JSON.NET Serialize Empty JSON

Question

I use MetadataTypeJson.NET to define attributes for the following type, and then serialize it using Json.NET inside the method ToString():

namespace ConsoleApp1
{
    public interface ICell
    {
        int Id { get; }
    }
    public interface IEukaryote
    {
        System.Collections.Generic.IEnumerable<ICell> Cells { get; }
        string GenericName { get; }
    }
    public sealed partial class PlantCell
        : ICell
    {
        public int Id => 12324;
    }
    public sealed partial class Plant
        : IEukaryote
    {
        private readonly System.Collections.Generic.IDictionary<string, object> _valuesDict;
        public Plant()
        {
            _valuesDict = new System.Collections.Generic.Dictionary<string, object>();
            var cells = new System.Collections.Generic.List<PlantCell>();
            cells.Add(new PlantCell());
            _valuesDict["Cells"] = cells;
            _valuesDict["GenericName"] = "HousePlant";
        }
        public System.Collections.Generic.IEnumerable<ICell> Cells => _valuesDict["Cells"] as System.Collections.Generic.IEnumerable<ICell>;
        public string GenericName => _valuesDict["GenericName"] as string;
        public int SomethingIDoNotWantSerialized => 99999;
        public override string ToString()
        {
            return Newtonsoft.Json.JsonConvert.SerializeObject(this,
                new Newtonsoft.Json.JsonSerializerSettings()
                {
                    ContractResolver = new Newtonsoft.Json.Serialization.CamelCasePropertyNamesContractResolver()
                }
            );
        }
    }
    [System.ComponentModel.DataAnnotations.MetadataType(typeof(PlantMetadata))]
    public sealed partial class Plant
    {
        [Newtonsoft.Json.JsonObject(Newtonsoft.Json.MemberSerialization.OptIn)]
        internal sealed class PlantMetadata
        {
            [Newtonsoft.Json.JsonProperty]
            public System.Collections.Generic.IEnumerable<ICell> Cells;
            [Newtonsoft.Json.JsonProperty]
            public string GenericName;
            //...
        }
    }
    class Program
    {
        static void Main(string[] args)
        {
            var plant = new Plant();
            System.Console.WriteLine(System.String.Format("Output is {0}", plant.ToString()));
            System.Console.ReadKey();
        }
    }
}

My problem is that it Plant.ToString()will return '{}'. Why is this? He worked before. The only change I made was PlantMetadatawhere I changed MemberSerializationto OptIn instead of OptOut, since I had fewer properties that I wanted to include other than those that were left behind.

Answer 1

Newtonsoft , MetadataTypeAttribute Json.NET. , , Json.NET , MetadataClassType , "" , "" . , Plant , , :

public sealed partial class Plant : IEukaryote
{
    public System.Collections.Generic.IEnumerable<ICell> Cells { get { return (_valuesDict["Cells"] as System.Collections.IEnumerable).Cast<ICell>(); } }
    public string GenericName { get { return _valuesDict["GenericName"] as string; } }
    public string FieldIWantSerialized;
    public int SomethingIDoNotWantSerialized { get { return 99999; } }

    // Remainder as before.

PlantMetadata :

//Metadata.cs
[System.ComponentModel.DataAnnotations.MetadataType(typeof(PlantMetadata))]
public sealed partial class Plant
{
    [JsonObject(MemberSerialization.OptIn)]
    internal sealed class PlantMetadata
    {
        [JsonProperty]
        public IEnumerable<ICell> Cells { get; set; }

        [JsonProperty]
        public string GenericName { get; set; }

        [JsonProperty]
        public string FieldIWantSerialized;
    }
}

Cells GenericName, FieldIWantSerialized - , .

.NET Fiddle.

, , , , MetadataClassType, -, , . PlantMetadata :

[JsonObject(MemberSerialization.OptIn)]
internal sealed class PlantMetadata
{
    [JsonProperty]
    public object Cells { get; set; }

    [JsonProperty]
    public object GenericName { get; set; }

    [JsonProperty]
    public object FieldIWantSerialized;
} 

FieldIWantSerialized , . .NET Fiddle # 2, . Newtonsoft; Microsoft :

. , .

, Newtonsoft - MetadataTypeAttribute .