Add a custom attribute to json.net

Question

JSON.NET comes with property attributes like [JsonIgnore] and [JsonProperty].

I want to create some custom ones that get run when the seria

Answer 1

You can write a custom contract resolver like this

public class MyContractResolver : Newtonsoft.Json.Serialization.DefaultContractResolver 
                                        where T : Attribute
{
    Type _AttributeToIgnore = null;

    public MyContractResolver()
    {
        _AttributeToIgnore = typeof(T);
    }

    protected override IList CreateProperties(Type type, MemberSerialization memberSerialization)
    {
        var list =  type.GetProperties()
                    .Where(x => !x.GetCustomAttributes().Any(a => a.GetType() == _AttributeToIgnore))
                    .Select(p => new JsonProperty()
                    {
                        PropertyName = p.Name,
                        PropertyType = p.PropertyType,
                        Readable = true,
                        Writable = true,
                        ValueProvider = base.CreateMemberValueProvider(p)
                    }).ToList();

        return list;
    }
}

You can use it in serialization/deserialization like

var json = JsonConvert.SerializeObject(
            obj, 
            new JsonSerializerSettings() {
                ContractResolver = new MyContractResolver()
            });

var obj = JsonConvert.DeserializeObject(
            json, 
            new JsonSerializerSettings() {
                ContractResolver = new MyContractResolver()
            });