How to serialize only inherited properties of a class using a JsonConverter

Question

I\'m trying to serialize only the inherited properties of a class using json.net. I\'m aware of the [JsonIgnore] attribute, but I only want to do ignore them on certain occa

Answer 1

Not sure why your code doesn't work (maybe a Json.NET bug?). Instead, you can remove the properties you don't want from the JObject and write the entire thing in one call:

    public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
    {
        // Find properties of inherited class
        var classType = value.GetType();
        var classProps = classType.GetProperties(BindingFlags.DeclaredOnly | BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic).ToList();

        // Remove the overrided properties
        classProps.RemoveAll(t =>
        {
            var getMethod = t.GetGetMethod(false);
            return (getMethod.GetBaseDefinition() != getMethod);
        });

        // Get json data
        var o = (JObject)JToken.FromObject(value);

        // Remove all base properties
        foreach (var p in o.Properties().Where(p => !classProps.Select(t => t.Name).Contains(p.Name)).ToList())
            p.Remove();

        o.WriteTo(writer);
    }

Alternatively, you could create your own contract resolver and filter out base properties and members:

public class EverythingButBaseContractResolver : DefaultContractResolver
{
    protected override JsonProperty CreateProperty(MemberInfo member, MemberSerialization memberSerialization)
    {
        if (member.ReflectedType != member.DeclaringType)
            return null;
        if (member is PropertyInfo)
        {
            var getMethod = ((PropertyInfo)member).GetGetMethod(false);
            if (getMethod.GetBaseDefinition() != getMethod)
                return null;
        }
        var property = base.CreateProperty(member, memberSerialization);
        return property;
    }
}

And then use it like:

        var settings = new JsonSerializerSettings { ContractResolver = new EverythingButBaseContractResolver() };
        var json = JsonConvert.SerializeObject(rootObject, Formatting.Indented, settings);