.Net Core WebAPI连接重置，当我在我的控制器中“包含”时

Question

I have a new project with .Net Core. It's a WebAPI project. And I have a separate project for my model.

In WebAPI project, in a controller, I have something like this:

    // GET: api/questions
    [HttpGet]
    public IEnumerable<Question> GetQuestions()
    {
        return _context.Questions
            .Include( i => i.QuestionType );
    }

When I call http://localhost:55555/api/questios/ it just returns the first record, and then this error message: Recv failure: Connection was reset

If I remove the Include part and just return the _context.Questions , it work just fine!

What's wrong in my code?

Answer 1

I've found the answer. Thank you everyone who helped.

I added json options according to Loading related data

If you are using ASP.NET Core, you can configure Json.NET to ignore cycles that it finds in the object graph. This is done in the ConfigureServices(...) method in Startup.cs.

            services.AddMvc()
              .AddJsonOptions(
                    options => options.SerializerSettings.ReferenceLoopHandling
                        = Newtonsoft.Json.ReferenceLoopHandling.Ignore );

Answer 2

Try this:

// GET: api/questions
[HttpGet]
public IEnumerable<Question> GetQuestions()
{
    var res = _context.Questions
        .Include( i => i.QuestionType ).ToArray();
    return res;
}