public abstract class JsonCreationConverter<T> : JsonConverter

    {

        /// <summary>

        /// this is very important, otherwise serialization breaks!

        /// </summary>

        public override bool CanWrite

        {

            get

            {

                return false;

            }

        }

        /// <summary>

        /// Create an instance of objectType, based properties in the JSON object

        /// </summary>

        /// <param name="objectType">type of object expected</param>

        /// <param name="jObject">contents of JSON object that will be

        /// deserialized</param>

        /// <returns></returns>

        protected abstract T Create(Type objectType, JObject jObject);

        public override bool CanConvert(Type objectType)

        {

            return typeof(T).IsAssignableFrom(objectType);

        }

        public override object ReadJson(JsonReader reader, Type objectType,

          object existingValue, JsonSerializer serializer)

        {

            if (reader.TokenType == JsonToken.Null)

                return null;

            // Load JObject from stream

            JObject jObject = JObject.Load(reader);

            // Create target object based on JObject

            T target = Create(objectType, jObject);

            // Populate the object properties

            serializer.Populate(jObject.CreateReader(), target);

            return target;

        }

        public override void WriteJson(JsonWriter writer, object value,

          JsonSerializer serializer)

        {

            throw new NotImplementedException();

        }

    }

  [JsonConverter(typeof(UserConverter))]

    public class User

    {

        private class UserConverter : JsonCreationConverter<User>

        {

            protected override User Create(Type objectType, Newtonsoft.Json.Linq.JObject jObject)

            {

                if (jObject.Property("Course") !=null)

                {

                    return new Student();

                }

                else if (jObject.Property("WorkerType") != null)

                {

                    return new Worker();

                }

                else

                {

                    return new User ();

                }

            }

        }

        public string Name { get; set; }

        public int Id { get; set; }

    }

    public class Student : User

    {

        public string Course { get; set; }

    }

    public class Worker : User

    {

        public string WorkerType { get; set; }

    }

        [Route("api/Employee/AddUsers/")]

        public void AddUsers(List<User> users)

        {

            User s = users[] as User;

            Student s1= users[] as Student;

            Worker s2 = users[] as Worker;

            s1 = users[] as Student;

            if (s1 != null)

            {

            }

            //[{"Name":"1","Id":1},{"Course":"2","Name":"2","Id":2},{"WorkerType":"3","Name":"3","Id":3}]

        }