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Editorial Team
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Asked: 2026-06-03T13:05:05+00:00

Json.Net has no problem serializing an overridden property in a child class. public override

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Json.Net has no problem serializing an overridden property in a child class. 

public override ICollection<Person> Persons { get; set; }

But if I try to use new on the property, the serialization fails. There’s no exception; Persons are just never serialized. 

public new ICollection<Person> Persons { get; set; }

Why is this?

(This example doesn’t make much sense, I know. It’s only an example. The goal later is to be able to change datatype of the property public new ICollection<PersonDto> Persons { get; set; })

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1 Answer

  1. Editorial Team

    I discovered a simpler way to solved this without having to create a custom JsonConverter

    If you put the attribute JsonProperty over the property it works. 

    [JsonProperty]
public new ICollection<PersonDto> Persons { get; set; }

    I don’t know why Json.Net needs the attribute here. Normally it serializes everything that isn’t decorated with JsonIgnore. If someone knows, you’re welcome to drop a comment.

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