using System;

using System.Linq;

using System.Collections.Generic;

using Newtonsoft.Json.Linq;

​

public class Program

{

    private static readonly string[] _requiredProperties = { "a", "b" };

    public static void Main()

    {

        Console.WriteLine("Test single");

        var j = JObject.Parse("{\"a\":\"1\",\"b\":\"2\",\"c\":{\"d\":\"4\"}}");

        foreach (var p in Test(j))

            Console.WriteLine(p);

        Console.WriteLine("Test multiple");

        j = JObject.Parse("{\"a\":\"1\",\"b\":\"2\",\"c\":[{\"d\":\"4\"},{\"e\":\"5\"}]}");

        foreach (var p in Test(j))

            Console.WriteLine(p);

        Console.WriteLine("Test invalid");

        j = JObject.Parse("{\"a\":\"1\",\"b\":\"2\",\"c\":[{\"d\":\"4\"},{\"e\":\"5\"}],\"f\":{\"g\":\"7\"}}");

        foreach (var p in Test(j))

            Console.WriteLine(p);

    }

    public static IEnumerable<JObject> CreatePackets(JObject json) {

        JProperty single = null;

        try {

            single = json.Properties().Where(a=>!_requiredProperties.Contains(a.Name)).Single();

        } catch (InvalidOperationException i) {

            throw new Exception(i.Message.Contains("no ele") ? "No workflow rule data found!" : "Multiple workflow rule data found");

        }

        JObject _l_Enrich(JObject o) {

            foreach (var prop in _requiredProperties)

                o.Add(prop, json[prop]);

            return o;

        }

        if (single.Value is JObject)

            yield return _l_Enrich((JObject)single.Value);

        else //is JArray     

            foreach (JObject p in single.Value)

                yield return _l_Enrich(p);

    }

}