitOfWork.SaveChangesAsync();
}

public async Task DeleteEntityAsync(int id)
{
    await _unitOfWork.Repository<MyEntity>().DeleteAsync(id);
    await _unitOfWork.SaveChangesAsync();
}

}
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4. 控制器（Controller）
控制器接收用户请求并调用服务层。以下是控制器的示例：

[ApiController]
[Route("[controller]")]
public class MyEntityController : ControllerBase
{
private readonly IMyService _myService;

public MyEntityController(IMyService myService)
{
    _myService = myService;
}

[HttpGet]
public async Task<IActionResult> GetAll()
{
    var entities = await _myService.GetAllEntitiesAsync();
    return Ok(entities);
}

[HttpGet("{id}")]
public async Task<IActionResult> Get(int id)
{
    var entity = await _myService.GetEntityByIdAsync(id);
    if (entity == null) return NotFound();
    return Ok(entity);
}

[HttpPost]
public async Task<IActionResult> Post([FromBody] MyEntity entity)
{
    await _myService.AddEntityAsync(entity);
    return CreatedAtAction(nameof(Get), new { id = entity.Id }, entity);
}

[HttpPut("{id}")]
public async Task<IActionResult> Put(int id, [FromBody] MyEntity entity)
{
    if (id != entity.Id) return BadRequest();
    await _myService.UpdateEntityAsync(entity);
    return NoContent();
}

[HttpDelete("{id}")]
public async Task<IActionResult> Delete(int id)
{
    await _myService.DeleteEntityAsync(id);
    return NoContent();
}

}
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总结
通过结合使用仓储、工作单元、服务层和控制器，可以构建一个高内聚、低耦合的分层架构。这种设计有助于增强代码的可读性、可维护性和可扩展性。在实际开发中，可以根据团队和项目的需求进行适当的调整和优化。