在.net核心中创建一个带有两个外部id键的模型类和控制器

public class MyModel
{
    public int Id { get; set; }
    public int ExternalId1 { get; set; }
    public int ExternalId2 { get; set; }
    // 其他属性
}

[Route("api/[controller]")]
[ApiController]
public class MyModelsController : ControllerBase
{
    private readonly MyDbContext _context;

    public MyModelsController(MyDbContext context)
    {
        _context = context;
    }

    // GET: api/MyModels
    [HttpGet]
    public async Task<ActionResult<IEnumerable<MyModel>>> GetMyModels()
    {
        return await _context.MyModels.ToListAsync();
    }

    // GET: api/MyModels/5
    [HttpGet("{id}")]
    public async Task<ActionResult<MyModel>> GetMyModel(int id)
    {
        var myModel = await _context.MyModels.FindAsync(id);

        if (myModel == null)
        {
            return NotFound();
        }

        return myModel;
    }

    // POST: api/MyModels
    [HttpPost]
    public async Task<ActionResult<MyModel>> PostMyModel(MyModel myModel)
    {
        _context.MyModels.Add(myModel);
        await _context.SaveChangesAsync();

        return CreatedAtAction("GetMyModel", new { id = myModel.Id }, myModel);
    }

    // PUT: api/MyModels/5
    [HttpPut("{id}")]
    public async Task<IActionResult> PutMyModel(int id, MyModel myModel)
    {
        if (id != myModel.Id)
        {
            return BadRequest();
        }

        _context.Entry(myModel).State = EntityState.Modified;

        try
        {
            await _context.SaveChangesAsync();
        }
        catch (DbUpdateConcurrencyException)
        {
            if (!MyModelExists(id))
            {
                return NotFound();
            }
            else
            {
                throw;
            }
        }

        return NoContent();
    }

    // DELETE: api/MyModels/5
    [HttpDelete("{id}")]
    public async Task<IActionResult> DeleteMyModel(int id)
    {
        var myModel = await _context.MyModels.FindAsync(id);
        if (myModel == null)
        {
            return NotFound();
        }

        _context.MyModels.Remove(myModel);
        await _context.SaveChangesAsync();

        return NoContent();
    }

    private bool MyModelExists(int id)
    {
        return _context.MyModels.Any(e => e.Id == id);
    }
}