Serialize only interface properties to JSON with Json.net

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The method I use,

public class InterfaceContractResolver : DefaultContractResolver
{
    private readonly Type _InterfaceType;
    public InterfaceContractResolver (Type InterfaceType)
    {
        _InterfaceType = InterfaceType;
    }

    protected override IList<JsonProperty> CreateProperties(Type type, MemberSerialization memberSerialization)
    {
        //IList<JsonProperty> properties = base.CreateProperties(type, memberSerialization);
        IList<JsonProperty> properties = base.CreateProperties(_InterfaceType, memberSerialization);
        return properties;
    }
}

// To serialize do this:
var settings = new JsonSerializerSettings() {
     ContractResolver = new InterfaceContractResolver (typeof(IThing))
};
string json = JsonConvert.SerializeObject(theObjToSerialize, settings);

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