JsonIgnore attributes not working in ASP.NET?

Question

I've got an object in my project with circular references. I've put [JsonIgnore] above the field like so:

    [JsonIgnore]     public virtual Foobar ChildObject { get; set; } 

I'm still getting circular reference errors when I serialize the object. The only fields that do not have JsonIgnore are string fields and should not cause this. Is there something else I need to do to get JsonIgnore to work?

Thanks!

Answer 1

I had incorrectly resolved the JsonIgnore reference.

Note that this attribute exists in more than one namespace:

• System.Text.Json.Serialization
• Newtonsoft.Json

I had resolved this in VS to System.Text.Json.Serialization.JsonIgnore - however I was using the Newtonsoft library for my actual Serialise/Deserialise - and hence the attribute was ignored. Changing the reference to Newtonsoft.Json.JsonIgnore resolved.