CamelCase only if PropertyName not explicitly set in Json.Net?

Question

I'm using Json.Net for my website. I want the serializer to serialize property names in camelcase by default. I don't want it to change property names that I manually assign. I have the following code:

public class TestClass
{
    public string NormalProperty { get; set; }

    [JsonProperty(PropertyName = "CustomName")]
    public string ConfiguredProperty { get; set; }
}

public void Experiment()
{
    var data = new TestClass { NormalProperty = null, 
        ConfiguredProperty = null };

    var result = JsonConvert.SerializeObject(data,
        Formatting.None,
        new JsonSerializerSettings {ContractResolver
            = new CamelCasePropertyNamesContractResolver()}
        );
    Console.Write(result);
}

The output from Experiment is:

{"normalProperty":null,"customName":null}

However, I want the output to be:

{"normalProperty":null,"CustomName":null}

Is this possible to achieve?

don't use CamelCasePropertyNamesContractResolver and use JsonProperty only. — L.B
– L.B, Commented Oct 5, 2012 at 15:26
@L.B If I only use JsonProperty, the default naming will be PascalCase, so normalProperty will instead be NormalProperty in the JSON. — Oliver
– Oliver, Commented Oct 5, 2012 at 16:53
Oliver No, It is serialized exactly as what you give in JsonProperty. — L.B
– L.B, Commented Oct 5, 2012 at 16:58
@L.B If there is no JsonProperty, it is serialized as NormalProperty. If I need to serialize a class that has 20 PascalCase properties, I don't want to have to write a JsonProperty for each of them to meet javascript naming conventions. It is needless effort. — Oliver
– Oliver, Commented Oct 5, 2012 at 19:43
The code above works for me without any modifications using version 7.0.1 of Newtonsoft.Json, so I think this may have been a bug that was fixed. — Big McLargeHuge
– Big McLargeHuge, Commented Oct 16, 2015 at 18:41

Oliver · Accepted Answer · 2012-10-08 10:54:09Z

21

You can override the CamelCasePropertyNamesContractResolver class like this:

class CamelCase : CamelCasePropertyNamesContractResolver
{
    protected override JsonProperty CreateProperty(MemberInfo member,
        MemberSerialization memberSerialization)
    {
        var res = base.CreateProperty(member, memberSerialization);

        var attrs = member
            .GetCustomAttributes(typeof(JsonPropertyAttribute),true);
        if (attrs.Any())
        {
            var attr = (attrs[0] as JsonPropertyAttribute);
            if (res.PropertyName != null)
                res.PropertyName = attr.PropertyName;
        }

        return res;
    }
}

answered Oct 8, 2012 at 10:54

Oliver

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1 Comment

Matt Burland Over a year ago

One slight improvement if (res.PropertyName != null && attr.PropertyName != null) Doing this allows you to set a JsonProperty attribute on a field without a name and still have it handled with regular camel casing. Useful if you want to just set something like [JsonProperty(NullValueHandling = NullValueHandling.Ignore)]

hultqvist · Accepted Answer · 2018-05-22 12:05:57Z

2

With the introduction of NamingStrategy it's easier.
As a bonus you can get it to not modify dictionary keys.

class MyContractResolver : CamelCasePropertyNamesContractResolver
{
    public MyContractResolver()
    {
        NamingStrategy.OverrideSpecifiedNames = false;    //Overriden
        NamingStrategy.ProcessDictionaryKeys = false;     //Overriden
        NamingStrategy.ProcessExtensionDataNames = false; //default
    }
}

answered May 22, 2018 at 12:05

hultqvist

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