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Asked: 2020-10-26 07:39:43 +0800 CST 2020-10-26 07:39:43 +0800 CST

MVC project without WebApiConfig class to place json configuration

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I have several Classes generated by the entity framework and they need to be serialized like this;

 string OldVersion = JsonConvert.SerializeObject(foo);

but I get the message:

Self referencing loop detected with type 'System.Data.Entity.DynamicProxies

I have consulted and found that there must be a WebApiConfig class that does not exist in the project that I am modifying, and place the following lines of code to avoid the error

 var jsonFormatter = config.Formatters.OfType<JsonMediaTypeFormatter>().First();
    jsonFormatter.SerializerSettings.ContractResolver = new CamelCasePropertyNamesContractResolver();

Is there another way to add those lines directly in the web.config or another way to avoid this error?

I use Newtonsoft.json

c#

1 Answers

  1. Best Answer

    It uses the method overloadSerializeObject to tell it the serialization options.

    It would be something like this:

            JsonConvert.SerializeObject(foo, Formatting.Indented,
            new JsonSerializerSettings()
            {
                ReferenceLoopHandling = Newtonsoft.Json.ReferenceLoopHandling.Ignore
            }
        );

    If you want to do it globally (that is, for the entire application), you can configure it in the method Application_Start()of the Global.asax.

    It would be something like this:

        protected void Application_Start()
    {
        ...

        JsonConvert.DefaultSettings = () => new JsonSerializerSettings
        {
            Formatting = Newtonsoft.Json.Formatting.Indented,
            ReferenceLoopHandling = Newtonsoft.Json.ReferenceLoopHandling.Ignore
        };
    }
    • 2