asp.net core6实现增删改查功能

ASP.NET Core 6 提供了许多方式来实现增删改查功能，其中最常见的方式是使用控制器（Controller）和数据访问对象（Data Access Object，DAO）。

下面是一个简单的示例，演示如何使用 ASP.NET Core 6 实现增删改查功能：

1. 创建一个 ASP.NET Core 6 Web 应用程序。

2. 在项目中添加一个控制器（Controller），例如，命名为 StudentController：

[ApiController]
[Route("[controller]")]
public class StudentController : ControllerBase
{
    private readonly IStudentDao _studentDao;

    public StudentController(IStudentDao studentDao)
    {
        _studentDao = studentDao;
    }

    [HttpGet]
    public IActionResult Get()
    {
        var students = _studentDao.GetAll();
        return Ok(students);
    }

    [HttpGet("{id}")]
    public IActionResult GetById(int id)
    {
        var student = _studentDao.GetById(id);
        if (student == null)
        {
            return NotFound();
        }
        return Ok(student);
    }

    [HttpPost]
    public IActionResult Create(Student student)
    {
        _studentDao.Create(student);
        return CreatedAtAction(nameof(GetById), new { id = student.Id }, student);
    }

    [HttpPut("{id}")]
    public IActionResult Update(int id, Student student)
    {
        var existingStudent = _studentDao.GetById(id);
        if (existingStudent == null)
        {
            return NotFound();
        }
        _studentDao.Update(student);
        return NoContent();
    }

    [HttpDelete("{id}")]
    public IActionResult Delete(int id)
    {
        var existingStudent = _studentDao.GetById(id);
        if (existingStudent == null)
        {
            return NotFound();
        }
        _studentDao.Delete(existingStudent);
        return NoContent();
    }
}

3. 创建一个数据访问对象（Data Access Object，DAO），例如，命名为 StudentDao：

public interface IStudentDao
{
    List<Student> GetAll();
    Student GetById(int id);
    void Create(Student student);
    void Update(Student student);
    void Delete(Student student);
}

public class StudentDao : IStudentDao
{
    private readonly List<Student> _students = new List<Student>();

    public StudentDao()
    {
        _students.Add(new Student { Id = 1, Name = "张三", Age = 18 });
        _students.Add(new Student { Id = 2, Name = "李四", Age = 19 });
        _students.Add(new Student { Id = 3, Name = "王五", Age = 20 });
    }

    public List<Student> GetAll()
    {
        return _students;
    }

    public Student GetById(int id)
    {
        return _students.FirstOrDefault(s => s.Id == id);
    }

    public void Create(Student student)
    {
        student.Id = _students.Max(s => s.Id) + 1;
        _students.Add(student);
    }

    public void Update(Student student)
    {
        var existingStudent = GetById(student.Id);
        existingStudent.Name = student.Name;
        existingStudent.Age = student.Age;
    }

    public void Delete(Student student)
    {
        _students.Remove(student);
    }
}

4. 在 Startup.cs 文件中注册数据访问对象（Data Access Object，DAO）：

public void ConfigureServices(IServiceCollection services)
{
    services.AddControllers();
    services.AddSingleton<IStudentDao, StudentDao>();
}

至此，您就可以使用上述代码实现 ASP.NET Core 6 中的增删改查功能了。