Reference Loop Handling Ignore not working on Asp.Net Core 3.0 Preview 3

Question

I have been beating my head against a wall with this one, trying to find out why it won't work. I haven't been able to find anything on why it won't work, so I am asking here.

I have a console application that is running on Asp.Net Core 3.0 Preview 3.

On this project I am getting a Json loop problem, which I know I can fix with setting the Reference Loop Handling in Startup to Ignore. However, I could only find information on setting it inside the .AddJsonOptions(), which doesn't appear to be in Asp.Net Core 3.0.

I went to the documentation for how to migrate from 2.1 to 3.0 and I found this

Even after changing my code accordingly

services.AddMvc()
     .AddNewtonsoftJson(
          options => { options.SerializerSettings.ReferenceLoopHandling = ReferenceLoopHandling.Ignore; }
      );

I still get an error saying: "Self referencing loop detected for property '[insert class name]' with type '[model name]'."

Where else can I set Json to ignore the loop reference?

Or what can I do to make this work?

Thank you in advanced

Have you tried doing the serialization explicitly, i.e serialize the object/data in a method or in your controller action. like so JsonConvert.SerializeObject(object, new JsonSerializerSettings().ReferenceLoopHandling = ReferenceLoopHandling.Ignore) I believe this will take precedence over what you have in your startup.cs class — Ugo Okoro
– Ugo Okoro, Commented Mar 19, 2019 at 17:29
FWIW, this type of thing generally becomes a non-issue if you use proper DTOs, instead of things like entity classes directly. With a DTO class(es), you can remove the reference loop entirely from the equation. — Chris Pratt
– Chris Pratt, Commented Mar 19, 2019 at 17:34
Thanks all of you, UgoOkoro that works thank you. However, I am going to go for creating DTOs like ChrisPratt said that should make this a non-issue. I had briefly thought about doing something like DTOs, but I didn't know there was a name for it and everything. Thank you guys. — DalTron
– DalTron, Commented Mar 20, 2019 at 19:03

Filipe Madureira · Accepted Answer · 2019-12-12 10:34:58Z

6

As explained in detail here as part of ASP.NET Core 3.0, the team moved away from including Newtonsoft.Json by default.

You probably need to install Microsoft.AspNetCore.Mvc.NewtonsoftJson and use (note, I'm using .AddNewtonsoftJson() chained with .AddControllers()) something similar:

services.AddControllers()
    .AddNewtonsoftJson(x =>
            {
                x.SerializerSettings.ReferenceLoopHandling = ReferenceLoopHandling.Ignore;
            });

answered Dec 12, 2019 at 10:34

Filipe Madureira

4505 silver badges17 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

Sato · Accepted Answer · 2019-10-20 16:40:11Z

5

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

https://learn.microsoft.com/en-us/aspnet/core/migration/22-to-30?view=aspnetcore-3.0&tabs=visual-studio#jsonnet-support

answered Oct 20, 2019 at 16:40

Sato

511 silver badge6 bronze badges

Collectives™ on Stack Overflow

Reference Loop Handling Ignore not working on Asp.Net Core 3.0 Preview 3

2 Answers 2

Comments

Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related