Self referencing loop detected in ASP.NET Core [duplicate]

Question

When I try to serialize some domain objects using ASP.NET Core Newsoft JSON.NET it is throwing an exception because it is detecting a self referencing loop.

In ASP.NET 4 we used to fix it globally this way: JSON.NET Error Self referencing loop detected for type

How can we fix this in ASP.NET Core?

You might have a look at my answer on “Self Referencing Loop Detected” exception with JSON.Net page. — Murat Yıldız
– Murat Yıldız, Commented Jul 8, 2018 at 20:36
The "duplicate" question is only a partial duplicate, since it doesn't refer to the particularities of integrating this in ASP.NET Core. As the accepted answer says, things have changed in Core so the answer of the "duplicate" question wouldn't work. — Vlad Iliescu
– Vlad Iliescu, Commented Aug 9, 2018 at 9:06

Nkosi · Accepted Answer · 2017-05-29 23:01:15Z

109

There is no difference in the way self-referencing loops are handled in ASP.NET 4 compared to ASP.NET Core (previously Asp.Net 5). The principles outlined in the question you referenced in your post still apply. However, setting this property in ASP.NET Core is obviously slightly different, given the new method of configuring and bootstrapping the app:

public void ConfigureServices(IServiceCollection services)
{
    services.AddMvc().AddJsonOptions(options => {
        options.SerializerSettings.ContractResolver = new CamelCasePropertyNamesContractResolver();
        options.SerializerSettings.ReferenceLoopHandling = ReferenceLoopHandling.Ignore;
    });
    services.AddEntityFramework().AddSqlServer().AddDbContext<IvoryPacketDbContext>(
        options => options.UseSqlServer(Configuration["Data:DefaultConnection:ConnectionString"])
    );
}

edited May 29, 2017 at 23:01

Nkosi

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answered Jan 18, 2016 at 4:23

Blake Mumford

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7 Comments

Daniel Over a year ago

to be clear, only the "ReferenceLoopHandling" line is required to resolve this issue.

Pablo Recalde Over a year ago

Before I found this solution, I tried to use that setting on the property that was causing issues, as an attribute [JsonProperty(ReferenceLoopHandling=ReferenceLoopHandling.Ignore)] but it had no effect. Can anyone explain why this solution didn't work in the first place?

Diego Over a year ago

HI.. it does not work for me neither.. I only had to add "[JsonObject(IsReference = true)] " as a header on the class that gave me error and Works fine.

saviour123 Over a year ago

Decorating the property with [JsonIgnore] solved it for me

Hamza Dahmoun Over a year ago

you can avoid the self reference possibility by selecting only fields you need and exclude the fields that generate the reference looping

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