ASP.NET Development MVC

ASP.Net Core 2.2 – separate serializer settings for input and output

ASP.Net Core 2.2 allows to set serializer settings using MvcJsonOptions.SerializerSettings property. The problem is that it affects both input and output. Is there a way to have separate options for input (deserialization) and output (serialization)? In particular, I need to set a different behavior for NullValueHandling settings: ignore null errors for non-nullable fields when deserializing client json but keep nulls for defined model fields when serializing the result.

For example, I have a C# model for request:

public class SomeEntity
    public int Id { get; set; }
    public int? ParentId { get; set; }
    public string Name { get; set; }

And input JSON: { id: null, parentId: null, name: "test" }. The deserialization fails for NullValueHandling.Include but works for NullValueHandling.Ignore.

But when I serialize an entity like this one

new SomeEntity
    Id = 1,
    ParentId = null,
    Name = "test"

It keeps null with NullValueHandling.Include: { id: 1, parentId: null, name: "test" } but erases it with NullValueHandling.Ignore: { id: 1, name: "test" }.

I need to achieve the “Ignore” scenario for input and “Include” for output.

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