ASP.net 5 Web API Post CreatedAtRoute始终返回500内部服务器错误

数据库有效.它实际上插入了新记录,但是当我使用CreatedAtRoute()时,我总是从客户端获得500回.为什么？

我的控制器获取:

[Route("api/[controller]")]
public class IngredientController : Controller
{
    private SimpleCookbookDbContext db { get; set; }

    public IngredientController(SimpleCookbookDbContext context)
    {
        db = context;
    }

    // GET: api/values
    [HttpGet]
    public async Task> Get()
    {
        return await db.Ingredients.ToListAsync();
    }

    // GET api/values/5
    [HttpGet("{id}", Name = "GetIngredient")]
    public async Task Get(int id)
    {
        return await db.Ingredients.SingleOrDefaultAsync(i => i.Id == id);
    }

    [HttpPost]
    public async Task Post([FromBody]Ingredient ingredient)
    {
        try
        {

            var res = await IM.CreateAsync(ingredient);

            if (!res.Success)
            {
                return HttpBadRequest(res.Errors);
            }

        }
        catch(Exception)
        {
            return new HttpStatusCodeResult((int)HttpStatusCode.InternalServerError);
        }


        return CreatedAtRoute("GetIngredient", new { controller="Ingredient", id = ingredient.Id });
    }
}

POST /api/ingredient HTTP/1.1
Host: localhost:55303
Content-Type: application/json;charset=utf-8

{"id":0, "name": "rosemary", "description": "rosemary"}

services.AddMvc().AddJsonOptions(options => {
                options.SerializerSettings.ContractResolver = new CamelCasePropertyNamesContractResolver();
            });

return CreatedAtRoute("GetIngredient", new { controller="Ingredient", id = ingredient.Id }, ingredient);