Private setters in Json.Net

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I came here looking for the actual attribute that makes Json.NET populate a readonly property when deserializing, and that’s simply [JsonProperty], e.g.:

[JsonProperty]
public Guid? ClientId { get; private set; }

Alternative Solution

Just provide a constructor that has a parameter matching your property:

public class Foo
{
    public string Bar { get; }

    public Foo(string bar)
    {
        Bar = bar;
    }
}

Now this works:

string json = "{ \"bar\": \"Stack Overflow\" }";

var deserialized = JsonConvert.DeserializeObject<Foo>(json);
Console.WriteLine(deserialized.Bar); // Stack Overflow

I prefer this approach where possible since:

  • It doesn’t require you to decorate your properties with attributes.
  • It works with both { get; private set; } and just { get; }.

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