public class KeysJsonConverter : JsonConverter
{
private readonly Type[] _types;
public KeysJsonConverter(params Type[] types)
{
_types = types;
}
public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
{
JToken t = JToken.FromObject(value);
if (t.Type != JTokenType.Object)
{
t.WriteTo(writer);
}
else
{
JObject o = (JObject)t;
IList<string> propertyNames = o.Properties().Select(p => p.Name).ToList();
o.AddFirst(new JProperty("Keys", new JArray(propertyNames)));
o.WriteTo(writer);
}
}
public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
{
throw new NotImplementedException("Unnecessary because CanRead is false. The type will skip the converter.");
}
public override bool CanRead
{
get { return false; }
}
public override bool CanConvert(Type objectType)
{
return _types.Any(t => t == objectType);
}
}
public class Employee
{
public string FirstName { get; set; }
public string LastName { get; set; }
public IList<string> Roles { get; set; }
}