ASP.net 5 Web API Post CreatedAtRoute always returns 500 Internal Server Error

Question

The database is running. It really inserts a new record, but when I use CreateAtRoute (), I always get 500 back from the client. Why?

My controller Get:

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

I tried to debug this. Yes, it will return an HttpBadRequest if the ingredient I'm trying to insert already exists.

I tried to set a breakpoint inside the catch block and I am not getting there, so I assume there were no errors in the database.

The record will be inserted into the database. I get to the line return CreatedAtRoute(...); but getting 500 back. (I also set a breakpoint there).

Now I am using a violinist. My request is as follows:

 POST /api/ingredient HTTP/1.1 Host: localhost:55303 Content-Type: application/json;charset=utf-8 {"id":0, "name": "rosemary", "description": "rosemary"} 

I also removed the double quotes in the property names, and I still get the same 500.

I have a camel body allowed at startup:

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

I think I showed all the relevant code. If you need more, please let me know.

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UPDATE

CreatedAtRoute has an overload with three parameters:

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

The last parameter is an object that you can create dynamically or transfer your entire object depending on what you want to open.

It is strange, as there is a 2-parameter variant, which will lead to a strange answer of 500.