c# - Json.NET Serialize private members and not readonly properties

Question

How can I customize Json.NET to serialize private members and NOT serialize public readonly properties (without using attributes).

I've had a stab around at creating a custom IContractResolver but am a bit lost.

Answer 1

For a partial answer, messing with DefaultContractResolver.DefaultMembersSearchFlags can get it to include private things:

Newtonsoft.Json.JsonSerializerSettings jss = new Newtonsoft.Json.JsonSerializerSettings();

if (includePrivateMembers)
{
    Newtonsoft.Json.Serialization.DefaultContractResolver dcr = new Newtonsoft.Json.Serialization.DefaultContractResolver();
    dcr.DefaultMembersSearchFlags |= System.Reflection.BindingFlags.NonPublic;
    jss.ContractResolver = dcr;
}

return Newtonsoft.Json.JsonConvert.SerializeObject(o, jss);

Seems to work on a lot of objects, though with some this seems to generate a CLR exception.