Asp.net Core Razor Pages serialization not working with CamelCasePropertyNamesContractResolver in Startup.cs

Question

I'm using Asp.net Core Razor Pages and I'm returning json. I need the json to be in camel casing across the board, therefore I tried to set the resolver in Startup.cs like this

services.AddMvc()
        .AddJsonOptions(options => {
             options.SerializerSettings.ContractResolver = new CamelCasePropertyNamesContractResolver();
        });

However this does not work, the razor page is still returning json in Pascal casing. How do I correct the issue? Thank you.

Answer 1

When you use AddJsonOptions, you are configuring an instance of JsonSerializerSettings that is specific to ASP.NET Core MVC. When you use JsonConvert.SerializeObject, you're using a different instance of JsonSerializerSettings. In order to affect that instance, you can use JsonConvert.DefaultSettings, like so:

JsonConvert.DefaultSettings = () => new JsonSerializerSettings
{
    ContractResolver = new CamelCasePropertyNamesContractResolver()
};

Unfortunately, changes you make to DefaultSettings do not apply to the instance that's configured via AddJsonOptions - You'll need to configure those separately. You can see how that is a separate instance that gets created by a JsonSerializerSettingsProvider in the source, if you're interested.